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 Arm A: Gedatolisib + Palbociclib + Fulvestrant, Arm B: Ribociclib + Fulvestrant, or Arm C: Gedatolisib + Palbociclib + Letrozole. The registry lists allocation as randomized. This is a Phase 3, open-label, randomly assigned, clinical trial evaluating the how well it works and safety of gedatolisib and palbociclib plus endocrine therapy for the treatment of patients with locally advanced or metastatic HR+/HER2- advanced breast cancer.
They plan to enroll about 1,180 people at 239 sites. Taking part typically means taking a study drug (or dummy pill) plus check-ins.
Official title (unrewritten)
VIKTORIA-2: A Randomized, Open-Label, Phase 3 Study Evaluating Efficacy and Safety of Gedatolisib With Endocrine Therapy and Palbociclib vs Endocrine Therapy and Ribociclib as First-Line Treatment in Patients With HR-Positive and HER2-Negative Advanced Breast Cancer
Interventions: Arm A: Gedatolisib + Palbociclib + Fulvestrant, Arm B: Ribociclib + Fulvestrant, Arm C: Gedatolisib + Palbociclib + Letrozole, Arm D: Ribociclib + Letrozole
Primary outcome (registry wording): Progression Free Survival (PFS)