新辅助化疗对乳腺癌 ER, PR, Her - 2 和 Ki - 67表达的影响及临床意义

Effect and clinical significance of neoadjuvant chemotherapy on expressions of ER, PR, Her - 2 and Ki - 67 in breast cancer

Background: The present study was designed in an attempt to determine the influence of neoadjuvant chemotherapy on estrogen receptor (ER), progesterone receptor (PR) , human epidermal growth factor receptor 2 (Her-2) and Ki-67 expression in patients with breast cancer.Method: Pre- and post-neodjuvant chemotherapy, paired-tumor specimens from 103 patients with breast cancer administrated with anthracycline or anthracycline combining taxane regimen were collected. Immunohistochemical staining for ER, PR, Her-2 and Ki67 was performed by the DAKO envision method. Results: Among all the 103 cases, 5 patients (4.9%) had a complete response, 82 (79.6%) partial response (PR), 15 (14.6%) stable disease (SD), and 1 (0.9%) progressive disease (PD), yielding an overall response rate (CR PR) of 84.5%. Nine patients achieve pathological complete response. There is a significant decrease of the average index of Ki-67 post-neoadjuvant chemotherapy, compared with that before chemotherapy (24.1% vs 39.7%, P<0.001). After neoadjuvant chemotherapy, the change of Ki-67 in different subtypes breast cancer were difference (P<0.001), and the changes of Ki-67 was correlated with response to neoadjuvant chemotherapy (P<0.001). No significant changes in Immunohistochemical expression were observed for ER,PR or Her-2.Conclusion: Neoadjuvant chemotherapy apparently reduced Ki-67 index in primary breast carcinomas, but profiles for ER,PR and Her-2 were not significantly different before and after neoadjuvant chemotherapy. The change of Ki-67 was correlated with molecular subtypes, and was correlated with response to neoadjuvant chemotherapy, suggesting that Ki-67 index is a surrogate marker to predict the treatment response of neoadjuvant chemotherapy.