BRCA2 mutations should be screened early and routinely as markers of poor prognosis: evidence from 8,988 patients with prostate cancer

// Ming Cui 1 , Xian-Shu Gao 1 , Xiaobin Gu 1 , Wei Guo 2 , Xiaoying Li 1 , Mingwei Ma 1 , Shangbin Qin 1 , Xin Qi 1 , Mu Xie 1 , Chuan Peng 1 and Yun Bai 1 1 Department of Radiation Oncology, Peking University First Hospital, Peking University, Beijing, China 2 Graduate School of Medicine, Hebei North University, Zhangjiakou, Hebei, China Correspondence to: Xian-Shu Gao, email: doctorgaoxs@126.com Keywords: BRCA2, mutation, prostate cancer, survival, molecular classification Received: January 23, 2017 Accepted: March 21, 2017 Published: March 30, 2017 ABSTRACT The aim of this study was to focus on clinicopathological characteristics and prognosis in men with prostate cancer (PCa) harboring a breast cancer 2 ( BRCA2 ) gene mutation and to offer convincing evidence to consider BRCA2 mutation as a marker of poor prognosis in the molecular classification of PCa. We searched relevant articles from PubMed, Embase, Web of Science, and the Cochrane Library databases to evaluate the differences in the overall survival (OS) and cancer-specific survival (CSS) between BRCA2 mutation carriers and non-carriers in patients with PCa. We included 525 BRCA2 mutation-carriers and 8,463 non-carriers in total from 10 studies in our meta-analysis. The results showed that carrying a BRCA2 mutation was correlated with a reduced CSS and OS when compared with that of non-carriers, with pooled Hazard Ratios (HRs) of 2.53 (95% confidence interval (CI): 2.10–3.06, P < 0.001) and 2.21 (95% CI: 1.64–2.99, P < 0.001), respectively. The results also demonstrated that BRCA2 mutation-carriers harbored a higher Gleason Score (GS) (> 7), TNM stage (> T3, N1, M1), and risk level than non-carriers. Our meta-analysis showed that a BRCA2 mutation predicted poor survival outcomes in patients with prostate cancer, especially in those undergoing treatments with radiotherapy. Therefore, the use of BRCA2 mutation as a clinical prognostic factor could help stratify the high-risk patients and provide clinical strategies for more effective targeted treatments for patients with prostate cancer.