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Long-term effect of combined therapy with somatostatin analogs and dopamine agonists as a primary treatment in a non-functioning invasive pituitary macroadenoma
Efecto terapéutico a largo plazo de los analógos de somatostatina y agonistas dopaminérgicos como tratamiento médico primario en un macroadenoma hipofisario no funcionante invasivo
Pedro Iglesiasa,
Corresponding author
piglo65@gmail.com

Corresponding author.
, Jorge Cardonab, Juan J. Díeza
a Department of Endocrinology, Hospital Universitario Puerta de Hierro Majadahonda, Madrid, Spain
b Department of Nuclear Medicine, Hospital Universitario Puerta de Hierro Majadahonda, Madrid, Spain
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The clinical experience with medical treatment with somatostatin analogs &#40;SSA&#41; and dopamine agonists &#40;DA&#41; as a primary treatment in these tumors is poorly defined&#46;</p><p id="par0010" class="elsevierStylePara elsevierViewall">A 46-year-old man was referred to us for assessment of pituitary tumor discovered in a cranial CT during the study of headache in the last 5&#8211;6 months&#46; Clinically&#44; the patient did not show symptoms of adenohypophyseal hypo-hyperfunction or diabetes insipidus&#46; No galactorrhea or erectile dysfunction&#44; and libido was preserved&#46; Hormonal evaluation showed central hypogonadism &#91;FSH 2&#46;3<span class="elsevierStyleHsp" style=""></span>mIU&#47;ml &#40;NR&#44; 1&#46;4&#8211;18&#41;&#44; LH 1&#46;5<span class="elsevierStyleHsp" style=""></span>mUI&#47;ml &#40;1&#46;5&#8211;9&#46;3&#41;&#44; testosterone 93&#46;9<span class="elsevierStyleHsp" style=""></span>ng&#47;dl &#40;241 &#8211; 827&#41;&#93;&#44; and mild hyperprolactinemia &#91;PRL 49&#46;1<span class="elsevierStyleHsp" style=""></span>ng&#47;ml &#40;2&#46;2&#8211;17&#46;7&#41;&#44; PRL after dilution 47&#46;8<span class="elsevierStyleHsp" style=""></span>ng&#47;ml&#93;&#46; The rest of the pituitary function was normal &#91;TSH 2&#46;05<span class="elsevierStyleHsp" style=""></span>&#956;IU&#47;ml &#40;0&#46;35&#8211;5&#46;0&#41;&#44; free T4 1&#46;09<span class="elsevierStyleHsp" style=""></span>ng&#47;dl &#40;0&#46;7&#8211;1&#46;98&#41;&#44; ACTH 56&#46;3<span class="elsevierStyleHsp" style=""></span>pg&#47;ml &#40;9&#46;0&#8211;55&#46;0&#41;&#44; cortisol 13&#46;6<span class="elsevierStyleHsp" style=""></span>&#956;g&#47;dl &#40;4&#46;3&#8211;22&#46;4&#41;&#44; urinary free cortisol 16<span class="elsevierStyleHsp" style=""></span>&#956;g&#47;24<span class="elsevierStyleHsp" style=""></span>h &#40;11&#46;0&#8211;71&#46;0&#41;&#44; Nugent test&#58; cortisol 0&#46;8<span class="elsevierStyleHsp" style=""></span>&#956;g&#47;dl&#44; GH 0&#46;8<span class="elsevierStyleHsp" style=""></span>ng&#47;ml &#40;4&#46;3&#8211;6&#46;3&#41;&#44; and IGF-I 134<span class="elsevierStyleHsp" style=""></span>ng&#47;ml &#40;55&#46;0&#8211;420&#46;0&#41;&#93;&#46; Pituitary MRI confirmed the presence of an invasive pituitary tumor of 2&#46;0<span class="elsevierStyleHsp" style=""></span>&#215;<span class="elsevierStyleHsp" style=""></span>1&#46;7<span class="elsevierStyleHsp" style=""></span>&#215;<span class="elsevierStyleHsp" style=""></span>3&#46;0<span class="elsevierStyleHsp" style=""></span>cm with suprasellar extension with greater involvement of the right side&#44; extending to both cavernous sinuses and encompassing the right and partially left carotid &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#46; The campimetric study of the visual fields was normal&#46; A <span class="elsevierStyleSup">99m</span>Tc-EDDA&#47;HYNIC-Tyr3-Octreotide &#40;tektrotyd&#41; scintigraphy revealed a hypercaptant lesion at pituitary level &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#46; With the clinical diagnosis of invasive non-functioning pituitary macroadenoma