Adenocarcinoma do estômago: análise de aspectos morfológicos e do perfil imuno-histoquímico de mucinas dos tipos histológicos propostos na classificação da Sociedade Brasileira de Patologia, 2005 / Adenocarcinoma of the stomach: analysis of morphological and immunohistochemical profile of mucin-type proposed histological classification of the Brazilian Society of Pathology, 2005

Ricardo Camillo de Almeida

Aiming at a critical assessment of the histological types proposed at the classification of Brazilian Society of Pathology for gastric adenocarcinoma, we studied herein the histological and immunohistochemical profile of mucins in 272 gastric adenocarcinoma surgical samples from Hospital das Clínicas University of São Paulo School of Medicine. The casuistic can be divided into 237 single tumors, 4 multiple tumors and 31 tumors with more than one histological type. We evaluated age, gender, tumor location and appearance, tumor staging, the expression patterns of intestinal mucins by the markers MUC2 and CD10 and for gastric tumor by MUC5AC and MUC6 markers. The coexistence of foci of poorly differentiated pattern and foci of gastric pattern in gastric adenocarcinoma with more than one pattern and in cases with more than one tumor and the absence of such concurrence with the intestinal pattern, lead to its understanding as independent patterns. Favorable histological variables prevailed in gastric adenocarcinomas of intestinal pattern, followed by the gastric tubular pattern. These represent the core for future studies to include: the tubulo-papilary type, whose clinical features resemble the intestinal types, the tubular type with uncharacteristic mucin expression and the microtubulat type, individualized for the first time in the present study, with less favorable morphological aspects and immunohistochemical expression of the gastric mucosa itself. Mucinous adenocarcinomas have shown a stricking dichotomy in both clinical and morphological aspects, as in the expression pattern of mucins. Data indicate the need to understand them as disparate entities. The mucocelular type (signet ring cells) was detected in cases found inearly tumor stages, but includes the highest fraction of advanced tumors, Borrmann IV with predominant expression of gastric mucins. Muconodular type was only detected in advanced stages and co-expressed intestinal and gastric mucins. The poorly differentiated cases were frankly distinct from the other types, by both clinical and morphological data, and by the scarcity of mucin expression.

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