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Letter to the Editor
Panniculitis in patients treated with BRAF/MEK inhibitors: Presentation of 4 new cases
Paniculitis en pacientes tratados con iBRAF/iMEK: presentación de 4 nuevos casos
Patricia Cordeiro Gonzáleza, Ana Taibo Martínezb, Carmen Peña Penabadb,
Corresponding author
cppenabad@hotmail.com

Corresponding author.
a Servicio de Oncología Médica, Complexo Hospitalario Universitario de A Coruña, A Coruña, Spain
b Servicio de Dermatología, Complexo Hospitalario Universitario de A Coruña, A Coruña, Spain
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    "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">BRAF inhibitors &#40;BRAFi&#41; and MEK inhibitors &#40;MEKi&#41; have meant a paradigm shift in the management of multiple malignancies&#46; BRAF V600E mutations &#40;valine to glutamic acid substitution at position 600&#41; are a high-frequency event in melanoma &#40;&#8776;50&#37;&#41; and of low frequency in lung cancer &#40;&#8776;2&#37;&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a> The presence of BRAF V600E mutations in tumour cells predicts the response to BRAFi&#44; alone or in combination with MEKi&#46;</p><p id="par0010" class="elsevierStylePara elsevierViewall">Numerous adverse reactions of BRAFi&#47;MEKi have been described&#44; some of them due to paradoxical activation of the MAPK pathway in wild-type BRAF cells&#46; The most common cutaneous adverse reactions &#40;CAR&#41; are photosensitivity&#44; xerosis&#44; palmoplantar hyperkeratosis&#44; verrucous lesions&#44; and squamous cell carcinomas&#46;<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a> Serious CARs have also been described&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a></p><p id="par0015" class="elsevierStylePara elsevierViewall">Panniculitis is less common&#44; with only fifty cases described&#46;<a class="elsevierStyleCrossRefs" href="#bib0010"><span class="elsevierStyleSup">2&#8211;4</span></a> Its etiopathogenesis is not well defined&#44; and its management requires multidisciplinary action&#46;</p><p id="par0020" class="elsevierStylePara elsevierViewall">We conducted a retrospective study of cases of panniculitis secondary to BRAFi&#47;MEKi diagnosed at the Complexo Hospitalario Universitario de A Coru&#241;a from January 2016 to January 2019&#46;</p><p id="par0025" class="elsevierStylePara elsevierViewall">Of 29 patients treated with BRAFi&#47;MEKi&#44; 4 developed panniculitis&#44; representing an incidence of 13&#46;8&#37;&#46; Three were patients with melanoma and one had lung adenocarcinoma&#46; The 4 cases were women in treatment with dabrafenib&#160;&#43;&#160;trametinib&#44; aged between 58 and 64&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">The time from the start of treatment to the development of panniculitis ranged from 3 to 26 weeks&#46;</p><p id="par0035" class="elsevierStylePara elsevierViewall">The general presentation &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41; consisted of hot&#44; painful&#44; erythematous nodules predominantly in BLL&#44; especially in the pretibial area&#46; However&#44; 3 patients also developed lesions in the trunk&#44; one of them in BUL&#46; Extracutaneous symptoms such as fever or arthralgia accompanied the condition in 3 of the patients&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0040" class="elsevierStylePara elsevierViewall">The histopathological study showed lobular panniculitis in 2 patients &#40;one accompanied by vasculitis&#41; and septal panniculitis without vasculitis in the other 2&#44; with lymphohistiocytic infiltrate in all of them&#44; and with the presence of giant cells in one of the samples &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#46;</p><p id="par0045" class="elsevierStylePara elsevierViewall">The treatment of panniculitis is symptomatic and must be adapted to the severity of the symptoms&#46; Oral anti-inflammatories and topical corticosteroids were administered in all 4 cases&#46; In addition&#44; in those with greater systemic involvement&#44; oral corticosteroids &#40;prednisone 30&#160;mg per day in tapering regimen&#41;&#44; with improvement of symptoms in less than 2 weeks&#46; Permanent discontinuation of the drug was not necessary&#46;</p><p