associated with mild hyperprolactinemia&#44; due to probable compression of the pituitary stalk&#44; and central hypogonadism&#44; he started therapy with lanreotide autogel 120<span class="elsevierStyleHsp" style=""></span>mg&#47;month sc and oral cabergoline 0&#46;5<span class="elsevierStyleHsp" style=""></span>mg&#47;week&#44; and was referred to the Neurosurgery Department for surgical treatment of the PA&#46; Shortly after starting medical treatment&#44; the patient showed a marked clinical improvement of headaches&#44; without visual disturbances&#46; A new pituitary MRI performed 3 months after starting medical treatment showed a marked reduction in pituitary adenoma size &#40;1&#46;2<span class="elsevierStyleHsp" style=""></span>&#215;<span class="elsevierStyleHsp" style=""></span>1&#46;5<span class="elsevierStyleHsp" style=""></span>&#215;<span class="elsevierStyleHsp" style=""></span>2&#46;5<span class="elsevierStyleHsp" style=""></span>cm&#41; &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#46; Due to the excellent clinical and radiological evolution&#44; it was decided to postpone surgery&#46; At 6 months after starting medical treatment&#44; the patient referred notable clinical improvement of headaches without visual disturbances&#44; the adenohypophyseal function was controlled &#40;testosterone 496&#46;10<span class="elsevierStyleHsp" style=""></span>ng&#47;dl and PRL 0&#46;5<span class="elsevierStyleHsp" style=""></span>ng&#47;ml&#41; and pituitary MRI showed marked reduction of the macroadenoma size with respect to the previous MRI &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#46; From that moment the patient was treated with lanreotide autogel 120<span class="elsevierStyleHsp" style=""></span>mg&#47;month sc and oral cabergoline 0&#46;25<span class="elsevierStyleHsp" style=""></span>mg&#47;week&#46; A year and a half after starting treatment&#44; pituitary function remained controlled &#40;testosterone 418<span class="elsevierStyleHsp" style=""></span>ng&#47;dl and PRL 0&#46;5<span class="elsevierStyleHsp" style=""></span>ng&#47;ml&#41; and tumor size remained stable with respect to the last pituitary MRI performed at sixth month&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0015" class="elsevierStylePara elsevierViewall">NFPA is around 25&#8211;35&#37; of pituitary tumors&#44; being most of them gonadotropinomas&#44; which account for as many as 40&#8211;50&#37; of all pituitary macroadenomas&#46;<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">3</span></a> At diagnosis&#44; most NFPAs are macroadenomas and&#44; on many occasions&#44; they are incidentally diagnosed&#46;<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">2</span></a> Surgery is the treatment of choice for symptomatic &#40;headache&#44; visual disturbances and neurological involvement&#41; NFPAs&#44; those associated with pituitary apoplexy and those that show growth during the surveillance&#46; However&#44; complete surgical resection&#44; especially in invasive adenomas &#40;Knosp grades 3&#8211;4&#41; is exceptionally achieved&#46; For this reason and&#44; as a complementary treatment to a debulking surgery&#44; radiotherapy is usually used to control the tumor remnant or its recurrence&#46;<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">4</span></a> Radiotherapy achieves an excellent long-term local tumor control but at the expense of a high rate of hypopituitarism&#46;</p><p id="par0020" class="elsevierStylePara elsevierViewall">As occurs with prolactinomas&#44; where DAs constitute the first-line therapy&#44; NFPAs also express dopamine D2 receptors &#40;D2R&#41;&#46; D2R expression has been reported in about 35&#8211;40&#37; of NFPAs and DAs &#40;bromocriptine and cabergoline&#41; have been shown to decrease gonadotropin and alpha-subunit secretion in gonadotroph adenomas&#46;<a