The main purpose of this study is to: * Learn about the safety of ubamatamab and to find out what dose of ubamatamab can be given alone or with cemiplimab to patients with ovarian cancer or cancer of the uterus * The study will also look at the levels of ubamatamab and/or cemiplimab in the body and measure how well the body can remove the study drug(s). This is called pharmacokinetics * The study will also look at any signs that ubamatamab alone or with cemiplimab can treat recurrent advanced ovarian cancer or cancer of the uterus * To find out how safe and tolerable pretreatment is in combination with ubamatamab and to see how well it works to prevent or minimize Cytokine Release Syndrome (CRS)
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Number of participants with Dose-limiting toxicity (DLTs) for ubamatamab monotherapy
Timeframe: From Cycle 1, Day 1 up to 35 days
Number of participants with DLTs for ubamatamab with cemiplimab
Timeframe: From Cycle 2, Day 1 up to 21 days
Number of participants with Treatment-emergent adverse event (TEAE)s (including immune-related adverse events (imAEs)) for ubamatamab monotherapy
Timeframe: Up to 2 years
Number of participants with TEAEs (including imAEs) for ubamatamab with cemiplimab
Timeframe: Up to 2 years
Number of participants with serious adverse events (SAEs) for ubamatamab monotherapy
Timeframe: Up to 2 years
Number of participants with SAEs for ubamatamab with cemiplimab
Timeframe: Up to 2 years
Number of deaths for ubamatamab monotherapy
Timeframe: Up to 2 years
Number of deaths for ubamatamab with cemiplimab
Timeframe: Up to 2 years
Number of participants with laboratory abnormalities (grade 3 or higher per Common Terminology Criteria for Adverse Events [CTCAE]) for ubamatamab monotherapy
Timeframe: Up to 2 years
Number of participants with laboratory abnormalities (grade 3 or higher per CTCAE) for ubamatamab with cemiplimab
Timeframe: Up to 2 years
Concentration of ubamatamab in serum over time for ubamatamab monotherapy
Timeframe: Up to 2 years
Concentration of ubamatamab in serum over time for ubamatamab with cemiplimab
Timeframe: Up to 2 years
Objective response rate (ORR) defined by Response Evaluation Criteria in Solid Tumors (RECIST 1.1) for ubamatamab monotherapy
Timeframe: Up to 2 years
ORR defined by RECIST 1.1 for ubamatamab with cemiplimab
Timeframe: Up to 2 years