The purpose of this study is to test whether combining two investigational study drugs, DB-1311 with BNT327 or DB-1311 with DB-1305, is safe and can be tolerated by participants with advanced or metastatic solid tumors. The study will also test how much of the study drugs are in the blood at different times, if the body makes antibodies against the study drugs, and how the study drugs affect the disease. Additionally, the study may also explore how certain molecules in the blood or tissue (biomarkers) relate to the drug's effects. DB-1311, BNT327, and DB-1305 are investigational drugs,...