What this phase means
Phase 3: this treatment already looked useful in smaller studies. Now it is tested in a large group, often against standard care or a dummy treatment, to see if it should be approved.
Phase labels are FDA/ICH categories applied to the registry Phase field. They are not a finding that this study succeeded.
What the registry says happens
If you join, the listed intervention(s) are Trastuzumab deruxtecan, Rilvegostomig, or Pembrolizumab. The registry lists allocation as randomized. DESTINY-Endometrial01 will investigate the how well it works of first-line T-DXd + rilvegostomig (Arm A) and/or T-DXd+ pembrolizumab (Arm B) when compared to chemotherapy (carboplatin + paclitaxel) + pembrolizumab (Arm C), by assessment of progression free survival (PFS), as assessed by BICR, in participants with HER2-expressing (IHC 3+/2+), pMMR, primary advanced (Stage III/IV) or recurrent EC.
They plan to enroll about 600 people at 230 sites. Taking part typically means taking a study drug (or dummy pill) plus check-ins.
Official title (unrewritten)
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
Interventions: Trastuzumab deruxtecan, Rilvegostomig, Pembrolizumab, Carboplatin, Paclitaxel, Docetaxel
Primary outcome (registry wording): Progression-free survival (PFS), as assessed by BICR