[Synchronous or metachronous extragastric neoplasms associated with gastric neoplasia. Common pathogenesis of gastric intestinal and colonic carcinoma?].

Coexistence of syncronous or metacronous extragastric carcinomas, particularly of the colon and small bowel may favour the hypothesis of a common origin with gastric carcinoma. Three cases of colonic carcinoma coexisting with early gastric cancer, are presented. The etiopathogenesis of intestinal-type gastric cancer and colonic cancer are discussed in the light of a possible common mechanism.