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Poster and E-Posters
06. Ovarian cancer
1348 Translational biomarkers of response to triplet maintenance in BRCA wildtype recurrent ovarian cancer: OPEB-01/APGOT-OV4
  1. Yoo-Na Kim1,
  2. Boram Park2,
  3. Jae Weon Kim3,
  4. Byoung Gie Kim4,
  5. Sang Wun Kim1,
  6. Hee Seung Kim3,
  7. Chel Hun Choi4,
  8. Myong Cheol Lim5,
  9. Natalie Yl Ngoi6,
  10. David Sp Tan6 and
  11. Jung-Yun Lee1
  1. 1Department of Obstetrics and Gynecology, Yonsei University College of Medicine, Seoul, South Korea
  2. 2Biomedical Statistics Center, Research Institute for Future Medicine, Samsung Medical Center, Seoul, South Korea
  3. 3Department of Obstetrics and Gynecology, Seoul National University, Seoul, South Korea
  4. 4Department of Obstetrics and Gynecology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
  5. 5Gynecologic Cancer Branch and Center for Uterine Cancer, National Cancer Center, Goyang, South Korea
  6. 6Department of Haematology-Oncology, National University Cancer Institute, Singapore, Singapore

Abstract

Introduction/Background OPEB-01/APGOT-OV4 was a phase II clinical trial that investigated the efficacy and safety of triplet maintenance (olaparib, pembrolizumab, and bevacizumab) in BRCA wildtype, platinum-sensitive recurrent ovarian cancer. Here, we report the impact of biomarker status (PD-L1 and HRD status) on therapeutic outcomes.

Methodology Patients showing a complete or partial response after second-line platinum-based chemotherapy were eligible. The primary endpoint was the 6 months progression-free survival (PFS) rate, with secondary endpoints including PFS, overall survival (OS), and safety. As pre-specified exploratory analysis, biomarkers such as PD-L1 and HRD were investigated.

Results The primary endpoint was met, with 6 months PFS rate of 88.6% (95% CI 69.3–92.0). The median PFS was 22.4 months (20.4–∞), and the 12-months PFS rate of 84.0% (95% CI 69.3–92.0), indicating durable responses. Patient demographics were not different with respect to PD-L1 or HRD status. Out of 43 patients with available PD-L1 status, 28 patients had PD-L1 positive tumors (combined positive score [CPS] ≥ 1), while 15 had PD-L1 negative tumors (CPS <1). PD-L1 positive patients exhibited significantly better PFS and OS compared to the PD-L1 negative patients. Median PFS were 18.6 months (16.3 to ∞) in the PD-L1 negative and not reached (27.7 to ∞) in the PD-L1 positive group (p=0.0008). Out of 42 patients with available HRD status, 24 patients were HRD positive and 18 were negative. HRD positive patients exhibited significantly better PFS compared to the HRD negative patients. Median PFS were 27.7 months (21.2 to ∞) in the HRD positive and 21.8 (17.1 to ∞) in the HRD negative group (p=0.043).

Conclusion PD-L1 positive and HRD positive status were each associated with a superior response to triplet maintenance therapy.

Disclosures None.

Abstract 1348 Figure 1
Abstract 1348 Figure 1

https://doi.org/10.1136/ijgc-2024-ESGO.836

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