Kinase inhibitors for advanced medullary thyroid carcinoma

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Persistence or early hyperparathyroidism recurrence may occur if surgery is guided solely by ioPTH." ] ] ] "autores" => array:1 [ 0 => array:2 [ "autoresLista" => "Fabio Luiz de Menezes Montenegro, Delmar Muniz Lourenço, Marcos Roberto Tavares, Sergio Samir Arap, Climerio Pereira Nascimento, Ledo Mazzei Massoni Neto, André D'Alessandro, Rodrigo Almeida Toledo, Flávia Lima Coutinho, Lenine Garcia Brandão, Gilberto de Britto e Silva Filho, Anói Castro Cordeiro, Sergio Pereira Almeida Toledo" "autores" => array:13 [ 0 => array:2 [ "nombre" => "Fabio Luiz" "apellidos" => "de Menezes Montenegro" ] 1 => array:3 [ "nombre" => "Delmar Muniz" "apellidos" => "Lourenço" "sufijo" => "Jr" ] 2 => array:2 [ "nombre" => "Marcos Roberto" "apellidos" => "Tavares" ] 3 => array:2 [ "nombre" => "Sergio Samir" "apellidos" => "Arap" ] 4 => array:3 [ "nombre" => "Climerio Pereira" "apellidos" => "Nascimento" "sufijo" => "Jr" ] 5 => array:2 [ "nombre" => "Ledo Mazzei Massoni" "apellidos" => "Neto" ] 6 => array:2 [ "nombre" => "André" "apellidos" => "D'Alessandro" ] 7 => array:2 [ "nombre" => "Rodrigo Almeida" "apellidos" => "Toledo" ] 8 => array:2 [ "nombre" => "Flávia Lima" "apellidos" => "Coutinho" ] 9 => array:2 [ "nombre" => "Lenine Garcia" "apellidos" => "Brandão" ] 10 => array:2 [ "nombre" => "Gilberto" "apellidos" => "de Britto e Silva Filho" ] 11 => array:2 [ "nombre" => "Anói Castro" "apellidos" => "Cordeiro" ] 12 => array:2 [ "nombre" => "Sergio Pereira Almeida" "apellidos" => "Toledo" ] ] ] ] ] "idiomaDefecto" => "en" "EPUB" => "https://multimedia.elsevier.es/PublicationsMultimediaV1/item/epub/S1807593222024085?idApp=UINPBA00004N" "url" => "/18075932/00000067000000S1/v1_202212010649/S1807593222024085/v1_202212010649/en/main.assets" ] "itemAnterior" => array:19 [ "pii" => "S1807593222024061" "issn" => "18075932" "doi" => "10.6061/clinics/2012(Sup01)20" "estado" => "S300" "fechaPublicacion" => "2012-04-01" "aid" => "2406" "copyright" => "CLINICS" "documento" => "article" "crossmark" => 0 "licencia" => "https://creativecommons.org/licenses/by-nc/3.0/" "subdocumento" => "rev" "cita" => "Clinics. 2012;67 Supl 1:119-23" "abierto" => array:3 [ "ES" => true "ES2" => true "LATM" => true ] "gratuito" => true "lecturas" => array:1 [ "total" => 0 ] "en" => array:11 [ "idiomaDefecto" => true "cabecera" => "REVIEW" "titulo" => "Temozolomide in aggressive pituitary adenomas and carcinomas" "tienePdf" => "en" "tieneTextoCompleto" => "en" "tieneResumen" => "en" "paginas" => array:1 [ 0 => array:2 [ "paginaInicial" => "119" "paginaFinal" => "123" ] ] "contieneResumen" => array:1 [ "en" => true ] "contieneTextoCompleto" => array:1 [ "en" => true ] "contienePdf" => array:1 [ "en" => true ] "autores" => array:1 [ 0 => array:2 [ "autoresLista" => "Leon D. Ortiz, Luis V. Syro, Bernd W. Scheithauer, Fabio Rotondo, Humberto Uribe, Camilo E. Fadul, Eva Horvath, Kalman Kovacs" "autores" => array:8 [ 0 => array:2 [ "nombre" => "Leon D." "apellidos" => "Ortiz" ] 1 => array:2 [ "nombre" => "Luis V." "apellidos" => "Syro" ] 2 => array:3 [ "nombre" => "Bernd W." "apellidos" => "Scheithauer" "sufijo" => "(in memoriam)" ] 3 => array:2 [ "nombre" => "Fabio" "apellidos" => "Rotondo" ] 4 => array:2 [ "nombre" => "Humberto" "apellidos" => "Uribe" ] 5 => array:2 [ "nombre" => "Camilo E." "apellidos" => "Fadul" ] 6 => array:2 [ "nombre" => "Eva" "apellidos" => "Horvath" ] 7 => array:2 [ "nombre" => "Kalman" "apellidos" => "Kovacs" ] ] ] ] ] "idiomaDefecto" => "en" "EPUB" => "https://multimedia.elsevier.es/PublicationsMultimediaV1/item/epub/S1807593222024061?idApp=UINPBA00004N" "url" => "/18075932/00000067000000S1/v1_202212010649/S1807593222024061/v1_202212010649/en/main.assets" ] "en" => array:16 [ "idiomaDefecto" => true "cabecera" => "REVIEW" "titulo" => "Kinase inhibitors for advanced medullary thyroid carcinoma" "tieneTextoCompleto" => true "paginas" => array:1 [ 0 => array:2 [ "paginaInicial" => "125" "paginaFinal" => "129" ] ] "autores" => array:1 [ 0 => array:4 [ "autoresLista" => "Martin Schlumberger, Marie-Hélène Massicotte, Camila L. Nascimento, Cécile Chougnet, Eric Baudin, Sophie Leboulleux" "autores" => array:6 [ 0 => array:4 [ "nombre" => "Martin" "apellidos" => "Schlumberger" "email" => array:1 [ 0 => "schlumbg@igr.fr" ] "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "*" "identificador" => "cor1" ] ] ] 1 => array:2 [ "nombre" => "Marie-Hélène" "apellidos" => "Massicotte" ] 2 => array:2 [ "nombre" => "Camila L." "apellidos" => "Nascimento" ] 3 => array:2 [ "nombre" => "Cécile" "apellidos" => "Chougnet" ] 4 => array:2 [ "nombre" => "Eric" "apellidos" => "Baudin" ] 5 => array:2 [ "nombre" => "Sophie" "apellidos" => "Leboulleux" ] ] "afiliaciones" => array:1 [ 0 => array:2 [ "entidad" => "University Paris-Sud XI, Institut Gustave Roussy, Department of Nuclear Medicine and Endocrine Oncology, Centre de Référence “Tumeurs Réfractaires de la Thyroïde”, Villejuif, France." "identificador" => "aff1" ] ] "correspondencia" => array:1 [ 0 => array:3 [ "identificador" => "cor1" "etiqueta" => "*" "correspondencia" => "Tel.: 33142116095" ] ] ] ] "textoCompleto" => "INTRODUCTIONMedullary thyroid carcinoma (MTC) accounts for 5–8% of all thyroid cancers (<a class="elsevierStyleCrossRef" href="#bib1">1</a>),(<a class="elsevierStyleCrossRef" href="#bib2">2</a>). Distant metastases are observed at presentation in 7–23% of MTC patients. In patients with elevated calcitonin levels after initial treatment, clinical recurrence will occur at different time intervals after surgery, depending on the amount of persistent disease and the progression rate. Recurrent disease in the neck and mediastinum is frequently amenable to surgery, and some patients may also benefit from external radiation therapy. Distant metastases are the main cause of MTC-related death. They often affect multiple organs, including lungs, bones, and liver, and more rarely brain, skin, and breast, and they are frequently associated with a neck recurrence (<a class="elsevierStyleCrossRef" href="#bib3">3</a>). In patients with recurrent disease, a good quality of life is usually maintained, but diarrhea may be debilitating. Slow tumor growth is common and, in retrospective series, survival after the discovery of distant metastases was around 25% at 5 years and 10% at 10 years, but recent series suggest that survival rates might be higher with earlier discovery of metastatic disease.Selection of patients for clinical trialsPatients with metastatic MTC must be accurately characterized concerning all clinical prognostic indicators, including age, performance status, histology, disease extent and location, and progression rate. The importance of this latter parameter cannot be overemphasized, as many patients with metastatic MTC can be asymptomatically stable for long periods of time, and in such patients, the benefits of novel therapies may be largely outweighed by drug toxicities and the rigors of clinical trial participation. Also, there is no evidence that the efficacy of these novel therapies is higher at an early stage than later when metastases are larger in size, and treatment can be postponed in most patients until progression has been documented by imaging.Imaging should emphasize identification of all clinically relevant sites of disease, including tumors large enough to be serially assessed to determine response to therapy as well as those that might require additional localized intervention, such as surgery, external radiation therapy, radiofrequency ablation, cryotherapy, cement injection, or embolization. These treatments should be performed whenever needed before the initiation of any systemic treatment, and they may enable systemic treatment to be postponed in some patients.Diagnostic procedures in metastatic MTC patients should include spiral computed tomographic scanning or magnetic resonance imaging of the brain, ultrasonography of the neck, contrast-enhanced spiral computed tomographic scanning of the neck and chest, triple-phase computed tomographic scanning or preferably magnetic resonance imaging of the liver (because liver metastases may be difficult to visualize with computed tomography during anti-angiogenic treatment), bone scintigraphy and magnetic resonance imaging of the spine and pelvis. Fluorodeoxyglucose (FDG) uptake on positron emission tomography scanning is usually low, and for this reason FDG positron emission tomography scanning is usually poorly sensitive and cannot be used to assess progression rate or response to treatment (<a class="elsevierStyleCrossRef" href="#bib1">1</a>),(<a class="elsevierStyleCrossRef" href="#bib3">3</a>).In the absence of treatment, imaging is repeated every six months, and progression rate is assessed using Response Evaluation Criteria in Solid Tumor (RECIST) (<a class="elsevierStyleCrossRef" href="#bib4">4</a>),(<a class="elsevierStyleCrossRef" href="#bib5">5</a>). Patients with measurable lesions and documented progression in a given time interval (between 6 and 15 months) should be considered candidates for systemic treatment. Progression rate can also be evaluated by the doubling times of serum markers, calcitonin and carcinoembryonic antigen levels (<a class="elsevierStyleCrossRef" href="#bib6">6</a>),(<a class="elsevierStyleCrossRef" href="#bib7">7</a>), but progression should always be confirmed by imaging (<a class="elsevierStyleCrossRef" href="#bib4">4</a>),(<a class="elsevierStyleCrossRef" href="#bib5">5</a>).Standard Systemic TreatmentsSymptomatic treatments of diarrhea include loperamide, diphenoxylate/atropine, and codeine (<a class="elsevierStyleCrossRef" href="#bib1">1</a>). Earlier clinical trials of cytotoxic chemotherapies suffered many shortcomings. Due to both the rarity of apparent benefit and the significant toxicity of the treatments, physicians enrolled only patients with a large tumor burden and rapidly progressive metastatic disease. The few prospective trials that were reported did not include sufficient numbers of patients to demonstrate benefits or reject false-negative conclusions. None used the now-standard RECIST (<a class="elsevierStyleCrossRef" href="#bib4">4</a>),(<a class="elsevierStyleCrossRef" href="#bib5">5</a>), and