What this phase means
Phase 2: researchers already know a roughly safe dose (from phase 1). This stage asks whether the treatment actually helps the condition, and watches side effects more closely.
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 Sonesitatug Vedotin, Rilvegostomig, or Trastuzumab Deruxtecan (T-DXd). The registry lists allocation as randomized. GEMINI-PeriOp GC study will assess the safety, tolerability, pharmacokinetics (PK) and preliminary anti-tumor activity of novel agents or novel combinations as perioperative treatment in participants with locally advanced resectable gastric, gastroesophageal junction (GEJ), or esophageal adenocarcinoma who have not received previous treatment for the disease.
They plan to enroll about 100 people at 59 sites. Taking part typically means taking a study drug (or dummy pill) plus check-ins.
Official title (unrewritten)
A Master Protocol of an Open-Label, Multi-Drug, Multi-Center, Phase II Platform Study to Evaluate the Safety, Tolerability, Pharmacokinetics, and Preliminary Anti-tumor Activity of Novel Agents or Combinations as Perioperative Treatment in Participants With Locally Advanced Resectable Gastroesophageal Adenocarcinoma (GEMINI-PeriOp GC)
Interventions: Sonesitatug Vedotin, Rilvegostomig, Trastuzumab Deruxtecan (T-DXd), Capecitabine, 5-Fluorouracil (5-FU), FLOT Chemotherapy, Calcium folinate
Primary outcome (registry wording): Number of participants with adverse events (AEs) and serious adverse events (SAEs)