A Phase 1/1b 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 (WIRB)

This is a Phase 1, open label, multicenter, nonrandomized, multiple dose, safety, tolerability, pharmacokinetic and pharmacodynamic study of PF-07220060 administered as a single agent and then in combination with endocrine therapy.

In Part 1A, single escalating doses of PF-07220060 alone will be administered to determine the maximum tolerated dose (MTD) and select the recommended phase 2 dose (RP2D). In Part 1B and Part 1C, PF-07220060 will be administered in combination with 1 of 2 endocrine therapies (letrozole and fulvestrant, respectively).

Part 1B and Part 1C may be enrolled and conducted in parallel at the completion of Part 1A.