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ERCC1 (excision repair cross-complementation group 1) expression as a predictor for response of neoadjuvant
Jong-Sup Park1, Eun Kyung Jeon, Sang Hoon Chun
1Department of Obstetrics and Gynecology, Gynecologic Cancer Multidisciplinary team, Seoul St. Mary's Hospital, College of Medicine, Catholic University of Korea, Seoul, Republic of Korea.
Objective:
Platinum-based neoadjuvant chemotherapy for locally advanced cervical cancer has some benefits for patients responding to chemotherapy. However, no validated clinical or biologic predictor of response to this chemotherapy has been identified to date.
Methods:
We employ immunohistochemical analysis to determine the expression patterns of the excision repair cross-complementation group1 (ERCC1) protein in pre-treatment cervical biopsy tissue. In total, 43 stage IIB patients had been enrolled in a previous etoposide and cisplatin neoadjuvant phase II clinical trial, allowing comparison of the effects of cisplatin-based neoadjuvant chemotherapy on response in relation to ERCC1 expression.
Results:
Among the 43 patients studied, 34 (79.1%) were positive and 9 (20.9%) were negative for ERCC1. Response to chemotherapy (according to RECIST criteria) was observed in all patients with negative ERCC1 expression. In logistic regression analysis, ERCC1 negativity continued to be an independent predictor for responsiveness to neoadjuvant chemotherapy (p=0.021). Among the pretreatment factors, low ERCC1 expression was a significant prognostic factor of disease-free survival in multivariate analysis (p=0.046).
Conclusions:
The ERCC1 expression patterns in pretreatment specimens may thus facilitate the prediction of responses to cisplatin-based NAC. We propose that patients expressing low levels of ERCC1 derive the most benefit from cisplatin-based NAC.