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 PF-07220060, Letrozole, or Fulvestrant. The registry lists allocation as randomized. This is a Phase 1/2A, open label, multicenter, nonrandomized, multiple dose, safety, tolerability, pharmacokinetic and pharmacodynamic study of PF-07220060 administered as a single agent and in combination with endocrine therapy.
They plan to enroll about 430 people at 39 sites. Taking part typically means taking a study drug (or dummy pill) plus check-ins.
Official title (unrewritten)
A PHASE 1/2A STUDY EVALUATING THE SAFETY, TOLERABILITY, PHARMACOKINETICS, PHARMACODYNAMICS, AND ANTI-TUMOR ACTIVITY OF PF-07220060 AS A SINGLE AGENT AND AS PART OF COMBINATION THERAPY IN PARTICIPANTS WITH ADVANCED SOLID TUMORS
Interventions: PF-07220060, Letrozole, Fulvestrant, Midazolam, Enzalutamide, Giredestrant, Tamoxifen
Primary outcome (registry wording): Number of participants with dose limiting toxicities in the Dose Escalation or De-escalation Portion