New drug cocktail aims to shrink ovarian tumors before surgery

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Participants voluntarily join this study, sign the informed consent form, and strictly comply with the protocol requirements; * Female patients aged between 18 and 75 years; * Patients who have undergone open surgery, laparoscopic surgery, or core needle aspiration biopsy, and have been histopathologically confirmed as having epithelial ovarian cancer (high-grade serous adenocarcinoma, endometrioid adenocarcinoma), peritoneal cancer, or fallopian tube cancer, FIGO 2018 Stage III-IV; * Meet the indications for neoadjuvant chemotherapy in ovarian cancer: ① Preoperative assessment by gynecologic oncologists (with multidisciplinary consultation when necessary) indicates low likelihood of achieving R0 resection with primary debulking surgery; ② Physical condition unable to tolerate PDS, unsuitable for immediate surgery (e.g., high perioperative risk, advanced age, medical comorbidities, etc.); ③ No prior systemic anti-tumor treatment for ovarian cancer (including but not limited to radiotherapy, chemotherapy, surgery, targeted therapy, and immunotherapy); Note: Lymph node dissection or biopsy performed for clinical staging purposes after obtaining histopathology via needle biopsy, laparoscopic exploration, or other methods is permitted; * Accept BRCA1/2 genetic mutation or HRD testing; * Presence of at least one measurable lesion according to RECIST 1.1 criteria; * Expected survival time ≥12 weeks; * ECOG score 0-1 (for Cohort 1), ECOG score 2 (for Cohort 2); * Adequate organ function, including: Bone marrow function: Absolute neutrophil count ≥1,500/μL; Platelets ≥100,000/μL; Hemoglobin ≥10 g/dL Hepatic function: Total bilirubin ≤1.5× upper limit of normal (ULN) or direct bilirubin ≤1.0× ULN; AST and ALT ≤2.5× ULN; Must be ≤5× ULN when liver metastases are present Renal function: Serum creatinine ≤1.5× ULN, or creatinine clearance ≥60 mL/min (calculated using the Cockcroft-Gault formula); * Participants of childbearing potential must use appropriate contraceptive methods during the study period and for 120 days after study completion, have a negative serum pregnancy test within 7 days before study enrollment, and must be non-lactating participants. Exclusion Criteria: * Non-epithelial origin ovarian cancer, fallopian tube cancer, or primary peritoneal cancer (e.g., germ cell tumors); ovarian tumors of low malignant potential (e.g., borderline tumors); * Concurrent use of other cancer neoadjuvant therapies during this study, including but not limited to chemotherapy, radiotherapy, immunotherapy, microbial therapy, traditional Chinese medicine, and other experimental therapies; * Hypersensitivity to the active or inactive ingredients of the investigational drug or drugs with similar structure to the investigational drug; * Inability to swallow oral medications and any gastrointestinal disorders that may interfere with the absorption and metabolism of study drugs (for Cohort 2); * Prior treatment with known or suspected poly (ADP-ribose) polymerase (PARP) inhibitors (for Cohort 2); * Presence of symptomatic or uncontrolled brain metastases requiring concurrent treatment; * Active or potentially recurrent autoimmune disease; exceptions include: vitiligo, alopecia, psoriasis, or eczema not requiring systemic treatment; hypothyroidism caused by autoimmune thyroiditis requiring only stable dose hormone replacement therapy; Type 1 diabetes requiring only stable dose insulin replacement therapy; * Major surgery within 3 weeks before study initiation, or incomplete recovery from surgery; * History of organ transplantation, autologous/allogeneic stem cell transplantation; * Known or self-reported human immunodeficiency virus (HIV) infection; * HBV-DNA positive, HCV-DNA positive (copy number \>10³); * Prior treatment with immune checkpoint inhibitors (e.g., anti-PD-1 antibody, anti-PD-L1 antibody, anti-CTLA-4 antibody, etc.), immune checkpoint agonists (e.g., antibodies targeting ICOS, CD40, CD137, GITR, OX40, etc.), immune cell therapy, or any other treatments targeting tumor immune mechanisms; * Live vaccine administered within 4 weeks before first dose, or planned live vaccine administration during the study period; * History of other malignancies within the past 3 years, except for cutaneous squamous cell carcinoma, basal cell carcinoma, ductal carcinoma in situ of the breast, or cervical carcinoma in situ; * Prior or current diagnosis of myelodysplastic syndrome (MDS) or acute myeloid leukemia (AML); * Patients who received platelet or red blood cell transfusions within 4 weeks before initiation of study drug treatment; * Pregnant, lactating, or patients planning to become pregnant during study treatment; * Patients deemed unsuitable for participation in this study by the investigator.