Objective:The aim of this study was to determine the expression of p21waf1, c erbB 2, and p53 in node negative breast cancer in relation to the clinicopathological parameters and prognosis. Methods: Expression of p21waf1, c erbB 2 and p53 in 121 patients were determined by LSAB immunohistochemical method, and Kaplan Meier method and Cox proportional hazard model were used to analyze the relationship of their expressions with prognosis. Results: (1) The expression rate of p21waf1 was 48.8% , and was in connection with histologica...