[Factors in the prognosis of early gastric cancer]

Prognosis factors for 1,012 subjects who underwent gastrectomy for early gastric cancer were studied over a 21-year period from 1965 to 1985. We divided submucosal cancer (sm) into two subgroups, classifying the one as sm II-1 with small cancerous nests in the submucosa and the other as sm II-2. Our cases of early gastric cancer fell into the following groups: m(mucosal cancer), 451 cases; sm II-1, 106; sm II-2, 396 and multiple cancer, 59. The rate of lymph node metastasis was 1.1% in the m group, 5.7% in the sm II-1 group, 24.5% in the sm II-2 group and 6.8% in the multiple group. Gastrectomy with removal of the second-group lymph node proved adequate for sm II-2 group. The five year survival rate was 94.5% in the m group, 94.9% in sm II-1 group, 93.6% in the sm II-2 group and 91.7% in the multiple cancer group. The rate of recurrence in m group was 0.9%, against 3.3% for sm II-2 group. The sm II-2 with histologically well-differentiated type, n(+) and macroscopically Borrmann type are high-risk groups. Adjuvant chemotherapy is necessary to obtain improved surgical results for the high risk group. There was a total of 21 non-curative resection cases among which distant metastases were observed. Cases of early gastric cancer exist which are beyond help by surgical means.