PLD

This study will evaluate the safety and efficacy of R-DXd therapy in participants with ovarian, peritoneal, or fallopian tube cancer.

An open, multicenter, dose-exploring Phase I trial include Part A and Part B to evaluate the safety, tolerability and efficacy of APG-2449.

This Phase 3 study will be conducted in different countries around the world with up to about 688 participants. The purpose of this study is to evaluate how well Rina-S works against ovarian cancer in combination with or without bevacizumab and how it compares to an investigator's choice of platinum-based chemotherapy with or without bevacizumab. Participants will receive either: * Rina-S monotherapy (by itself), * Rina-S plus bevacizumab, * investigator's choice chemotherapy (by itself) (standard of care), or * investigator's choice chemotherapy plus bevacizumab (standard of care). No participants will be given placebo. Participants will participate in 1 of 2 arms. The treatment duration will be different for every participant. If a participant's cancer stays the same or gets better, and there are not any serious problems, participants can keep getting study treatment for as long as the study is open. Participants will be asked to attend 1 to 3 visits at the study clinic for each cycle (duration of cycle is 3 or 4 weeks, depending on medication received). During visits, there will be various tests (such as blood draws) and procedures (such as recording of heart activity and imaging) to monitor whether the study treatment is safe and effective. The overall study duration (including screening, treatment, and follow-up) will be different for every participant.

This study is researching an experimental drug called ubamatamab, also referred to as "study drug". The study is focused on patients who have advanced ovarian cancer. The aim of the study is to see how safe, tolerable, and effective the study drug is on its own and in combination with other anti-cancer drugs (bevacizumab, cemiplimab, fianlimab and a standard chemotherapy drug, pegylated liposomal doxorubicin \[PLD\]), referred to as "combination drugs'. The study is looking at several other research questions, including: * What side effects may happen from taking the study drug and its experimental combinations * How much study drug and fianlimab is in the blood at different times * Whether the body makes antibodies against the study drug (which could make the drug less effective or could lead to side effects) and its combinations