Investigation of Ubamatamab Combination Therapy in Adult Participants With Platinum-Resistant Ovarian Cancer

Key Who May Qualify: 1. Participants with diagnosed by tissue sample (biopsy-confirmed) diagnosis of advanced serous or endometrioid ovarian (regardless of the grade), primary peritoneal, or fallopian tube cancer (clear cell, mucinous, and carcinosarcoma are excluded) 2. Must have progression on prior therapy documented radiographically and must have at least 1 measurable lesion (not previously irradiated) that can be accurately measured by RECIST 1.1 3. Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1 4. Adequate organ and bone marrow function, as described in the protocol 5. Platinum-Resistant Ovarian Cancer, as described in the protocol Key Who Should NOT Join This Trial: 1. Major surgical procedure or significant traumatic injury within 4 weeks prior to first dose of study intervention(s) 2. Documented allergic or acute hypersensitivity reaction attributed to antibody treatments or doxorubicin hydrochloride or components of study intervention(s) 3. Another malignancy that is progressing or requires active treatment, as described in the protocol 4. Untreated or active Central Nervous System (CNS) metastases, or carcinomatous meningitis, as described in the protocol 5. Uncontrolled infections including but not limited to human weakened immune system virus, hepatitis B or hepatitis C infection, or diagnosis of weakened immune system 6. Moderate to large or ascites, as described in the protocol 7. Bowel obstruction within last 3 months or current need for parenteral nutrition NOTE: Other protocol-defined inclusion/exclusion criteria apply Always talk to your doctor about whether this trial is right for you.