A Study to Evaluate the Efficacy and Safety of Sacituzumab Tirumotecan (MK-2870) Maintenance Treatment Versus Standard of Care in Participants With Platinum-sensitive Recurrent Ovarian Cancer (MK-2870-022/TroFuse-022/ENGOT-ov84/GOG-3103)

Open to females ages 18 years and up

• Has histologically confirmed Federation of Gynecology and Obstetrics (FIGO) Stage III or IV epithelial ovarian, primary peritoneal, or fallopian tube carcinoma of certain histologies
• Has received 4 or more cycles of platinum-based doublet chemotherapy in first-line and a total of 6 cycles of carboplatin-based doublet chemotherapy in second-line setting for ovarian cancer (OC)
• Has platinum-sensitive epithelial OC
• Has provided tissue of a tumor lesion that was not previously irradiated
• Human immunodeficiency virus (HIV)-infected participants must have well controlled HIV on antiretroviral therapy
• Participants who are hepatitis B surface antigen positive are eligible if they have received hepatitis B virus (HBV) antiviral therapy for at least 4 weeks, and have undetectable HBV viral load prior to allocation (Part 1) or randomization (Part 2)
• Participants with a history of hepatitis C virus (HCV) infection are eligible if HCV viral load is undetectable at screening
• Has an ECOG performance status of 0 or 1 assessed within 7 days before allocation (Part 1) or randomization (Part 2)

• Has nonepithelial cancers (germ cell tumors and sex cord-stromal tumors), low-grade serous tumors, low-grade endometrioid tumors, borderline tumors (low malignant potential), mucinous, seromucinous that is predominantly mucinous, malignant Brenner's tumor and undifferentiated carcinoma
• Has platinum-resistant OC or platinum-refractory OC
• Has history of documented severe dry eye syndrome, severe Meibomian gland disease and/or blepharitis, or severe corneal disease that prevents/delays corneal healing
• Has active inflammatory bowel disease requiring immunosuppressive medication or previous history of inflammatory bowel disease (e.g. Crohn's disease, ulcerative colitis, or chronic diarrhea)
• Has uncontrolled, significant cardiovascular disease or cerebrovascular disease
• Has a history of (noninfectious) pneumonitis/interstitial lung disease (ILD) that required steroids or has current pneumonitis/ILD
• HIV-infected participants with a history of Kaposi's sarcoma and/or Multicentric Castleman's Disease
• Has received more than 2 prior lines of systemic therapy for OC
• Has received prior systemic anticancer therapy within 3 weeks or 5 half-lives (whichever is shorter) before allocation (Part 1) or randomization (Part 2)
• Has received prior radiotherapy within 2 weeks of allocation (Part 1) or randomization (Part 2), or has radiation related toxicities, requiring corticosteroids
• Has an additional malignancy that is progressing or has required active treatment within the past 3 years
• Has active central nervous system (CNS) metastases and/or carcinomatous meningitis
• Has an active infection requiring systemic therapy
• Has active or ongoing stomatitis