Assuntos
Benzoatos/efeitos adversos , Hidrazinas/efeitos adversos , Isquemia/etiologia , Púrpura Trombocitopênica Idiopática/tratamento farmacológico , Pirazóis/efeitos adversos , Trombose/induzido quimicamente , Idoso , Biópsia , Clopidogrel/uso terapêutico , Angiografia por Tomografia Computadorizada , Tratamento Conservador , Feminino , Humanos , Oxigenoterapia Hiperbárica , Isquemia/patologia , Isquemia/terapia , Contagem de Plaquetas , Púrpura Trombocitopênica Idiopática/sangue , Pele/irrigação sanguínea , Pele/diagnóstico por imagem , Pele/patologia , Trombose/complicações , Trombose/diagnóstico , Trombose/tratamento farmacológico , Artérias da Tíbia/diagnóstico por imagem , Artérias da Tíbia/patologia , Dedos do Pé/irrigação sanguínea , Dedos do Pé/diagnóstico por imagem , Dedos do Pé/patologia , Resultado do Tratamento , Varfarina/uso terapêuticoRESUMO
Primary cutaneous mucinous carcinoma (PCMC) is a rare sweat gland tumor characterized by the presence of abundant mucin around the tumor islands, but the molecular mechanisms for this structure are not well elucidated. Because mucin is epithelial in nature, it is likely to be produced by epithelial tumor cells, not by surrounding stromal cells. We hypothesized that the abundant mucin is a result of reversed cellular polarity of the tumor. To test this hypothesis, we conducted an immunohistological study to investigate expression of tight junction (TJ) proteins occludin and ZO-1 in PCMC, as well as in normal sweat glands and other sweat gland tumors. Dot-like or linear expression of TJ proteins was observed at ductal structures of sweat glands, and ductal or cystic structures of related tumors. In PCMC, however, TJ protein expression was clearly visible at the edges of tumor cell islands. This study provides evidence to show that the characteristic histological structure of PCMC is caused by inverse polarization of the tumor cells, and that TJ proteins are useful markers of ductal differentiation in sweat gland tumors.