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Chao A, Chang TC, Lapke N, Jung SM, Chi P, Chen CH, Yang LY, Lin CT, Huang HJ, Chou HH, Liou JD, Chen SJ, Wang TH, Lai CH. Prevalence and clinical significance of BRCA1/2 germline and somatic mutations in Taiwanese patients with ovarian cancer. Oncotarget 2018; 7:85529-85541. [PMID: 27907908 PMCID: PMC5356755 DOI: 10.18632/oncotarget.13456] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2016] [Accepted: 10/28/2016] [Indexed: 12/27/2022] Open
Abstract
Germline and somatic BRCA1/2 mutations define a subset of patients with ovarian cancer who may benefit from treatment with poly (ADP-ribose) polymerase inhibitors. Unfortunately, data on the frequency of BRCA1/2 germline mutations in Taiwanese patients with ovarian cancer are scarce, with the prevalence of somatic mutations being unknown. We aim to investigate the occurrence of BRCA1/2 mutations in 99 Taiwanese patients with ovarian cancer which included serous (n = 46), endometrioid (n = 24), and clear cell (n = 29) carcinomas. BRCA1/2 mutations were identified using next-generation sequencing of formalin-fixed paraffin-embedded tumor samples. Pathogenic variants (BRCA1: n = 7; BRCA2: n = 6) were detected in 12.1% (12/99) of the study patients. Somatic and germline BRCA1/2 mutation rates in serous ovarian cancer are 4/46 (8.7%) and 8/46 (17%), respectively. All of the pathogenic BRCA1/2 mutations were identified in serous carcinoma samples (12/46; 26.1%). One-third (4/12) of the deleterious BRCA1/2 mutations occurred in tumor tissues only (somatic mutations). All of them coexisted with loss of heterozygosity, resulting in biallelic BRCA inactivation. Five novel pathogenic mutations were identified, including four somatic variants (BRCA1 p.S242fs, BRCA1 p.F989fs, BRCA1 p.G1738fs, and BRCA2 p.D1451fs) and a germline variant (BRCA2 p.E260fs). We also detected additional six novel mutations (three in BRCA1 and three in BRCA2) with pathogenic potentials. We conclude that BRCA1/2 mutations are common in Taiwanese patients with serous ovarian carcinoma and similar to mutation rates in other ethnic groups. The analysis of BRCA1/2 somatic mutations is crucial for guiding therapeutic decisions in ovarian cancer.
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Affiliation(s)
- Angel Chao
- Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital, Linkou Medical Center, Taoyuan, Taiwan.,Gynecologic Cancer Research Center, Chang Gung Memorial Hospital, Taoyuan, Taiwan
| | - Ting-Chang Chang
- Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital, Linkou Medical Center, Taoyuan, Taiwan.,Gynecologic Cancer Research Center, Chang Gung Memorial Hospital, Taoyuan, Taiwan
| | | | - Shih-Ming Jung
- Department of Pathology, Chang Gung Memorial Hospital, Linkou Medical Center, Taoyuan, Taiwan
| | - Peter Chi
- Institute of Biochemical Sciences, College of Life Science, National Taiwan University, Taiwan
| | | | - Lan-Yan Yang
- Clinical Trial Center, Chang Gung Memorial Hospital, Taoyuan, Taiwan
| | - Cheng-Tao Lin
- Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital, Linkou Medical Center, Taoyuan, Taiwan.,Gynecologic Cancer Research Center, Chang Gung Memorial Hospital, Taoyuan, Taiwan
| | - Huei-Jean Huang
- Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital, Linkou Medical Center, Taoyuan, Taiwan.,Gynecologic Cancer Research Center, Chang Gung Memorial Hospital, Taoyuan, Taiwan
| | - Hung-Hsueh Chou
- Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital, Linkou Medical Center, Taoyuan, Taiwan.,Gynecologic Cancer Research Center, Chang Gung Memorial Hospital, Taoyuan, Taiwan
| | - Jui-Der Liou
- Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital, Linkou Medical Center, Taoyuan, Taiwan.,Gynecologic Cancer Research Center, Chang Gung Memorial Hospital, Taoyuan, Taiwan
| | | | - Tzu-Hao Wang
- Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital, Linkou Medical Center, Taoyuan, Taiwan.,Gynecologic Cancer Research Center, Chang Gung Memorial Hospital, Taoyuan, Taiwan.,School of Traditional Chinese Medicine, College of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - Chyong-Huey Lai
- Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital, Linkou Medical Center, Taoyuan, Taiwan.,Gynecologic Cancer Research Center, Chang Gung Memorial Hospital, Taoyuan, Taiwan
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