Summary
This is an open-label, dose-escalation and dose-expansion study to determine the safety,
tolerability, PK, pharmacodynamics, and preliminary efficacy of INCB123667 when
administered as monotherapy at the RDE(s) in participants with selected advanced or
metastatic solid tumors. Part 1A (dose escalation) will determine the recommended dose of
INCB123667 for expansion (RDE) and the maximum tolerated dose (MTD). Part 1B (cohort dose
expansion phase) will further explore antitumor activity of INCB123667 as a monotherapy
in 6 tumor-specific cohorts at the RDE(s) defined in Part 1A.