ectiveTo investigate the expression of ER, PR, HER-2, PCNA and P53 in breast cancer patients in Shanghai and the relevant clinical significance.MethodsExpressions of ER, PR, HER-2, PCNA and P53 in the breast cancer tissues of 544 patients in Shanghai were detected by immunohistochemistry methods.Statistical analysis was applied to analyze the relationship of these immunohistochemical indices with the clinicopathological features of breast cancer.ResultsThe positive rates of ER, PR, HER-2, PCNA and P53 in the breast cancer tissues of 544 patients were 62.2%, 57.2%, 15.1%, 82.6% and 58.5%, respectively.The expressions of ER, PCNA and P53 were correlated with the tumor size (P<0.05, P<0.01).The expressions of HER-2 and PCNA were correlated with axillary lymphatic metastasis (P<0.05, P<0.01).ER expression was positively correlated with PR expression(r=0.452,P=0.000) and PR expression was positively correlated with P53 expression(r=0.520,P=0.03).The 123 (22.6%) patients with triple-negative breast cancer (TNBC) had a higher axillary lymphatic positive rate than patients with non-TNBC(P<0.01).Co-expression of HER-2 with PCNA and co-expression of HER-2 with P53 were positively correlated with lymphatic metastasis (P<0.05).ConclusionPopulation aging has a influence on the immunohistochemical characteristics of breast cancer patients patients in Shanghai.Combined examination of ER, PR, HER-2, PCNA and P53 is of clinical significance in the diagnosis, treatment, and prognosis prediction of breast cancer patients.