This is a prospective, open-label, single-arm, multicenter exploratory clinical study designed to evaluate the efficacy and safety of iparomlimab/tuvonralimab (QL1706), a bispecific antibody targeting programmed cell death protein 1 (PD-1) and cytotoxic T-lymphocyte-associated protein 4 (CTLA-4), in combination with standard platinum-based chemotherapy followed by olaparib in patients with platinum-sensitive recurrent epithelial ovarian cancer. Eligible participants are women aged 18-75 years with histologically or cytologically confirmed non-mucinous epithelial ovarian cancer (including serous carcinoma, clear cell carcinoma, endometrioid carcinoma, and carcinosarcoma) who experience first or second recurrence at least 6 months after the last platinum-containing chemotherapy, have measurable disease per Response Evaluation Criteria in Solid Tumors, version 1.1 (RECIST v1.1), an Eastern Cooperative Oncology Group performance status (ECOG PS) of 0-1, and are deemed not suitable for surgery by the investigator. The study consists of a screening period (up to 28 days), a treatment period, and a follow-up period. Treatment is administered in 3-week cycles and continues until disease progression, unacceptable toxicity, withdrawal of consent, loss of clinical benefit per investigator judgment, completion of 2 years of iparomlimab/tuvonralimab (QL1706), or other protocol-defined reasons. Safety assessments are performed regularly during treatment; a safety follow-up visit is conducted 30 (±7) days after the last dose, and survival follow-up is performed every 2 months thereafter. The primary objective is to explore the antitumor efficacy of the regimen in platinum-sensitive recurrent epithelial ovarian cancer, and the secondary objective is to characterize the safety profile of the combination strategy.
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Progression-Free Survival (PFS)
Timeframe: Up to 24 months