A Study of Sacituzumab Tirumotecan (MK-2870) as a Single Agent and in Combination With Pembrolizumab (MK-3475) Versus Treatment of Physician's Choice in Participants With HR+/HER2- Unresectable Locally Advanced or Metastatic Breast Cancer (MK-2870-010) Neoplasms by Site, Skin and Connective Tissue Diseases, autosomal dominant Parkinson disease 4, breast disorder, breast neoplasm, neoplasm, skin disorder Recruiting Phase 3 2026-10-06 NCT06312176 Study of Opevesostat (MK-5684) Versus Alternative NHA in mCRPC (MK-5684-003) metastatic prostate carcinoma Recruiting Phase 3 2026-10-06 NCT06136624 A Study of Niraparib in Combination With Abiraterone Acetate and Prednisone Versus Abiraterone Acetate and Prednisone for the Treatment of Participants With Deleterious Germline or Somatic Homologous Recombination Repair (HRR) Gene-MutatedProstatic Neoplasms (mCSPC) Genital Diseases, Male Urogenital Diseases, Neoplasms by Site, Urogenital Diseases, Urogenital Neoplasms, male reproductive organ cancer, male reproductive system disorder, neoplasm, prostate cancer, prostate disorder Active, not recruiting Phase 3 2026-09-28 NCT04497844 A Study of Neoadjuvant Chemotherapy Plus Nivolumab Versus Neoadjuvant Chemotherapy Plus Placebo, Followed by Surgical Removal and Adjuvant Treatment With Nivolumab or Placebo for Participants With Surgically Removable Early Stage Non-small Cell Lung Cancer Neoplasms by Site, Thoracic Neoplasms, bronchial neoplasm, bronchogenic carcinoma, lung disorder, lung neoplasm, neoplasm, non-small cell lung carcinoma, respiratory system disorder, respiratory tract neoplasm Active, not recruiting Phase 3 2026-08-26 NCT04025879 Durvalumab With Stereotactic Body Radiation Therapy (SBRT) vs Placebo With SBRT in Early Stage Unresected Non-small Cell Lung Cancer (NSCLC) Patients/ Osimertinib Following SBRT in Patients With Early Stage Unresected NSCLC Harboring an EGFR Mutation Neoplasms by Site, Thoracic Neoplasms, bronchial neoplasm, bronchogenic carcinoma, lung disorder, lung neoplasm, neoplasm, non-small cell lung carcinoma, respiratory system disorder, respiratory tract neoplasm Active, not recruiting Phase 3 2026-07-20 NCT03833154