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Abstract

Volume 19, Issue 2 (March 2017) 19, 196–202; DOI:10.4103/1008-682X.178483

Indirect comparison between abiraterone acetate and enzalutamide for the treatment of metastatic castration-resistant prostate cancer: a systematic review

Wei Zhang1, Teng-Yun Wu2, Qi Chen3, Xiao-Lei Shi1, Guang-An Xiao1, Lin Zhao1, Chuan-Liang Xu1, Tie Zhou1, Ying-Hao Sun1

1 Department of Urology, Changhai Hospital, Second Military Medical University, Shanghai, China
2 Air Force General Hospital of Chinese People's Liberation Army, Beijing, China
3 Department of Health Statistics, Faculty of Health Service, Second Military Medical University, Shanghai, China

Correspondence: Prof. YH Sun (sunyh@medmail.com.cn) or Prof. T Zhou (wenzhoutie@163.com)

Date of Submission 25-Jul-2015 Date of Decision 06-Dec-2015 Date of Acceptance 23-Feb-2016 Date of Web Publication 20-May-2016

Abstract

This study was designed to evaluate the efficacy, tolerability, and sequential administration of abiraterone acetate (AA) and enzalutamide (Enz) for metastatic castration-resistant prostate cancer (mCRPC). A literature search was performed with PubMed, Embase, and Web of Science databases to identify relevant studies. Reviewed literature included published phase III trials of AA or Enz in mCRPC and studies regarding their sequential administration. Given the difference in control arms in AA (active comparator) and Enz (true placebo) randomized phase III studies, indirect comparisons between AA and Enz in mCRPC showed no statistically significant difference in overall survival in prechemotherapy and postchemotherapy settings (HR: 0.90, 95% CI, 0.73-1.11; HR: 0.85, 95% CI, 0.68-1.07). Compared with AA, Enz may better outperform control arms in treating mCRPC both before and after chemotherapy regarding secondary endpoints based on indirect comparisons: time to prostate-specific antigen (PSA) progression (HR: 0.34, 95% CI, 0.28-0.42; HR: 0.40, 95% CI, 0.30-0.53), radiographic progression-free survival (HR: 0.37, 95% CI, 0.28-0.48; HR: 0.61, 95% CI, 0.50-0.74), and PSA response rate (OR: 18.29, 95% CI, 11.20-29.88; OR: 10.69, 95% CI, 3.92-29.20). With regard to the effectiveness of Enz following AA or AA following Enz, recent retrospective case series reported overall survival and secondary endpoints for patients with mCRPC progression after chemotherapy. However, confirmatory head-to-head trials are necessary to determine the optimal sequencing of these agents.

Keywords: abiraterone acetate; enzalutamide; indirect comparison; metastatic castration-resistant prostate cancer; sequential therapy

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