many trials reported results mixing together patients with differentiated thyroid cancer, MTC and anaplastic thyroid cancer. The most frequently tested agent in thyroid cancer patients is doxorubicin, used either alone or in combination with cisplatin. Tumor response rates range from 0% to 22% in MTC patients, with all responses being partial and only lasting a few months (<a class="elsevierStyleCrossRef" href="#bib8">8</a>),(<a class="elsevierStyleCrossRef" href="#bib9">9</a>). As MTC is a well-differentiated endocrine tumor, various combinations of 5′-fluorouracil, dacarbazine, streptozocin, cyclophosphamide, and vincristine have been used and produced some responses (in about 20% of patients) with symptomatic improvement in some (<a class="elsevierStyleCrossRef" href="#bib10">10</a>). Newer cytotoxic drugs, such as taxanes, gemcitabine, or irinotecan, have not been reported in significant series of MTC patients.Treatment with bi-specific antibodies directed against carcinoembryonic antigen and diethylene triamine pentaacetic acid (DTPA) and with DTPA labeled with 13I or with octreotide labeled with yttrium-90 prolonged overall survival but did not induce objective responses in patients with large metastases (<a class="elsevierStyleCrossRef" href="#bib11">11</a>),(<a class="elsevierStyleCrossRef" href="#bib12">12</a>), and hematological and renal toxicities were significant. Interferon α and somatostatin analogs used either alone or in combination in MTC patients only produced an inconstant and transient effect on diarrhea. Dendritic cell immunotherapy may be effective but is still under evaluation (<a class="elsevierStyleCrossRef" href="#bib13">13</a>).In conclusion, these therapeutic methods provide low response rates in patients with advanced and progressive refractory MTC.Molecular Targeted TherapiesSeveral molecular abnormalities thought to be important in thyroid oncogenesis and/or progression have been defined in MTC and represent potential targets for therapy (<a class="elsevierStyleCrossRef" href="#bib1">1</a>),(<a class="elsevierStyleCrossRef" href="#bib2">2</a>),(<a class="elsevierStyleCrossRef" href="#bib14">14</a>). The aims of treatments are first to improve the quality of life and second to prolong overall survival. Because it is difficult to demonstrate an improvement in overall survival in patients with slowly progressing disease and a long life expectancy, surrogate parameters have been used: the response rate studied in phase II trials is poorly related to overall survival; progression-free survival studied in randomized phase III trials is better related to overall survival. At the present time, results of only one phase III trial are available.Molecular targetsIn most familial forms of MTC, one of a variety of germline RET (rearranged during transfection) mutations is found. The proto-oncogene receptor RET is a membrane receptor with tyrosine kinase activity, and these mutations activate the kinase function that triggers downstream mitogenic and survival signaling. Somatic mutations in RET are also found in 30–50% of sporadic MTC tumors, and of these, 80% are mutations at codon 918. Once activated, RET stimulates several intracellular signaling cascades that include the GTPase-Ras/serine/threonine-protein kinase B-raf (BRAF)/mitogen-activated protein kinase (MAPK) and the phosphatidylinositol-4,5-bisphosphate 3-kinase (PI3K)/alpha serine/threonine-protein kinase (AKT) pathways. Besides RET, BRAF mutations have only been rarely reported in MTC, but RAS mutations have been found in 68% of MTC tumors without RET mutation and rarely in MTC harboring a RET mutation (<a class="elsevierStyleCrossRef" href="#bib15">15</a>). Finally, little is known about loss of function of tumor suppressors in MTC (<a class="elsevierStyleCrossRef" href="#bib1">1</a>),(<a class="elsevierStyleCrossRef" href="#bib2">2</a>).Angiogenesis serves a critical role in the development of these hypervascularized tumors and provides another set of potential molecular targets for therapy. Vascular endothelial growth factors (VEGF) and VEGF receptors (VEGFR-1 (Flt-1) and VEGFR-2 (Flk-1, KDR) are often overexpressed in thyroid cancer tissues, both in tumor cells and supporting vascular endothelium, and they also trigger the MAPK signaling pathway (<a class="elsevierStyleCrossRef" href="#bib17">17</a>). Receptors for the fibroblast growth factor and for the platelet-derived growth factor are also often overexpressed and may play a role in tumor angiogenesis.Molecular targeted therapies used in thyroid cancerThe RET kinase appears to be a promising target for molecular therapy of MTC (<a class="elsevierStyleCrossRef" href="#bib2">2</a>),(<a class="elsevierStyleCrossRef" href="#bib14">14</a>). ATP-competitive inhibitors that exert an inhibitory effect on the RET kinase prevent the activation of the downstream proteins (<a class="elsevierStyleCrossRef" href="#tbl1">Table 1</a>). Owing to the close structural relationship between the kinases in RET and VEGFR, most VEGFR kinases inhibitors also inhibit RET kinase. For example, vandetanib effectively inhibits VEGFR2, VEGFR3, epidermal growth factor receptor (EGFR) and RET kinases. X-ray crystallographic analysis of the vandetanib-RET kinase complex demonstrates that the drug docks into the ATP-binding pocket of the kinase, inhibiting the wild-type enzyme and most of the activated mutant forms. Sorafenib, sunitinib, motesanib, lenvatinib (E7080), and cabozantinib (XL-184) are also multi-kinase inhibitors that share the ability to inhibit RET and VEGFR, along with other kinases; in contrast, axitinib and pazopanib seem to act only as anti-VEGFR agents. C-met is overexpressed in medullary thyroid cancer as a result of RET activation, and cabozantinib that inhibits both RET and c-met is being tested in MTC (<a class="elsevierStyleCrossRef" href="#bib16">16</a>),(<a class="elsevierStyleCrossRef" href="#bib18">18</a>).<elsevierMultimedia ident="tbl1"></elsevierMultimedia>Results of clinical trialsAvailable results in MTC (<a class="elsevierStyleCrossRef" href="#tbl2">Table 2</a>) patients from phase I, II, and III trials have clearly confirmed the efficacy of these compounds. To date only vandetanib has achieved US Food and Drug Administration regulatory approval and more recently European Medicines Agency approval for therapy of advanced and progressive MTC, but some treatment guidelines recommend use of available agents for selected patients with progressive metastatic disease on the basis of the phase II results (<a class="elsevierStyleCrossRef" href="#bib1">1</a>),(<a class="elsevierStyleCrossRef" href="#bib19">19</a>).<elsevierMultimedia ident="tbl2"></elsevierMultimedia>Vandetanib at the maximal tolerated dose (300 mg/day) included 30 patients with hereditary MTC who had germline RET mutations. Partial response was observed in 10 patients, among whom six had a confirmed partial response, and stable disease longer than 24 weeks was observed in another 16 patients (<a class="elsevierStyleCrossRef" href="#bib20">20</a>). Another phase II trial with vandetanib (100 mg/day) included 19 hereditary MTC patients, and a partial response was observed in three patients and stable disease lasting 24 weeks or longer in a further 10 patients, demonstrating anti-tumor activity in this setting. However, it is not clear whether the lower dose induced less toxicity, and two patients discontinued the study because of a vandetanib-related adverse event (<a class="elsevierStyleCrossRef" href="#bib21">21</a>).A large randomized phase III trial comparing progression-free survival (PFS) in patients treated with vandetanib (300 mg/day) or placebo has been completed on 331 patients with locally advanced or metastatic MTC (<a class="elsevierStyleCrossRef" href="#bib22">22</a>). The median PFS was significantly prolonged from 19.3 months in the placebo arm to a predicted median of >30.5 months (median not yet reached) in the vandetanib arm (Hazard Ratio 0.46; p<10–4); partial responses were observed in 45% of patients treated with vandetanib, with a predicted median duration of response of 22 months. Benefits of vandetanib treatment were observed in all subgroups of patients, regardless of RET mutation status, progression rate and tumor burden. Sufficient events to analyze overall survival have not occurred yet. The serum calcitonin and carcinoembryonic antigen levels decreased by ≥50% and over a minimum of four weeks in 69% and 52% of patients, respectively. However, calcitonin production by MTC is controlled by the RET signalling pathway, and RET kinase inhibitors may decrease calcitonin production independent of tumor mass changes (<a class="elsevierStyleCrossRef" href="#bib23">23</a>). Time to worsening of pain was significantly improved by vandetanib. In some patients, diarrhea was improved rapidly after initiation of therapy, and this often allowed patients to resume a normal social life. Adverse events, including diarrhea, fatigue, rash, hypertension, and prolongation of the QTc interval on electrocardiogram, were mainly classified as grade 1 or 2. However, 12% of patients receiving vandetanib discontinued treatment and 35% required that their dose of vandetanib be reduced because of an adverse event.Cabozantinib (XL-184). In a phase I trial, cabozantinib induced a partial response in 17 of 34 evaluable MTC patients, of whom 10 had a confirmed partial response, and another 15 patients had stable disease (<a class="elsevierStyleCrossRef" href="#bib18">18</a>). Partial responses were observed regardless of RET mutation status, and in both treatment-naïve patients and patients who had previously been treated with kinase inhibitors, suggesting that there is no cross resistance with other compounds. On the basis of these favorable results, a randomized phase III trial of cabozantinib (175 mg/day) versus placebo is ongoing in patients with progressive MTC (NCT00704730).Motesanib. In a phase II trial, motesanib (starting at 125 mg/day) induced a partial response in only two of 91 patients, but another 43% had stable disease longer than 24 weeks. The low efficacy of the drug may be attributed to its malabsorption related to diarrhea (<a class="elsevierStyleCrossRef" href="#bib24">24</a>).Sorafenib. In a phase II trial, sorafenib (400 mg/twice daily) induced a partial response in two of 21 patients, and another nine patients had stable disease for more than 15 months; calcitonin levels decreased over 50% in nine patients (<a class="elsevierStyleCrossRef" href="#bib25">25</a>). In another trial with five MTC patients, two had a partial response (<a class="elsevierStyleCrossRef" href="#bib26">26</a>). A phase I trial of sorafenib combined with the farnesyl transferase inhibitor tipifarnib yielded partial response in five patients and stable disease in another five patients, with a median PFS of 15 months (<a class="elsevierStyleCrossRef" href="#bib27">27</a>).Axitinib. In a phase II trial, axitinib (5 mg twice daily) induced a partial response in two of 11 patients and another three patients had stable disease lasting at least 16 weeks (<a class="elsevierStyleCrossRef" href="#bib28">28</a>).Sunitinib. In a phase II trial, sunitinib (50 mg/day, 4 weeks on and 2 weeks off) induced a partial response in eight of 25 patients and another 46% had disease stabilization for more than 24 weeks (<a class="elsevierStyleCrossRef" href="#bib29">29</a>). In a smaller trial, sunitinib (37.5 mg/day continuously) induced a partial response in three of six patients (<a class="elsevierStyleCrossRef" href="#bib30">30</a>).Pazopanib. In a phase II trial, pazopanib (800 mg/day) induced a partial response in one of 14 patients and another eight patients had stable disease (<a class="elsevierStyleCrossRef" href="#bib31">31</a>).Lenvatinib (E7080). E7080 showed promising results in several MTC patients in a phase I trial (<a class="elsevierStyleCrossRef" href="#bib32">32</a>), and a phase II trial in progressive MTC is ongoing (NCT00784303).Imatinib. Imatinib was used in two trials (starting dose 600 mg/day) on nine and 15 MTC patients, respectively, and no tumor response was observed (<a class="elsevierStyleCrossRef" href="#bib33">33</a>),(<a class="elsevierStyleCrossRef" href="#bib34">34</a>). In a phase I trial combining imatinib with dacarbazine and capecitabine, no response was observed in seven MTC patients (<a class="elsevierStyleCrossRef" href="#bib35">35</a>).Toxicities of molecularly targeted therapiesAdverse effects from these targeted therapies are significant, including fatigue, hypertension, QTc prolongation, anorexia, diarrhea, cytopenias, and skin toxicities. These short- or median-term side effects may lead to dose reduction in 11–73% of patients and to withdrawal of drug in 7–25%. Serum thyroid-stimulating hormone levels should be regularly monitored as they may increase during treatment with any of these kinase inhibitors; such an effect should lead to an increase in the daily levothyroxine treatment dose (<a class="elsevierStyleCrossRef" href="#bib36">36</a>). Given that these treatment modalities may be given for months or even years, further work to minimize toxicities is needed.CONCLUSION AND PERSPECTIVESAlthough response criteria in contemporary trials differ markedly from those in trials evaluating cytotoxic chemotherapy, the anti-tumor efficacy of these agents in MTC patients is likely to be much greater than that of earlier chemotherapies. Benefits demonstrated with vandetanib in improving PFS and delaying worsening of pain counterbalance its adverse effects. Results of the ongoing phase III trial with cabozantinib are also expected to confirm the promising results obtained in the phase I trial. To date only vandetanib has been labeled by the US Food and Drug Administration for use in the rare MTC patients with a large tumor burden in whom progression has been documented, and it should be used as first-line treatment for this indication. Patients in whom the use of vandetanib is contraindicated or who experience toxicity or resistance should preferably be included in prospective trials, and even phase I trials that are testing the newest therapies should be considered for patients with progressive thyroid cancer, as these protocols may allow early identification of possibly effective drugs (<a class="elsevierStyleCrossRef" href="#bib37">37</a>).The drugs used up to now have similar mechanisms of action: all are anti-angiogenic and most also target the RET kinase. The relative role of the inhibition of each target or of their combined inhibition is currently unknown, but because axitinib and pazopanib are thought not to inhibit RET kinase, responses suggest an important role for the anti-angiogenic effects of these compounds. Also, responses to vandetanib or cabozantinib have been observed in patients without RET mutation, probably indicating that targeting mutant RET may not be necessary in all MTC tumors.Future progress will be made in three directions. Firstly, by improving the knowledge of targets present in each individual tumor and by increasing the number of drugs directed against each of these targets, it may be possible to offer thyroid cancer patients a personalized selection of therapies. Secondly, there is an urgent need to test other drugs in thyroid cancer patients and to understand the basis of tumor response. Further trials should also search for other treatment modalities, including combination with cytotoxic chemotherapy or sequential treatment modalities or immunotherapy (<a class="elsevierStyleCrossRef" href="#bib21">21</a>). Finally, to increase the accrual of patients, to optimize the experimental design of the protocol, to improve the characterization of tumor tissues, and to improve the tolerance of treatment, the collaborative participation of a multidisciplinary team of endocrinologists, oncologists, nuclear physicians, surgeons, pathologists, laboratory researchers, and statisticians should be strongly encouraged through national and international networks.Search strategy: All papers written in English found on PubMed between 2000 and 2010 using the key words “metastatic thyroid cancer, anaplastic thyroid cancer, targeted therapies” were analyzed." "textoCompletoSecciones" => array:1 [ "secciones" => array:4 [ 0 => array:2 [ "identificador" => "xpalclavsec1581186" "titulo" => "KEYWORDS" ] 1 => array:3 [ "identificador" => "cesec10" "titulo" => "INTRODUCTION" "secciones" => array:7 [ 0 => array:2 [ "identificador" => "cesec20" "titulo" => "Selection of patients for clinical trials" ] 1 => array:2 [ "identificador" => "cesec30" "titulo" => "Standard Systemic Treatments" ] 2 => array:2 [ "identificador" => "cesec40" "titulo" => "Molecular Targeted Therapies" ] 3 => array:2 [ "identificador" => "cesec50" "titulo" => "Molecular targets" ] 4 => array:2 [ "identificador" => "cesec60" "titulo" => "Molecular targeted therapies used in thyroid cancer" ] 5 => array:2 [ "identificador" => "cesec70" "titulo" => "Results of clinical trials" ] 6 => array:2 [ "identificador" => "cesec80" "titulo" => "Toxicities of molecularly targeted therapies" ] ] ] 2 => array:2 [ "identificador" => "cesec90" "titulo" => "CONCLUSION AND PERSPECTIVES" ] 3 => array:1 [ "titulo" => "REFERENCES" ] ] ] "pdfFichero" => "main.pdf" "tienePdf" => true "PalabrasClave" => array:1 [ "en" => array:1 [ 0 => array:4 [ "clase" => "keyword" "titulo" => "KEYWORDS" "identificador" => "xpalclavsec1581186" "palabras" => array:2 [ 0 => "Thyroid Neoplasms" 1 => "Molecular Targeted Therapy" ] ] ] ] "tieneResumen" => true "resumen" => array:1 [ "en" => array:1 [ "resumen" => "The recent availability of molecular targeted therapies leads to a reconsideration of the treatment strategy for patients with distant metastases from medullary thyroid carcinoma. In patients with progressive disease, treatment with kinase inhibitors should be offered." ] ] "NotaPie" => array:1 [ 0 => array:1 [ "nota" => "Conflicts of interest: MS: Amgen, Astra-Zeneca, Bayer, Exelixis, Eisai, Genzyme, Ipsen Pharma, Roche. All authors were responsible for the writing and approval of the manuscript." ] ] "multimedia" => array:2 [ 0 => array:7 [ "identificador" => "tbl1" "etiqueta" => "Table 1" "tipo" => "MULTIMEDIATABLA" "mostrarFloat" => true "mostrarDisplay" => false "tabla" => array:2 [ "leyenda" => "VEGFR1 = vascular endothelial growth factor 1, VEGFR2 = vascular endothelial growth factor 2, VEGFR3 = vascular endothelial growth factor 3, BRAF = GTPase-Ras/serine/threonine-protein kinase B-raf." "tablatextoimagen" => array:1 [ 0 => array:1 [ "tabla" => array:1 [ 0 => """ <table border="0" frame="\n \t\t\t\t\tvoid\n \t\t\t\t" class=""><thead title="thead"><tr title="table-row"><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="left" valign="top" scope="col">Drug \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " colspan="6" align="center" valign="top" scope="col" style="border-bottom: 2px solid black">Inhibitory Concentration 50% (nm)</th></tr><tr title="table-row"><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col"> \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="top" scope="col">VEGFR1 \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="top" scope="col">VEGFR2 \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="top" scope="col">VEGFR3 \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="top" scope="col">RET \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="top" scope="col">BRAF \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="top" scope="col">Other targets \t\t\t\t\t\t\n \t\t\t\t\t\t</th></tr></thead><tbody title="tbody"><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="top">Axitinib \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">1.2 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">0.25 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">0.29 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="top">Sunitinib \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">2 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">9 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">17 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">41 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="top">Motesanib \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">2 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">3 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">6 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">59 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">PDGFR, CKIT \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="top">Sorafenib \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">90 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">20 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">49 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">6 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="top">Vandetanib \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">40 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">110 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">100 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">EGFR \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="top">Pazopanib \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">10 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">30 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">47 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">PDGFR, C-KIT \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="top">Cabozantinib (XL184) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">0.035 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">4 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">C-MET, C-KIT \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="top">Lenvatinib (E7080) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">22 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">4 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">5 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">35 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">PDGFR, FGFR \t\t\t\t\t\t\n \t\t\t\t</td></tr></tbody></table> """ ] ] ] ] "descripcion" => array:1 [ "en" => "Kinase inhibitor activities relevant to thyroid carcinomas." ] ] 1 => array:7 [ "identificador" => "tbl2" "etiqueta" => "Table 2" "tipo" => "MULTIMEDIATABLA" "mostrarFloat" => true "mostrarDisplay" => false "tabla" => array:2 [ "leyenda" => "PFS = progression-free survival, OS = overall survival, c = confirmed; NE = not evaluated." "tablatextoimagen" => array:1 [ 0 => array:1 [ "tabla" => array:1 [ 0 => """ <table border="0" frame="\n \t\t\t\t\tvoid\n \t\t\t\t" class=""><thead title="thead"><tr title="table-row"><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col"> \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="top" scope="col">Author \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="top" scope="col">Patients (n) \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="top" scope="col">PR (%) \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="top" scope="col">SD >6 months (%) \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="top" scope="col">Median PFS (months) \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="top" scope="col">Median OS (months) \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="top" scope="col">Dose reduction for toxicity (%) \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="top" scope="col">Withdrawalfor toxicity (%) \t\t\t\t\t\t\n \t\t\t\t\t\t</th></tr></thead><tbody title="tbody"><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="top">Vandetanib \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="top">Wells (2010)Robinson (2010)Wells (2010) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">3019331 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">30/20 c1644 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">53NE53 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">27.9NE30.5 (v) vs. 19.3 (placebo) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">NE10>36 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">731535 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">231112 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="top">Cabozantinib \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="top">Kurzrock (2010) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">34 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">50/29 c \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">44 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="top">Motesanib \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="top">Schlumberger (2009) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">83 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">2 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">43 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">11 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">NE \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">NE \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">NE \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="top">Axitinib \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="top">Cohen (2008) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">11 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">18 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">27 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">17 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">>36 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">38 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">13 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="top">Sunitinib \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="top">De Souza (2010)Carr (2010) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">256 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">3250 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">4633 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">NENE \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">NENE \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">NENE \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="top">Sorafenib \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="top">Kober (2007)Lam (2010) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">519 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">4010 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">aaa43 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">aaa17.9 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">aaaNE \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">aaa76 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">aaa16 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="top">Pazopanib \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="top">Bible (2010) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">14 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">7 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">57 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="top">Imatinib \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="top">DeGroot (2007)Frank-Raue (2007) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">159 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">00 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">2756 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">27 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="top">20 \t\t\t\t\t\t\n \t\t\t\t</td></tr></tbody></table> """ ] ] ] ] "descripcion" => array:1 [ "en" => "Results obtained in patients with medullary thyroid carcinoma with kinase inhibitors." ] ] ] "bibliografia" => array:2 [ "titulo" => "REFERENCES" "seccion" => array:1 [ 0 => array:2 [ "identificador" => "cebibsec10" "bibliografiaReferencia" => array:37 [ 0 => array:3 [ "identificador" => "bib1" "etiqueta" => "1" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Medullary thyroid cancer: management guidelines of the American Thyroid Association" "autores" => array:1 [ 0 => array:3 [ "colaboracion" => "American Thyroid Association Guidelines Task Force" "etal" => true "autores" => array:5 [ 0 => """ RT Kloos \n \t\t\t\t\t\t\t\t """ 1 => """ C Eng \n \t\t\t\t\t\t\t\t """ 2 => """ DB Evans \n \t\t\t\t\t\t\t\t """ 3 => """ GL Francis \n \t\t\t\t\t\t\t\t """ 4 => """ RF Gagel \n \t\t\t\t\t\t\t\t """ ] ] ] ] ] "host" => array:1 [ 0 => array:1 [ "Revista" => array:4 [ "tituloSerie" => "Thyroid" "fecha" => "2009" "volumen" => "19" "paginaInicial" => "612" ] ] ] ] ] ] 1 => array:3 [ "identificador" => "bib2" "etiqueta" => "2" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "New therapeutic approaches to treat medullary thyroid carcinoma" "autores" => array:1 [ 0 => array:2 [ "etal" => false "autores" => array:5 [ 0 => """ M Schlumberger \n \t\t\t\t\t\t\t\t """ 1 => """ F Carlomagno \n \t\t\t\t\t\t\t\t """ 2 => """ E Baudin \n \t\t\t\t\t\t\t\t """ 3 => """ JM Bidart \n \t\t\t\t\t\t\t\t """ 4 => """ M Santoro \n \t\t\t\t\t\t\t\t """ ] ] ] ] ] "host" => array:1 [ 0 => array:1 [ "Revista" => array:4 [ "tituloSerie" => "Nat Clin Pract Endocrinol Metab" "fecha" => "2008" "volumen" => "4" "paginaInicial" => "32" ] ] ] ] ] ] 2 => array:3 [ "identificador" => "bib3" "etiqueta" => "3" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Imaging medullary thyroid carcinoma with persistent elevated calcitonin levels" "autores" => array:1 [ 0 => array:2 [ "etal" => true "autores" => array:6 [ 0 => """ AL Giraudet \n \t\t\t\t\t\t\t\t """ 1 => """ D Vanel \n \t\t\t\t\t\t\t\t """ 2 => """ S Leboulleux \n \t\t\t\t\t\t\t\t """ 3 => """ A Aupérin \n \t\t\t\t\t\t\t\t """ 4 => """ C Dromain \n \t\t\t\t\t\t\t\t """ 5 => """ L Chami \n \t\t\t\t\t\t\t\t """ ] ] ] ] ] "host" => array:1 [ 0 => array:1 [ "Revista" => array:4 [ "tituloSerie" => "J Clin Endocrinol Metab" "fecha" => "2007" "volumen" => "92" "paginaInicial" => "90" ] ] ] ] ] ] 3 => array:3 [ "identificador" => "bib4" "etiqueta" => "4" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "New response evaluation criteria in solid tumours: revised RECIST guideline (version 1.1)" "autores" => array:1 [ 0 => array:2 [ "etal" => true "autores" => array:6 [ 0 => """ EA Eisenhauer \n \t\t\t\t\t\t\t\t """ 1 => """ P Therasse \n \t\t\t\t\t\t\t\t """ 2 => """ J Bogaerts \n \t\t\t\t\t\t\t\t """ 3 => """ LH Schwartz \n \t\t\t\t\t\t\t\t """ 4 => """ D Sargent \n \t\t\t\t\t\t\t\t """ 5 => """ R Ford \n 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Martin Schlumberger

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, Marie-Hélène Massicotte, Camila L. Nascimento, Cécile Chougnet, Eric Baudin, Sophie Leboulleux

University Paris-Sud XI, Institut Gustave Roussy, Department of Nuclear Medicine and Endocrine Oncology, Centre de Référence “Tumeurs Réfractaires de la Thyroïde”, Villejuif, France.

