Carcinoma de células de Merkel: Estudio de 3 casos

Merkel cell carcinoma: Report on 3 patients Merkel cell carcinoma: Report on 3 patients

Rev Chil Cir 2016; 68 (6): 456-461

Autor(es):

Julio Miguel Vila Blanco
Said Nabhan

Merkel cell carcinoma: Report on 3 patients

AbstractResumen

Introducción: El objetivo del trabajo es exponer 3 casos de carcinoma de células de Merkel (CCM), carcinoma trabecular o carcinoma indiferenciado de células pequeñas de la piel. Se trata de un tumor poco frecuente y con características bien definidas, asociado a la radiación, la inmunosupresión y recientemente a polyomavirus. Material y método: Estudio clínico descriptivo de 3 adultos intervenidos entre 2011 y 2013 en los servicios de cirugía general y maxilofacial de nuestro centro. Se trata de 2 varones (50 y 79 años) y una mujer (79 años). Resultados: El varón más joven presentó una adenopatía inguinal derecha, sin que pudiera localizarse la lesión primaria; el otro paciente estaba siendo tratado con infliximab por enfermedad inflamatoria intestinal y presentó una lesión en el labio inferior. La paciente presentó una lesión pretibial derecha. El diagnóstico se realizó mediante estudio inmunohistoquímico de las biopsias (CK-20 y CAM 5.2 positivas; TTF-1 negativo; cromogranina y NSE positivas 2 y una intermedia). En los 3 casos se realizó cirugía y la técnica del ganglio centinela. El tratamiento se continuó con quimioterapia adyuvante en 2 pacientes y radioterapia en el paciente que había sido tratado con infliximab. Este paciente falleció. Conclusiones: El CCM es raro, se presenta en adultos con unas manifestaciones clínicas no definidas; su diagnóstico temprano se realiza por sospecha y la biopsia se confirma mediante técnicas de inmunohistoquímica. El tratamiento es quirúrgico, con técnica del ganglio centinela, y quimio-radioterapia adyuvante.

Aim: Our purpose was to report on three patients having Merkel cell carcinoma (MCC). This tumor is a trabecular carcinoma or undifferentiated small cell carcinoma of the skin. It represents a rare and well-defined characteristic neoplasm, associated with radiation, immunosuppression and recently with the polyomavirus. Material and methods: Descriptive clinical study of three adult patients treated between 2011 and 2013 in our center either in the General Surgery Department or Oral Surgery Department. There were two men (50 and 79 years) and one woman (79 years). Results: The youngest man presented with a right inguinal lymph node. The primary lesion was not found. The second male patient had been on infliximab therapy due inflammatory bowel disease and had a lesion on the inferior lip. The single female patient had a right pretibial lesion. Diagnosis was made by means of immunohistochemical analysis of biopsies (CAM 5.2 and CK-20 positive, TTF-1 negative, chromogranin and NSE positive intermediate 2 and 1). In all three cases surgery and sentinel node technique was performed. After surgery, treatment was continued with adjuvant chemotherapy in two patients. Radiotherapy was applied to the patient who had been on infliximab therapy. This patient ultimately died. Conclusions: MCC is a rare tumor. It occurs in adult patients with distinct clinical features. It has to be suspected to allow an early diagnosis. Diagnosis is made by biopsy and it is confirmed by immunohistochemistry. Surgery with the sentinel node technique is the usual treatment, besides adjuvant chemoradiotherapy it is also applied.


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