DESTINY-Endometrial01: An Open-Label, Sponsor-Blinded, Randomized, Controlled, Multicenter, Phase III Study of Trastuzumab Deruxtecan (T-DXd) Plus Rilvegostomig or Pembrolizumab vs Chemotherapy Plus Pembrolizumab as First-Line Therapy of HER2-Expressing (IHC 3+/2+), Mismatch Repair Proficient (pMMR), Primary Advanced or Recurrent Endometrial Cancer

Key Inclusion Criteria: * ≥ 18 years of age at the time of screening. Other age restrictions may apply as per local regulations. * Histologically confirmed diagnosis of epithelial endometrial carcinoma. All histologies are allowed except for sarcomas (carcinosarcomas are allowed). * Participant must have primary advanced disease (Stage III/IV) or recurrent endometrial cancer and meet at least one of the following criteria: 1. Primary Stage III (per FIGO 2023) disease with measurable disease at baseline per RECIST 1.1 based on the investigator's assessment. 2. Primary Stage IV (per FIGO 2…