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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="cesec10" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle20">INTRODUCTION</span><p id="para10" class="elsevierStylePara elsevierViewall">Medullary thyroid carcinoma &#40;MTC&#41; accounts for 5&#8211;8&#37; of all thyroid cancers &#40;<a class="elsevierStyleCrossRef" href="#bib1">1</a>&#41;&#44;&#40;<a class="elsevierStyleCrossRef" href="#bib2">2</a>&#41;&#46; Distant metastases are observed at presentation in 7&#8211;23&#37; of MTC patients&#46; In patients with elevated calcitonin levels after initial treatment&#44; clinical recurrence will occur at different time intervals after surgery&#44; depending on the amount of persistent disease and the progression rate&#46; Recurrent disease in the neck and mediastinum is frequently amenable to surgery&#44; and some patients may also benefit from external radiation therapy&#46; Distant metastases are the main cause of MTC-related death&#46; They often affect multiple organs&#44; including lungs&#44; bones&#44; and liver&#44; and more rarely brain&#44; skin&#44; and breast&#44; and they are frequently associated with a neck recurrence &#40;<a class="elsevierStyleCrossRef" href="#bib3">3</a>&#41;&#46; In patients with recurrent disease&#44; a good quality of life is usually maintained&#44; but diarrhea may be debilitating&#46; Slow tumor growth is common and&#44; in retrospective series&#44; survival after the discovery of distant metastases was around 25&#37; at 5 years and 10&#37; at 10 years&#44; but recent series suggest that survival rates might be higher with earlier discovery of metastatic disease&#46;</p><span id="cesec20" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle30">Selection of patients for clinical trials</span><p id="para20" class="elsevierStylePara elsevierViewall">Patients with metastatic MTC must be accurately characterized concerning all clinical prognostic indicators&#44; including age&#44; performance status&#44; histology&#44; disease extent and location&#44; and progression rate&#46; The importance of this latter parameter cannot be overemphasized&#44; as many patients with metastatic MTC can be asymptomatically stable for long periods of time&#44; and in such patients&#44; the benefits of novel therapies may be largely outweighed by drug toxicities and the rigors of clinical trial participation&#46; Also&#44; there is no evidence that the efficacy of these novel therapies is higher at an early stage than later when metastases are larger in size&#44; and treatment can be postponed in most patients until progression has been documented by imaging&#46;</p><p id="para30" class="elsevierStylePara elsevierViewall">Imaging should emphasize identification of all clinically relevant sites of disease&#44; including tumors large enough to be serially assessed to determine response to therapy as well as those that might require additional localized intervention&#44; such as surgery&#44; external radiation therapy&#44; radiofrequency ablation&#44; cryotherapy&#44; cement injection&#44; or embolization&#46; These treatments should be performed whenever needed before the initiation of any systemic treatment&#44; and they may enable systemic treatment to be postponed in some patients&#46;</p><p id="para40" class="elsevierStylePara elsevierViewall">Diagnostic procedures in metastatic MTC patients should include spiral computed tomographic scanning or magnetic resonance imaging of the brain&#44; ultrasonography of the neck&#44; contrast-enhanced spiral computed tomographic scanning of the neck and chest&#44; triple-phase computed tomographic scanning or preferably magnetic resonance imaging of the liver &#40;because liver metastases may be difficult to visualize with computed tomography during anti-angiogenic treatment&#41;&#44; bone scintigraphy and magnetic resonance imaging of the spine and pelvis&#46; Fluorodeoxyglucose &#40;FDG&#41; uptake on positron emission tomography scanning is usually low&#44; and for this reason FDG positron emission tomography scanning is usually poorly sensitive and cannot be used to assess progression rate or response to treatment &#40;<a class="elsevierStyleCrossRef" href="#bib1">1</a>&#41;&#44;&#40;<a class="elsevierStyleCrossRef" href="#bib3">3</a>&#41;&#46;</p><p id="para50" class="elsevierStylePara elsevierViewall">In the absence of treatment&#44; imaging is repeated every six months&#44; and progression rate is assessed using Response Evaluation Criteria in Solid Tumor &#40;RECIST&#41; &#40;<a class="elsevierStyleCrossRef" href="#bib4">4</a>&#41;&#44;&#40;<a class="elsevierStyleCrossRef" href="#bib5">5</a>&#41;&#46; Patients with measurable lesions and documented progression in a given time interval &#40;between 6 and 15 months&#41; should be considered candidates for systemic treatment&#46; Progression rate can also be evaluated by the doubling times of serum markers&#44; calcitonin and carcinoembryonic antigen levels &#40;<a class="elsevierStyleCrossRef" href="#bib6">6</a>&#41;&#44;&#40;<a class="elsevierStyleCrossRef" href="#bib7">7</a>&#41;&#44; but progression should always be confirmed by imaging &#40;<a class="elsevierStyleCrossRef" href="#bib4">4</a>&#41;&#44;&#40;<a class="elsevierStyleCrossRef" href="#bib5">5</a>&#41;&#46;</p></span><span id="cesec30" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle40">Standard Systemic Treatments</span><p id="para60" class="elsevierStylePara elsevierViewall">Symptomatic treatments of diarrhea include loperamide&#44; diphenoxylate&#47;atropine&#44; and codeine &#40;<a class="elsevierStyleCrossRef" href="#bib1">1</a>&#41;&#46; Earlier clinical trials of cytotoxic chemotherapies suffered many shortcomings&#46; Due to both the rarity of apparent benefit and the significant toxicity of the treatments&#44; physicians enrolled only patients with a large tumor burden and rapidly progressive metastatic disease&#46; The few prospective trials that were reported did not include sufficient numbers of patients to demonstrate benefits or reject false-negative conclusions&#46; None used the now-standard RECIST &#40;<a class="elsevierStyleCrossRef" href="#bib4">4</a>&#41;&#44;&#40;<a class="elsevierStyleCrossRef" href="#bib5">5</a>&#41;&#44; and many trials reported results mixing together patients with differentiated thyroid cancer&#44; MTC and anaplastic thyroid cancer&#46; The most frequently tested agent in thyroid cancer patients is doxorubicin&#44; used either alone or in combination with cisplatin&#46; Tumor response rates range from 0&#37; to 22&#37; in MTC patients&#44; with all responses being partial and only lasting a few months &#40;<a class="elsevierStyleCrossRef" href="#bib8">8</a>&#41;&#44;&#40;<a class="elsevierStyleCrossRef" href="#bib9">9</a>&#41;&#46; As MTC is a well-differentiated endocrine tumor&#44; various combinations of 5&#8242;-fluorouracil&#44; dacarbazine&#44; streptozocin&#44; cyclophosphamide&#44; and vincristine have been used and produced some responses &#40;in about 20&#37; of patients&#41; with symptomatic improvement in some &#40;<a class="elsevierStyleCrossRef" href="#bib10">10</a>&#41;&#46; Newer cytotoxic drugs&#44; such as taxanes&#44; gemcitabine&#44; or irinotecan&#44; have not been reported in significant series of MTC patients&#46;</p><p id="para70" class="elsevierStylePara elsevierViewall">Treatment with bi-specific antibodies directed against carcinoembryonic antigen and diethylene triamine pentaacetic acid &#40;DTPA&#41; and with DTPA labeled with <span class="elsevierStyleSup">13</span>I or with octreotide labeled with yttrium-90 prolonged overall survival but did not induce objective responses in patients with large metastases &#40;<a class="elsevierStyleCrossRef" href="#bib11">11</a>&#41;&#44;&#40;<a class="elsevierStyleCrossRef" href="#bib12">12</a>&#41;&#44; and hematological and renal toxicities were significant&#46; Interferon &#945; and somatostatin analogs used either alone or in combination in MTC patients only produced an inconstant and transient effect on diarrhea&#46; Dendritic cell immunotherapy may be effective but is still under evaluation &#40;<a class="elsevierStyleCrossRef" href="#bib13">13</a>&#41;&#46;</p><p id="para80" class="elsevierStylePara elsevierViewall">In conclusion&#44; these therapeutic methods provide low response rates in patients with advanced and progressive refractory MTC&#46;</p></span><span id="cesec40" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle50">Molecular Targeted Therapies</span><p id="para90" class="elsevierStylePara elsevierViewall">Several molecular abnormalities thought to be important in thyroid oncogenesis and&#47;or progression have been defined in MTC and represent potential targets for therapy &#40;<a class="elsevierStyleCrossRef" href="#bib1">1</a>&#41;&#44;&#40;<a class="elsevierStyleCrossRef" href="#bib2">2</a>&#41;&#44;&#40;<a class="elsevierStyleCrossRef" href="#bib14">14</a>&#41;&#46; The aims of treatments are first to improve the quality of life and second to prolong overall survival&#46; Because it is difficult to demonstrate an improvement in overall survival in patients with slowly progressing disease and a long life expectancy&#44; surrogate parameters have been used&#58; the response rate studied in phase II trials is poorly related to overall survival&#59; progression-free survival studied in randomized phase III trials is better related to overall survival&#46; At the present time&#44; results of only one phase III trial are available&#46;</p></span><span id="cesec50" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle60">Molecular targets</span><p id="para100" class="elsevierStylePara elsevierViewall">In most familial forms of MTC&#44; one of a variety of germline RET &#40;rearranged during transfection&#41; mutations is found&#46; The proto-oncogene receptor RET is a membrane receptor with tyrosine kinase activity&#44; and these mutations activate the kinase function that triggers downstream mitogenic and survival signaling&#46; Somatic mutations in RET are also found in 30&#8211;50&#37; of sporadic MTC tumors&#44; and of these&#44; 80&#37; are mutations at codon 918&#46; Once activated&#44; RET stimulates several intracellular signaling cascades that include the GTPase-Ras&#47;serine&#47;threonine-protein kinase B-raf &#40;BRAF&#41;&#47;mitogen-activated protein kinase &#40;MAPK&#41; and the phosphatidylinositol-4&#44;5-bisphosphate 3-kinase &#40;PI3K&#41;&#47;alpha serine&#47;threonine-protein kinase &#40;AKT&#41; pathways&#46; Besides RET&#44; BRAF mutations have only been rarely reported in MTC&#44; but RAS mutations have been found in 68&#37; of MTC tumors without RET mutation and rarely in MTC harboring a RET mutation &#40;<a class="elsevierStyleCrossRef" href="#bib15">15</a>&#41;&#46; Finally&#44; little is known about loss of function of tumor suppressors in MTC &#40;<a class="elsevierStyleCrossRef" href="#bib1">1</a>&#41;&#44;&#40;<a class="elsevierStyleCrossRef" href="#bib2">2</a>&#41;&#46;</p><p id="para110" class="elsevierStylePara elsevierViewall">Angiogenesis serves a critical role in the development of these hypervascularized tumors and provides another set of potential molecular targets for therapy&#46; Vascular endothelial growth factors &#40;VEGF&#41; and VEGF receptors &#40;VEGFR-1 &#40;Flt-1&#41; and VEGFR-2 &#40;Flk-1&#44; KDR&#41; are often overexpressed in thyroid cancer tissues&#44; both in tumor cells and supporting vascular endothelium&#44; and they also trigger the MAPK signaling pathway &#40;<a class="elsevierStyleCrossRef" href="#bib17">17</a>&#41;&#46; Receptors for the fibroblast growth factor and for the platelet-derived growth factor are also often overexpressed and may play a role in tumor angiogenesis&#46;</p></span><span id="cesec60" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle70">Molecular targeted therapies used in thyroid cancer</span><p id="para120" class="elsevierStylePara elsevierViewall">The RET kinase appears to be a promising target for molecular therapy of MTC &#40;<a class="elsevierStyleCrossRef" href="#bib2">2</a>&#41;&#44;&#40;<a class="elsevierStyleCrossRef" href="#bib14">14</a>&#41;&#46; ATP-competitive inhibitors that exert an inhibitory effect on the RET kinase prevent the activation of the downstream proteins &#40;<a class="elsevierStyleCrossRef" href="#tbl1">Table 1</a>&#41;&#46; Owing to the close structural relationship between the kinases in RET and