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Since they have the advantage of being directed specifically and mainly to the lesion and its microenvironment, their use reduces damage to healthy cells and most adverse effects of non-specific therapies.<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a></p><p id="par0010" class="elsevierStylePara elsevierViewall">Due to binding to the extracellular portion of epithelial growth factor receptors (EGFR) and interrupting the coupling of their usual ligands, anti-EGFR monoclonal antibodies prevent the cascade reactions triggered by their activation. As a rule, activation of these receptors, which are known to be part of a family comprising four distinct members, but which share common structural elements, culminates in cell proliferation, angiogenesis, inhibition of apoptosis, and metastasis. For this reason, EGFR blockade has been used as a targeted therapy for several neoplasms that produce their overexpression, which is, in itself, considered a criterion for worse prognosis.<a class="elsevierStyleCrossRefs" href="#bib0010"><span class="elsevierStyleSup">2,3</span></a></p><p id="par0015" class="elsevierStylePara elsevierViewall">EGFR inhibition also affects the proliferation of non-neoplastic cells, due to the natural presence of these receptors in keratinocytes, sebaceous glands and hair follicles. Therefore, this therapeutic modality has the potential to trigger adverse cutaneous effects that, although generally well tolerated and self-limited, when severe can restrict the use of these medications.<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">4</span></a></p><p id="par0020" class="elsevierStylePara elsevierViewall">Among the most common dermatological reactions is the acneiform rash that appears on the trunk and face, without the presence of comedones. Nail and hair involvement and the appearance of telangiectasias can also be part of the condition; paronychia, pyogenic granuloma, alopecia, eyelash trichomegaly, and facial hypertrichosis can also be observed. Studies demonstrate that lengthening and straightening of eyelashes, associated with changes in hair texture, can be present with ultra-structural and subclinical changes. Another less common effect is the appearance of melanocytic nevi and angioedema.<a class="elsevierStyleCrossRef" href="#bib0025"><span class="elsevierStyleSup">5</span></a></p><p id="par0025" class="elsevierStylePara elsevierViewall">The effects of three drugs that act by inhibiting EGFR ‒ panitumumab, erlotinib and gefitinib ‒ have already been evaluated using scanning electron microscopy, and hair grooving and twisted hair shafts have been observed. Through these investigations, changes were evidenced that generated clinical or subclinical variants of the phenotype described as <span class="elsevierStyleItalic">pili canaliculi</span>, characterized clinically by curly or wavy hair.<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">6</span></a></p><p id="par0030" class="elsevierStylePara elsevierViewall">Cetuximab is a monoclonal antibody that inhibits EGFR and, in combination with chemotherapy, is approved as a first-line treatment for metastatic colorectal cancer with expression of the aforementioned receptor, and even as isolated therapy in patients intolerant to chemotherapy.</p><p id="par0035" class="elsevierStylePara elsevierViewall">Even though they have action mechanisms that are similar to those of drugs whose effects on hair have already been observed, it is speculated whether the structural differences between cetuximab and these other drugs may result in different effects. In this context, the present study aims to observe, using scanning electron microscopy, the three-dimensional ultrastructure of the eyelashes and hair shafts of a patient receiving this therapy.</p><p id="par0040" class="elsevierStylePara elsevierViewall">A 64-year-old female patient who presented with colon carcinoma and liver metastases was treated with chemotherapy (FOLFIRI protocol: fluorouracil + leucovorin + irinotecan) and cetuximab for 12 months. She was referred for the treatment of acneiform rash on the trunk and face, which responded to treatment with oral tetracycline (500 mg twice a day for ten days). She reported changes in hair waviness (<a class="elsevierStyleCrossRef" href="#fig0005">Fig. 1</a>), which became frizzy after the start of the oncological therapy. The eyelashes changed their curvature and became elongated (<a class="elsevierStyleCrossRef" href="#fig0005">Fig. 1</a>).</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0045" class="elsevierStylePara elsevierViewall">Hair shafts and eyelash samples were collected and examined <span class="elsevierStyleItalic">in natura</span> using scanning electron microscopy.</p><p id="par0050" class="elsevierStylePara elsevierViewall">Hair shafts showed on low power, longitudinal channels and discrete twists (<a class="elsevierStyleCrossRef" href="#fig0010">Fig. 2</a>). On higher magnifications, the channels become quite evident (<a class="elsevierStyleCrossRef" href="#fig0015">Fig. 3</a>). The examination of the eyelashes showed more pronounced changes, with well-developed, double (<a class="elsevierStyleCrossRef" href="#fig0020">Fig. 4</a>a) or single (<a class="elsevierStyleCrossRef" href="#fig0020">Fig. 4</a>b) channels.