• Huayi Li, Zikun Peng, Jianqing Zhu, Weidong Zhao, Yi Huang, Ruifang An, Hong Zheng, Pengpeng Qu, Li Wang, Qi Zhou, Danbo Wang, Ge Lou, Jing Wang, Ke Wang, Beihua Kong, Xing Xie, Rutie Yin, John Low, Abdul Malik Rozita, Lim Chun Sen, Yong Chee Meng, Kho Swee Kiong, Jihong Liu, Zhiqing Liang, Weiguo Lv, Yaping Zhu, Weiguo Hu, Wei Sun, Jingya Su, Qiqi Wang, Rongyu Zang, Ding Ma, and Qinglei Gao.
• Department of Obstetrics and Gynaecology, National Clinical Research Centre for Obstetrics and Gynaecology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1095 Jiefang Avenue, Hankou, Wuhan, 430030, China.
• Bmc Med. 2024 May 16; 22 (1): 199199.

BackgroundThe prospective phase III multi-centre L-MOCA trial (NCT03534453) has demonstrated the encouraging efficacy and manageable safety profile of olaparib maintenance therapy in the Asian (mainly Chinese) patients with platinum-sensitive relapsed ovarian cancer (PSROC). In this study, we report the preplanned exploratory biomarker analysis of the L-MOCA trial, which investigated the effects of homologous recombination deficiency (HRD) and programmed cell death ligand 1 (PD-L1) expression on olaparib efficacy.MethodsHRD status was determined using the ACTHRD assay, an enrichment-based targeted next-generation sequencing assay. PD-L1 expression was assessed by SP263 immunohistochemistry assay. PD-L1 expression positivity was defined by the PD-L1 expression on ≥ 1% of immune cells. Kaplan-Meier method was utilised to analyse progression-free survival (PFS).ResultsThis exploratory biomarker analysis included 225 patients and tested HRD status [N = 190; positive, N = 125 (65.8%)], PD-L1 expression [N = 196; positive, N = 56 (28.6%)], and BRCA1/2 mutation status (N = 219). The HRD-positive patients displayed greater median PFS than the HRD-negative patients [17.9 months (95% CI: 14.5-22.1) versus 9.2 months (95% CI: 7.5-13.8)]. PD-L1 was predominantly expressed on immune cells. Positive PD-L1 expression on immune cells was associated with shortened median PFS in the patients with germline BRCA1/2 mutations [14.5 months (95% CI: 7.4-18.2) versus 22.2 months (95% CI: 18.3-NA)]. Conversely, positive PD-L1 expression on immune cells was associated with prolonged median PFS in the patients with wild-type BRCA1/2 [20.9 months (95% CI: 13.9-NA) versus 8.3 months (95% CI: 6.7-13.8)].ConclusionsHRD remained an effective biomarker for enhanced olaparib efficacy in the Asian patients with PSROC. Positive PD-L1 expression was associated with decreased olaparib efficacy in the patients with germline BRCA1/2 mutations but associated with improved olaparib efficacy in the patients with wild-type BRCA1/2.Trial RegistrationNCT03534453. Registered at May 23, 2018.© 2024. The Author(s).

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