VEGFR&#44; most VEGFR kinases inhibitors also inhibit RET kinase&#46; For example&#44; vandetanib effectively inhibits VEGFR2&#44; VEGFR3&#44; epidermal growth factor receptor &#40;EGFR&#41; and RET kinases&#46; X-ray crystallographic analysis of the vandetanib-RET kinase complex demonstrates that the drug docks into the ATP-binding pocket of the kinase&#44; inhibiting the wild-type enzyme and most of the activated mutant forms&#46; Sorafenib&#44; sunitinib&#44; motesanib&#44; lenvatinib &#40;E7080&#41;&#44; and cabozantinib &#40;XL-184&#41; are also multi-kinase inhibitors that share the ability to inhibit RET and VEGFR&#44; along with other kinases&#59; in contrast&#44; axitinib and pazopanib seem to act only as anti-VEGFR agents&#46; C-met is overexpressed in medullary thyroid cancer as a result of RET activation&#44; and cabozantinib that inhibits both RET and c-met is being tested in MTC &#40;<a class="elsevierStyleCrossRef" href="#bib16">16</a>&#41;&#44;&#40;<a class="elsevierStyleCrossRef" href="#bib18">18</a>&#41;&#46;</p><elsevierMultimedia ident="tbl1"></elsevierMultimedia></span><span id="cesec70" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle80">Results of clinical trials</span><p id="para130" class="elsevierStylePara elsevierViewall">Available results in MTC &#40;<a class="elsevierStyleCrossRef" href="#tbl2">Table 2</a>&#41; patients from phase I&#44; II&#44; and III trials have clearly confirmed the efficacy of these compounds&#46; To date only vandetanib has achieved US Food and Drug Administration regulatory approval and more recently European Medicines Agency approval for therapy of advanced and progressive MTC&#44; but some treatment guidelines recommend use of available agents for selected patients with progressive metastatic disease on the basis of the phase II results &#40;<a class="elsevierStyleCrossRef" href="#bib1">1</a>&#41;&#44;&#40;<a class="elsevierStyleCrossRef" href="#bib19">19</a>&#41;&#46;</p><elsevierMultimedia ident="tbl2"></elsevierMultimedia><p id="para140" class="elsevierStylePara elsevierViewall">Vandetanib at the maximal tolerated dose &#40;300 mg&#47;day&#41; included 30 patients with hereditary MTC who had germline RET mutations&#46; Partial response was observed in 10 patients&#44; among whom six had a confirmed partial response&#44; and stable disease longer than 24 weeks was observed in another 16 patients &#40;<a class="elsevierStyleCrossRef" href="#bib20">20</a>&#41;&#46; Another phase II trial with vandetanib &#40;100 mg&#47;day&#41; included 19 hereditary MTC patients&#44; and a partial response was observed in three patients and stable disease lasting 24 weeks or longer in a further 10 patients&#44; demonstrating anti-tumor activity in this setting&#46; However&#44; it is not clear whether the lower dose induced less toxicity&#44; and two patients discontinued the study because of a vandetanib-related adverse event &#40;<a class="elsevierStyleCrossRef" href="#bib21">21</a>&#41;&#46;</p><p id="para150" class="elsevierStylePara elsevierViewall">A large randomized phase III trial comparing progression-free survival &#40;PFS&#41; in patients treated with vandetanib &#40;300 mg&#47;day&#41; or placebo has been completed on 331 patients with locally advanced or metastatic MTC &#40;<a class="elsevierStyleCrossRef" href="#bib22">22</a>&#41;&#46; The median PFS was significantly prolonged from 19&#46;3 months in the placebo arm to a predicted median of &#62;30&#46;5 months &#40;median not yet reached&#41; in the vandetanib arm &#40;Hazard Ratio 0&#46;46&#59; <span class="elsevierStyleItalic">p</span>&#60;10<span class="elsevierStyleSup">&#8211;4</span>&#41;&#59; partial responses were observed in 45&#37; of patients treated with vandetanib&#44; with a predicted median duration of response of 22 months&#46; Benefits of vandetanib treatment were observed in all subgroups of patients&#44; regardless of RET mutation status&#44; progression rate and tumor burden&#46; Sufficient events to analyze overall survival have not occurred yet&#46; The serum calcitonin and carcinoembryonic antigen levels decreased by &#8805;50&#37; and over a minimum of four weeks in 69&#37; and 52&#37; of patients&#44; respectively&#46; However&#44; calcitonin production by MTC is controlled by the RET signalling pathway&#44; and RET kinase inhibitors may decrease calcitonin production independent of tumor mass changes &#40;<a class="elsevierStyleCrossRef" href="#bib23">23</a>&#41;&#46; Time to worsening of pain was significantly improved by vandetanib&#46; In some patients&#44; diarrhea was improved rapidly after initiation of therapy&#44; and this often allowed patients to resume a normal social life&#46; Adverse events&#44; including diarrhea&#44; fatigue&#44; rash&#44; hypertension&#44; and prolongation of the QTc interval on electrocardiogram&#44; were mainly classified as grade 1 or 2&#46; However&#44; 12&#37; of patients receiving vandetanib discontinued treatment and 35&#37; required that their dose of vandetanib be reduced because of an adverse event&#46;</p><p id="para160" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleBold">Cabozantinib &#40;XL-184&#41;&#46;</span> In a phase I trial&#44; cabozantinib induced a partial response in 17 of 34 evaluable MTC patients&#44; of whom 10 had a confirmed partial response&#44; and another 15 patients had stable disease &#40;<a class="elsevierStyleCrossRef" href="#bib18">18</a>&#41;&#46; Partial responses were observed regardless of RET mutation status&#44; and in both treatment-na&#239;ve patients and patients who had previously been treated with kinase inhibitors&#44; suggesting that there is no cross resistance with other compounds&#46; On the basis of these favorable results&#44; a randomized phase III trial of cabozantinib &#40;175 mg&#47;day&#41; versus placebo is ongoing in patients with progressive MTC &#40;NCT00704730&#41;&#46;</p><p id="para170" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleBold">Motesanib&#46;</span> In a phase II trial&#44; motesanib &#40;starting at 125 mg&#47;day&#41; induced a partial response in only two of 91 patients&#44; but another 43&#37; had stable disease longer than 24 weeks&#46; The low efficacy of the drug may be attributed to its malabsorption related to diarrhea &#40;<a class="elsevierStyleCrossRef" href="#bib24">24</a>&#41;&#46;</p><p id="para180" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleBold">Sorafenib&#46;</span> In a phase II trial&#44; sorafenib &#40;400 mg&#47;twice daily&#41; induced a partial response in two of 21 patients&#44; and another nine patients had stable disease for more than 15 months&#59; calcitonin levels decreased over 50&#37; in nine patients &#40;<a class="elsevierStyleCrossRef" href="#bib25">25</a>&#41;&#46; In another trial with five MTC patients&#44; two had a partial response &#40;<a class="elsevierStyleCrossRef" href="#bib26">26</a>&#41;&#46; A phase I trial of sorafenib combined with the farnesyl transferase inhibitor tipifarnib yielded partial response in five patients and stable disease in another five patients&#44; with a median PFS of 15 months &#40;<a class="elsevierStyleCrossRef" href="#bib27">27</a>&#41;&#46;</p><p id="para190" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleBold">Axitinib&#46;</span> In a phase II trial&#44; axitinib &#40;5 mg twice daily&#41; induced a partial response in two of 11 patients and another three patients had stable disease lasting at least 16 weeks &#40;<a class="elsevierStyleCrossRef" href="#bib28">28</a>&#41;&#46;</p><p id="para200" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleBold">Sunitinib&#46;</span> In a phase II trial&#44; sunitinib &#40;50 mg&#47;day&#44; 4 weeks on and 2 weeks off&#41; induced a partial response in eight of 25 patients and another 46&#37; had disease stabilization for more than 24 weeks &#40;<a class="elsevierStyleCrossRef" href="#bib29">29</a>&#41;&#46; In a smaller trial&#44; sunitinib &#40;37&#46;5 mg&#47;day continuously&#41; induced a partial response in three of six patients &#40;<a class="elsevierStyleCrossRef" href="#bib30">30</a>&#41;&#46;</p><p id="para210" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleBold">Pazopanib&#46;</span> In a phase II trial&#44; pazopanib &#40;800 mg&#47;day&#41; induced a partial response in one of 14 patients and another eight patients had stable disease &#40;<a class="elsevierStyleCrossRef" href="#bib31">31</a>&#41;&#46;</p><p id="para220" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleBold">Lenvatinib &#40;E7080&#41;&#46;</span> E7080 showed promising results in several MTC patients in a phase I trial &#40;<a class="elsevierStyleCrossRef" href="#bib32">32</a>&#41;&#44; and a phase II trial in progressive MTC is ongoing &#40;NCT00784303&#41;&#46;</p><p id="para230" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleBold">Imatinib&#46;</span> Imatinib was used in two trials &#40;starting dose 600 mg&#47;day&#41; on nine and 15 MTC patients&#44; respectively&#44; and no tumor response was observed &#40;<a class="elsevierStyleCrossRef" href="#bib33">33</a>&#41;&#44;&#40;<a class="elsevierStyleCrossRef" href="#bib34">34</a>&#41;&#46; In a phase I trial combining imatinib with dacarbazine and capecitabine&#44; no response was observed in seven MTC patients &#40;<a class="elsevierStyleCrossRef" href="#bib35">35</a>&#41;&#46;</p></span><span id="cesec80" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle90">Toxicities of molecularly targeted therapies</span><p id="para240" class="elsevierStylePara elsevierViewall">Adverse effects from these targeted therapies are significant&#44; including fatigue&#44; hypertension&#44; QTc prolongation&#44; anorexia&#44; diarrhea&#44; cytopenias&#44; and skin toxicities&#46; These short- or median-term side effects may lead to dose reduction in 11&#8211;73&#37; of patients and to withdrawal of drug in 7&#8211;25&#37;&#46; Serum thyroid-stimulating hormone levels should be regularly monitored as they may increase during treatment with any of these kinase inhibitors&#59; such an effect should lead to an increase in the daily levothyroxine treatment dose &#40;<a class="elsevierStyleCrossRef" href="#bib36">36</a>&#41;&#46; Given that these treatment modalities may be given for months or even years&#44; further work to minimize toxicities is needed&#46;</p></span></span><span id="cesec90" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle100">CONCLUSION AND PERSPECTIVES</span><p id="para250" class="elsevierStylePara elsevierViewall">Although response criteria in contemporary trials differ markedly from those in trials evaluating cytotoxic chemotherapy&#44; the anti-tumor efficacy of these agents in MTC patients is likely to be much greater than that of earlier chemotherapies&#46; Benefits demonstrated with vandetanib in improving PFS and delaying worsening of pain counterbalance its adverse effects&#46; Results of the ongoing phase III trial with cabozantinib are also expected to confirm the promising results obtained in the phase I trial&#46; To date only vandetanib has been labeled by the US Food and Drug Administration for use in the rare MTC patients with a large tumor burden in whom progression has been documented&#44; and it should be used as first-line treatment for this indication&#46; Patients in whom the use of vandetanib is contraindicated or who experience toxicity or resistance should preferably be included in prospective trials&#44; and even phase I trials that are testing the newest therapies should be considered for patients with progressive thyroid cancer&#44; as these protocols may allow early identification of possibly effective drugs &#40;<a class="elsevierStyleCrossRef" href="#bib37">37</a>&#41;&#46;</p><p id="para260" class="elsevierStylePara elsevierViewall">The drugs used up to now have similar mechanisms of action&#58; all are anti-angiogenic and most also target the RET kinase&#46; The relative role of the inhibition of each target or of their combined inhibition is currently unknown&#44; but because axitinib and pazopanib are thought not to inhibit RET kinase&#44; responses suggest an important role for the anti-angiogenic effects of these compounds&#46; Also&#44; responses to vandetanib or cabozantinib have been observed in patients without RET mutation&#44; probably indicating that targeting mutant RET may not be necessary in all MTC tumors&#46;</p><p id="para270" class="elsevierStylePara elsevierViewall">Future progress will be made in three directions&#46; Firstly&#44; by improving the knowledge of targets present in each individual tumor and by increasing the number of drugs directed against each of these targets&#44; it may be possible to offer thyroid cancer patients a personalized selection of therapies&#46; Secondly&#44; there is an urgent need to test other drugs in thyroid cancer patients and to understand the basis of tumor response&#46; Further trials should also search for other treatment modalities&#44; including combination with cytotoxic chemotherapy or sequential treatment modalities or immunotherapy &#40;<a class="elsevierStyleCrossRef" href="#bib21">21</a>&#41;&#46; Finally&#44; to increase the accrual of patients&#44; to optimize the experimental design of the protocol&#44; to improve the characterization of tumor tissues&#44; and to improve the tolerance of treatment&#44; the collaborative participation of a multidisciplinary team of endocrinologists&#44; oncologists&#44; nuclear physicians&#44; surgeons&#44; pathologists&#44; laboratory researchers&#44; and statisticians should be strongly encouraged through national and international networks&#46;</p><p id="para280" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleBold">Search strategy&#58;</span> All papers written in English found on PubMed between 2000 and 2010 using the key words &#8220;metastatic thyroid cancer&#44; anaplastic thyroid cancer&#44; targeted therapies&#8221; were analyzed&#46;</p></span></span>"
