A clinicopathologic study on multiple gastric cancers with special reference to distal gastrectomy.

Simultaneous multiple gastric cancer was seen in 49 (5.8%) of 852 resected stomachs. Patients with multiple cancers were older than those with single gastric cancers (P less than 0.01) and the incidence of multiple gastric cancer was significantly higher in male patients than in female patients (P less than 0.05). The incidence rates of multiple carcinomas were 9.6% of early gastric carcinomas and 4.0% of advanced gastric carcinomas. With regard to histologic type, the incidence rate of the differentiated type was 71% and the incidence rate of the undifferentiated type was 29%. In 68 serially resected stomachs, 5 (7.4%) new multiple cancers were detected microscopically, whereas 4 (5.9%) had already been diagnosed grossly. The incidence rate of multiple carcinoma increased to 13.2% by this procedure. The cases that were cut serially showed that most of the multiple cancers were located distally from the F-line presenting the line along which intestinal metaplasia appeared. This study suggests that the surgeon is required to resect the area including the F-line at the time of distal gastrectomy so as not to leave another cancer in the gastric remnant.