id="par0050" class="elsevierStylePara elsevierViewall">Subsequently&#44; 2 of the patients developed tumour progression and&#44; therefore&#44; the targeted therapy was discontinued&#44; with resolution of the panniculitis&#46;</p><p id="par0055" class="elsevierStylePara elsevierViewall">Since the introduction of BRAFi&#47;MEKi&#44; there have been multiple publications about their CAR&#46;<a class="elsevierStyleCrossRefs" href="#bib0010"><span class="elsevierStyleSup">2&#8211;4</span></a> Panniculitis has been described in around 50 patients&#44; with melanoma being the most commonly associated tumour&#46; In our series&#44; we report the first case of panniculitis in a patient with lung adenocarcinoma treated with BRAFi&#47;MEKi&#46;</p><p id="par0060" class="elsevierStylePara elsevierViewall">In the retrospective study by Carlos et al&#46;<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a> panniculitis occurs more frequently in patients treated with vemurafenib &#40;11&#46;1&#37;&#41;&#44; followed by those receiving combined treatment with dabrafenib&#160;&#43;&#160;trametinib &#40;10&#37;&#41; and&#44; less frequently&#44; dabrafenib monotherapy &#40;2&#46;5&#37;&#41;&#46;</p><p id="par0065" class="elsevierStylePara elsevierViewall">According to Piroth et al&#46;<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">4</span></a> panniculitis affects the fat lobules in 62&#37; of cases&#44; the septa in 14&#37;&#44; and both in 24&#37;&#46; Vasculitis is described in 26&#37;&#44; with a neutrophilic infiltrate in more than half of the cases&#46; In our series&#44; all 4 cases had lymphohistiocytic infiltrates&#44; 2 in the septa and 2 in the lobules&#44; and vasculitis was detected in one of the 4 patients&#46;</p><p id="par0070" class="elsevierStylePara elsevierViewall">Treatment is symptomatic&#46; The optimal dose of prednisone is not well defined&#44; with significant variability between authors &#40;from 15&#160;mg to 1&#160;mg&#47;kg&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0025"><span class="elsevierStyleSup">5</span></a> In our series&#44; we prescribed prednisone 30&#160;mg a day as the initial dose&#44; with an early tapering regimen&#44; all of them showing a good response&#46; Proper diagnosis and management of skin lesions would prevent discontinuation of targeted therapy in these patients&#46;</p><p id="par0075" class="elsevierStylePara elsevierViewall">In conclusion&#44; septal or lobular panniculitis is a CAR of BRAFi&#47;MEKi&#46; The clinical presentation consists of painful&#44; erythematous subcutaneous nodules that may be accompanied by systemic manifestations&#46; Knowledge of this CAR will enable appropriate symptomatic treatment to be established&#44; avoiding discontinuation of targeted therapy in most cases&#46;</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Ethical considerations</span><p id="par0080" class="elsevierStylePara elsevierViewall">The centres&#8217; protocols on the publication of patient data were complied with&#44; and the privacy of the subjects was respected&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0010">Funding</span><p id="par0085" class="elsevierStylePara elsevierViewall">There are no public or private sources of funding for the conduct of this study&#46;</p></span></span>"
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        "nota" => "<p class="elsevierStyleNotepara" id="npar0005">Please cite this article as&#58; Cordeiro Gonz&#225;lez P&#44; Taibo Mart&#237;nez A&#44; Pe&#241;a Penabad C&#46; Paniculitis en pacientes tratados con iBRAF&#47;iMEK&#58; presentaci&#243;n de 4 nuevos casos&#46; Med Clin &#40;Barc&#41;&#46; 2022&#59;158&#58;e8&#8211;e9&#46;</p>"
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          "en" => "<p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Clinical and histopathological characteristics of panniculitis lesions&#46; A and B&#41; Clinical characteristics of 2 of the cases&#58; erythematous-violaceous nodular lesions &#40;&#8594;&#41; on the legs &#40;A&#41; and arms &#40;B&#41;&#46; C&#41; Septal panniculitis&#58; predominantly septal lymphohistiocytic infiltrate &#40;&#42;&#41;&#46; D&#41; Lobular panniculitis&#58; lymphohistiocytic fat lobule infiltrate &#40;&#8594;&#41;&#46;</p>"
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