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        "resumen" => "<span id="ceabs10" class="elsevierStyleSection elsevierViewall"><p id="spara50" class="elsevierStyleSimplePara elsevierViewall">The recent availability of molecular targeted therapies leads to a reconsideration of the treatment strategy for patients with distant metastases from medullary thyroid carcinoma&#46; In patients with progressive disease&#44; treatment with kinase inhibitors should be offered&#46;</p></span>"
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        "nota" => "<p class="elsevierStyleNotepara" id="cenpara10"><span class="elsevierStyleBold">Conflicts of interest&#58;</span></p> <p class="elsevierStyleNotepara" id="cenpara20">MS&#58; Amgen&#44; Astra-Zeneca&#44; Bayer&#44; Exelixis&#44; Eisai&#44; Genzyme&#44; Ipsen Pharma&#44; Roche&#46;</p> <p class="elsevierStyleNotepara" id="cenpara30">All authors were responsible for the writing and approval of the manuscript&#46;</p>"
      ]
    ]
    "multimedia" => array:2 [
      0 => array:7 [
        "identificador" => "tbl1"
        "etiqueta" => "Table 1"
        "tipo" => "MULTIMEDIATABLA"
        "mostrarFloat" => true
        "mostrarDisplay" => false
        "tabla" => array:2 [
          "leyenda" => "<p id="spara20" class="elsevierStyleSimplePara elsevierViewall">VEGFR1 &#61; vascular endothelial growth factor 1&#44; VEGFR2 &#61; vascular endothelial growth factor 2&#44; VEGFR3 &#61; vascular endothelial growth factor 3&#44; BRAF &#61; GTPase-Ras&#47;serine&#47;threonine-protein kinase B-raf&#46;</p>"
          "tablatextoimagen" => array:1 [
            0 => array:1 [
              "tabla" => array:1 [
                0 => """
                  <table border="0" frame="\n
                  \t\t\t\t\tvoid\n
                  \t\t\t\t" class=""><thead title="thead"><tr title="table-row"><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="left" valign="top" scope="col">Drug&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " colspan="6" align="center" valign="top" scope="col" style="border-bottom: 2px solid black">Inhibitory Concentration 50&#37; &#40;nm&#41;</th></tr><tr title="table-row"><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="center" valign="top" scope="col">VEGFR1&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="center" valign="top" scope="col">VEGFR2&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="center" valign="top" scope="col">VEGFR3&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="center" valign="top" scope="col">RET&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="center" valign="top" scope="col">BRAF&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="center" valign="top" scope="col">Other targets&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th></tr></thead><tbody title="tbody"><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="top">Axitinib&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">1&#46;2&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">0&#46;25&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">0&#46;29&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="top">Sunitinib&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">2&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">9&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">17&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">41&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="top">Motesanib&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">2&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">3&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">6&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">59&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">PDGFR&#44; CKIT&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="top">Sorafenib&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">90&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">20&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">49&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">6&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="top">Vandetanib&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">40&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">110&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">100&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">EGFR&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="top">Pazopanib&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">10&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">30&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">47&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">PDGFR&#44; C-KIT&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="top">Cabozantinib &#40;XL184&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">0&#46;035&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">4&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">C-MET&#44; C-KIT&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="top">Lenvatinib &#40;E7080&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">22&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">4&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">5&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">35&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">PDGFR&#44; FGFR&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr></tbody></table>
                  """
              ]
            ]
          ]
        ]
        "descripcion" => array:1 [
          "en" => "<p id="spara10" class="elsevierStyleSimplePara elsevierViewall">Kinase inhibitor activities relevant to thyroid carcinomas&#46;</p>"
        ]
      ]
      1 => array:7 [
        "identificador" => "tbl2"
        "etiqueta" => "Table 2"
        "tipo" => "MULTIMEDIATABLA"
        "mostrarFloat" => true
        "mostrarDisplay" => false
        "tabla" => array:2 [
          "leyenda" => "<p id="spara40" class="elsevierStyleSimplePara elsevierViewall">PFS &#61; progression-free survival&#44; OS &#61; overall survival&#44; c &#61; confirmed&#59; NE &#61; not evaluated&#46;</p>"
          "tablatextoimagen" => array:1 [
            0 => array:1 [
              "tabla" => array:1 [
                0 => """
                  <table border="0" frame="\n
                  \t\t\t\t\tvoid\n
                  \t\t\t\t" class=""><thead title="thead"><tr title="table-row"><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="center" valign="top" scope="col">Author&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="center" valign="top" scope="col">Patients &#40;n&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="center" valign="top" scope="col">PR &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="center" valign="top" scope="col">SD &#62;6 months &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="center" valign="top" scope="col">Median PFS &#40;months&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="center" valign="top" scope="col">Median OS &#40;months&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="center" valign="top" scope="col">Dose reduction for toxicity &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="center" valign="top" scope="col">Withdrawalfor toxicity &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th></tr></thead><tbody title="tbody"><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="top">Vandetanib&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="top">Wells &#40;2010&#41;Robinson &#40;2010&#41;Wells &#40;2010&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">3019331&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">30&#47;20 c1644&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">53NE53&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">27&#46;9NE30&#46;5 &#40;v&#41; <span class="elsevierStyleItalic">vs&#46;</span> 19&#46;3 &#40;placebo&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">NE10&#62;36&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">731535&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">231112&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="top">Cabozantinib&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="top">Kurzrock &#40;2010&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">34&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">50&#47;29 c&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">44&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="top">Motesanib&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="top">Schlumberger &#40;2009&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">83&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">2&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">43&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">11&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">NE&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">NE&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">NE&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="top">Axitinib&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="top">Cohen &#40;2008&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">11&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">18&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">27&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">17&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">&#62;36&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">38&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">13&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="top">Sunitinib&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="top">De Souza &#40;2010&#41;Carr &#40;2010&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">256&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">3250&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">4633&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">NENE&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">NENE&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">NENE&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="top">Sorafenib&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="top">Kober &#40;2007&#41;Lam &#40;2010&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">519&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">4010&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">aaa43&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">aaa17&#46;9&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">aaaNE&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">aaa76&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">aaa16&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="top">Pazopanib&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="top">Bible &#40;2010&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">14&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">7&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">57&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="top">Imatinib&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="top">DeGroot &#40;2007&#41;Frank-Raue &#40;2007&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">159&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">00&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">2756&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">27&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">20&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr></tbody></table>