</p><elsevierMultimedia ident="fig0010"></elsevierMultimedia><elsevierMultimedia ident="fig0015"></elsevierMultimedia><elsevierMultimedia ident="fig0020"></elsevierMultimedia><p id="par0055" class="elsevierStylePara elsevierViewall">These findings show that the change caused by cetuximab causes channels in the shafts, they may modify the elasticity of hairs shafts, altering their curvature or making them frizzy. These changes overlap with those caused by panitumumab<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">6</span></a> and oral EGF inhibitors and are similar to the genetic forms of <span class="elsevierStyleItalic">pili canaliculi</span>, which are within the spectrum of the uncombable hair syndrome. The twisting was discreet, not characterizing <span class="elsevierStyleItalic">pili torti</span>, as they would have to rotate 180 degrees.<a class="elsevierStyleCrossRef" href="#bib0035"><span class="elsevierStyleSup">7</span></a></p><p id="par0060" class="elsevierStylePara elsevierViewall">With both cetuximab and panitumumab,<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">6</span></a> eyelashes show ultra-structurally more prominent channels, and the authors presume that this may be due to their slower or shorter anagen phase.</p><p id="par0065" class="elsevierStylePara elsevierViewall">Other medications used concomitantly, following the protocol for colon cancer metastatic disease, should not be the cause of the hair changes reported herein, as these are characteristic of EGFR inhibitors.</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Financial support</span><p id="par0070" class="elsevierStylePara elsevierViewall">None declared.</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0010">Authors' contributions</span><p id="par0075" class="elsevierStylePara elsevierViewall">Hiram Larangeira de Almeida Jr.: Approval of the final version of the manuscript; design and planning of the study; drafting and editing of the manuscript; collection, analysis, and interpretation of data; effective participation in research orientation; intellectual participation in the propaedeutic and/or therapeutic conduct of the studied cases; critical review of the literature; critical review of the manuscript.</p><p id="par0080" class="elsevierStylePara elsevierViewall">Debora Sarzi Sartori: Approval of the final version of the manuscript; design and planning of the study; drafting and editing of the manuscript; collection, analysis, and interpretation of data; intellectual participation in the propaedeutic and/or therapeutic conduct of the studied cases; critical review of the literature; critical review of the manuscript;</p><p id="par0085" class="elsevierStylePara elsevierViewall">Felipe Yusuke Sato Shinzato: Approval of the final version of the manuscript; design and planning of the study; drafting and editing of the manuscript; collection, analysis, and interpretation of data; intellectual participation in the propaedeutic and/or therapeutic conduct of the studied cases; critical review of the literature; critical review of the manuscript.</p><p id="par0090" class="elsevierStylePara elsevierViewall">Samuel da Silva Julião: Approval of the final version of the manuscript; design and planning of the study; drafting and editing of the manuscript; collection, analysis, and interpretation of data; intellectual participation in the propaedeutic and/or therapeutic conduct of the studied cases; critical review of the literature; critical review of the manuscript.</p><p id="par0095" class="elsevierStylePara elsevierViewall">Sílvia Saueressig: Approval of the final version of the manuscript; design and planning of the study; drafting and editing of the manuscript; collection, analysis, and interpretation of data; intellectual participation in the propaedeutic and/or therapeutic conduct of the studied cases; critical review of the literature; critical review of the manuscript.</p></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0015">Conflicts of interest</span><p id="par0100" class="elsevierStylePara elsevierViewall">None declared.</p></span></span>" "textoCompletoSecciones" => array:1 [ "secciones" => array:4 [ 0 => array:2 [ "identificador" => "sec0005" "titulo" => "Financial support" ] 1 => array:2 [ "identificador" => "sec0010" "titulo" => "Authors' contributions" ] 2 => array:2 [ "identificador" => "sec0015" "titulo" => "Conflicts of interest" ] 3 => array:1 [ "titulo" => "References" ] ] ] "pdfFichero" => "main.pdf" "tienePdf" => true "fechaRecibido" => "2023-03-22" "fechaAceptado" => "2023-04-20" "NotaPie" => array:1 [ 0 => array:2 [ "etiqueta" => "☆" "nota" => "<p class="elsevierStyleNotepara" id="npar0005">Study conducted at the Postgraduation in Health and Behavior, Universidade Católica de Pelotas, Pelotas, RS, Brazil.</p>" ] ] "multimedia" => array:4 [ 0 => array:8 [ "identificador" => "fig0005" "etiqueta" => "Figure 1" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr1.jpeg" "Alto" => 1712 "Ancho" => 1508 "Tamanyo" => 308272 ] ] "detalles" => array:1 [ 0 => array:3 [ "identificador" => "at0005" "detalle" => "Figure " "rol" => "short" ] ] "descripcion" => array:1 [ "en" => "<p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Clinical appearance with curly hair, elongated eyelashes in the insert.</p>" ] ] 1 => array:8 [ "identificador" => "fig0010" "etiqueta" => "Figure 2" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr2.jpeg" "Alto" => 1794 "Ancho" => 1675 "Tamanyo" => 264149 ] ] "detalles" => array:1 [ 0 => array:3 [ "identificador" => "at0010" "detalle" => "Figure " "rol" => "short" ] ] "descripcion" => array:1 [ "en" => "<p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Scanning electron microscopy – (A) Hair shaft with longitudinal channel (×150). 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