Pertinent risk factors and gastric carcinoma with synchronous peritoneal dissemination or liver metastasis.

From 1965 to 1985, of 1108 patients with advanced gastric cancer who underwent gastric resection in our department, 216 patients (19.5%) had synchronous peritoneal dissemination (PD) or liver metastasis (LM). The 1-year survival rate was 22.5% for PD, 14.7% for LM, and 4.8% for PD plus LM (p less than 0.01). With PD, patients were younger, tumor was larger, Borrmann type 3 and 4 and undifferentiated lesions were more frequent, and the incidence of serosal invasion was higher. Histologic findings showed a pattern of infiltrative growth. With LM, patients were more likely to be male, Borrmann type 2 and 3 and differentiated lesions were frequent, and the antral region was often involved. The degree of serosal invasion was less than with PD. The pattern of growth was the expansive type and vascular involvement was prominent. Rate of lymph node metastasis was high in both groups. The route of metastasis was partly linked to features of the primary lesion. Multivariate analysis showed that independent risk factors involved in the occurrence of each metastasis are serosal invasion, lymph node metastasis, and undifferentiated tissue type for PD, and lymph node metastasis and vascular involvement for LM. When designing treatment in an attempt to suppress a recurrence, even after curative resection, all of these risk factors must be kept in mind.