                  """
              ]
            ]
          ]
        ]
        "descripcion" => array:1 [
          "en" => "<p id="spara30" class="elsevierStyleSimplePara elsevierViewall">Results obtained in patients with medullary thyroid carcinoma with kinase inhibitors&#46;</p>"
        ]
      ]
    ]
    "bibliografia" => array:2 [
      "titulo" => "REFERENCES"
      "seccion" => array:1 [
        0 => array:2 [
          "identificador" => "cebibsec10"
          "bibliografiaReferencia" => array:37 [
            0 => array:3 [
              "identificador" => "bib1"
              "etiqueta" => "1"
              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "Medullary thyroid cancer&#58; management guidelines of the American Thyroid Association"
                      "autores" => array:1 [
                        0 => array:3 [
                          "colaboracion" => "American Thyroid Association Guidelines Task Force"
                          "etal" => true
                          "autores" => array:5 [
                            0 => """
                              RT Kloos \n
                              \t\t\t\t\t\t\t\t
                              """
                            1 => """
                              C Eng \n
                              \t\t\t\t\t\t\t\t
                              """
                            2 => """
                              DB Evans \n
                              \t\t\t\t\t\t\t\t
                              """
                            3 => """
                              GL Francis \n
                              \t\t\t\t\t\t\t\t
                              """
                            4 => """
                              RF Gagel \n
                              \t\t\t\t\t\t\t\t
                              """
                          ]
                        ]
                      ]
                    ]
                  ]
                  "host" => array:1 [
                    0 => array:1 [
                      "Revista" => array:4 [
                        "tituloSerie" => "Thyroid"
                        "fecha" => "2009"
                        "volumen" => "19"
                        "paginaInicial" => "612"
                      ]
                    ]
                  ]
                ]
              ]
            ]
            1 => array:3 [
              "identificador" => "bib2"
              "etiqueta" => "2"
              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "New therapeutic approaches to treat medullary thyroid carcinoma"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => false
                          "autores" => array:5 [
                            0 => """
                              M Schlumberger \n
                              \t\t\t\t\t\t\t\t
                              """
                            1 => """
                              F Carlomagno \n
                              \t\t\t\t\t\t\t\t
                              """
                            2 => """
                              E Baudin \n
                              \t\t\t\t\t\t\t\t
                              """
                            3 => """
                              JM Bidart \n
                              \t\t\t\t\t\t\t\t
                              """
                            4 => """
                              M Santoro \n
                              \t\t\t\t\t\t\t\t
                              """
                          ]
                        ]
                      ]
                    ]
                  ]
                  "host" => array:1 [
                    0 => array:1 [
                      "Revista" => array:4 [
                        "tituloSerie" => "Nat Clin Pract Endocrinol Metab"
                        "fecha" => "2008"
                        "volumen" => "4"
                        "paginaInicial" => "32"
                      ]
                    ]
                  ]
                ]
              ]
            ]
            2 => array:3 [
              "identificador" => "bib3"
              "etiqueta" => "3"
              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "Imaging medullary thyroid carcinoma with persistent elevated calcitonin levels"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => true
                          "autores" => array:6 [
                            0 => """
                              AL Giraudet \n
                              \t\t\t\t\t\t\t\t
                              """
                            1 => """
                              D Vanel \n
                              \t\t\t\t\t\t\t\t
                              """
                            2 => """
                              S Leboulleux \n
                              \t\t\t\t\t\t\t\t
                              """
                            3 => """
                              A Aup&#233;rin \n
                              \t\t\t\t\t\t\t\t
                              """
                            4 => """
                              C Dromain \n
                              \t\t\t\t\t\t\t\t
                              """
                            5 => """
                              L Chami \n
                              \t\t\t\t\t\t\t\t
                              """
                          ]
                        ]
                      ]
                    ]
                  ]
                  "host" => array:1 [
                    0 => array:1 [
                      "Revista" => array:4 [
                        "tituloSerie" => "J Clin Endocrinol Metab"
                        "fecha" => "2007"
                        "volumen" => "92"
                        "paginaInicial" => "90"
                      ]
                    ]
                  ]
                ]
              ]
            ]
            3 => array:3 [
              "identificador" => "bib4"
              "etiqueta" => "4"
              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "New response evaluation criteria in solid tumours&#58; revised RECIST guideline &#40;version 1&#46;1&#41;"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => true
                          "autores" => array:6 [
                            0 => """
                              EA Eisenhauer \n
                              \t\t\t\t\t\t\t\t
                              """
                            1 => """
                              P Therasse \n
                              \t\t\t\t\t\t\t\t
                              """
                            2 => """
                              J Bogaerts \n
                              \t\t\t\t\t\t\t\t
                              """
                            3 => """
                              LH Schwartz \n
                              \t\t\t\t\t\t\t\t
                              """
                            4 => """
                              D Sargent \n
                              \t\t\t\t\t\t\t\t
                              """
                            5 => """
                              R Ford \n
                              \t\t\t\t\t\t\t\t
                              """
                          ]
                        ]
                      ]
                    ]
                  ]
                  "host" => array:1 [
                    0 => array:1 [
                      "Revista" => array:4 [
                        "tituloSerie" => "Eur J Cancer"
                        "fecha" => "2009"
                        "volumen" => "45"
                        "paginaInicial" => "47"
                      ]
                    ]
                  ]
                ]
              ]
            ]
            4 => array:3 [
              "identificador" => "bib5"
              "etiqueta" => "5"
              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "New guidelines to evaluate the response to treatment in solid tumors&#46; European Organization for Research and Treatment of Cancer&#44; National Cancer Institute of the United States&#44; National Cancer Institute of Canada"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => true
                          "autores" => array:6 [
                            0 => """
                              P Therasse \n
                              \t\t\t\t\t\t\t\t
                              """
                            1 => """
                              SG Arbuck \n
                              \t\t\t\t\t\t\t\t
                              """
                            2 => """
                              EA Eisenhauer \n
                              \t\t\t\t\t\t\t\t
                              """
                            3 => """
                              J Wanders \n
                              \t\t\t\t\t\t\t\t
                              """
                            4 => """
                              RS Kaplan \n
                              \t\t\t\t\t\t\t\t
                              """
                            5 => """
                              L Rubinstein \n
                              \t\t\t\t\t\t\t\t
                              """
                          ]
                        ]
                      ]
                    ]
                  ]
                  "host" => array:1 [
                    0 => array:1 [
                      "Revista" => array:4 [
                        "tituloSerie" => "J Natl Cancer Inst"
                        "fecha" => "2000"
                        "volumen" => "92"
                        "paginaInicial" => "16"
                      ]
                    ]
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                            0 => """
                              AM Tsimberidou \n
                              \t\t\t\t\t\t\t\t
                              """
                            1 => """
                              C Vaklavas \n
                              \t\t\t\t\t\t\t\t
                              """
                            2 => """
                              S Wen \n
                              \t\t\t\t\t\t\t\t
                              """
                            3 => """
                              D Hong \n
                              \t\t\t\t\t\t\t\t
                              """
                            4 => """
                              J Wheler \n
                              \t\t\t\t\t\t\t\t
                              """
                            5 => """
                              C Ng \n
                              \t\t\t\t\t\t\t\t
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                  "host" => array:1 [
                    0 => array:1 [
                      "Revista" => array:4 [
                        "tituloSerie" => "J Clin Endocrinol Metab"
                        "fecha" => "2009"
                        "volumen" => "94"
                        "paginaInicial" => "32"
                      ]
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              ]
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Article information

ISSN: 18075932
Original language: English

DOI:10.6061/clinics/2012(Sup01)21

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Year/Month	Html	Pdf	Total

2024 November	6	2	8
2024 October	28	38	66
2024 September	30	21	51
2024 August	29	23	52
2024 July	18	17	35
2024 June	17	13	30
2024 May	19	16	35
2024 April	14	25	39
2024 March	20	15	35
2024 February	22	11	33
2024 January	12	12	24
2023 December	14	17	31
2023 November	15	18	33
2023 October	16	28	44
2023 September	13	23	36
2023 August	6	2	8
2023 July	13	28	41
2023 June	9	5	14
2023 May	2	3	5
2023 April	2	11	13
2023 March	1	8	9
2023 February	2	0	2
2023 January	2	1	3
2022 December	5	1	6

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