class="elsevierStyleCrossRefs" href="#bib0085"><span class="elsevierStyleSup">5&#8211;7</span></a> Therefore&#44; DAs could have a therapeutic role in the medical management of NFPAs&#46; In fact&#44; in these patients&#44; pooled results have shown a reduction of tumor size and stabilization of disease in 30&#37; and 58&#37; of patients&#44; respectively&#46;<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">8</span></a></p><p id="par0025" class="elsevierStylePara elsevierViewall">On the other hand&#44; NFPAs can also express somatostatin receptors &#40;SSTRs&#41;&#44;<a class="elsevierStyleCrossRef" href="#bib0105"><span class="elsevierStyleSup">9</span></a> although its clinical relevance has not been fully defined&#46; The finding of significant expression of SSTR type 2 &#40;SSTR2&#41; and type 5 &#40;SSTR5&#41; has suggested a possible therapeutic role regarding the use of SST analogs in preventing tumor recurrence in NFPAs&#46;<a class="elsevierStyleCrossRef" href="#bib0110"><span class="elsevierStyleSup">10</span></a> SSA as primary medical therapy for NFPAs has shown low tumor response rates &#40;12&#8211;40&#37;&#41;&#44;<a class="elsevierStyleCrossRef" href="#bib0115"><span class="elsevierStyleSup">11</span></a> however the combination therapy with DA and SSA can increase tumor response rate &#91;mean reduction in tumor volume of 30<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>4&#37; &#40;18&#8211;46&#37;&#41; after 6 months of combination therapy with octreotide and cabergoline&#93; in 60&#37; of NFPA patients&#46;<a class="elsevierStyleCrossRef" href="#bib0120"><span class="elsevierStyleSup">12</span></a> SSTRs and D2R may have additive effects on cell proliferation in pituitary adenomas thought interaction by heterodimerization as shown for SSTR1-SSTR5&#44; SSTR5-D2R&#44; SSTR2-SSTR3&#44; and SSTR2-D2R&#46;<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">8</span></a> In fact&#44; SSA and cabergoline are usually used after surgery in invasive NFPA&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">In our patient&#44; the long-term clinical management with combined medical treatment with SSA and DA was encouraged for several facts&#58; &#40;1&#41; the positive tumor uptake in scintigraphy with 99mTc-tektrotyd that was compatible with high SSTR expression by the tumor&#59; &#40;2&#41; the spectacular and rapid clinical response of headache to medical treatment associated with good tolerance&#59; &#40;3&#41; the adequate control of hyperprolactinemia and hypogonadism with cabergoline&#59; &#40;4&#41; the low probability of complete surgical resection due to the high degree of invasiveness of the tumor &#40;Knosp grades 3&#8211;4&#41;&#59; and &#40;5&#41; the rapid &#40;3 months&#41; and striking response in terms of tumor size reduction &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#46;</p><p id="par0035" class="elsevierStylePara elsevierViewall">In summary&#44; our clinical case suggests that those patients with large and invasive NFPAs without neuro-ophthalmological involvement and little likelihood of complete surgical resection&#44; that are associated with mild hyperprolactinemia and positive tumor uptake in SSTR scintigraphy&#44; combined treatment with DA and SSA could be considered as an initial therapeutic alternative to surgical treatment&#46;</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Informed consent</span><p id="par0040" class="elsevierStylePara elsevierViewall">The patient signed the consent for the publication of the clinical case&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0010">Conflicts of interest</span><p id="par0045" class="elsevierStylePara elsevierViewall">The authors have no conflict of interest and financial support in relation to the present manuscript&#46;</p></span></span>"
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