[Analysis of prognostic factors of node negative breast cancer]

Prognostic factors of 229 patients with node negative breast cancer were analysed using Cox's proportional hazard regression model. From 11 pathological factors, four factors nuclear grade, pectoral invasion, fat infiltration and tumor size were selected under condition of p less than 0.05. When the three factors (moderate or poorly differentiated nuclear grade, marked fatty infiltration and tumor size 2 cm) were provided as poor prognostic factors, node negative breast cancer was successfully classified from the number of the poor prognostic factors: namely, the recurrence rate of subgroups with the number of 0,1,2,3 was 2%, 7%, 21%, 39%, respectively.