A Multicenter, Open-label, Phase 1a/b Study of HC-7366 in Subjects With Advanced Solid Tumors

This is a first in human, multicenter, open label, Phase 1a/b dose escalation and dose expansion study to establish the maximum tolerated dose (MTD), recommended Phase 2 dose (RP2D), and evaluate the safety and tolerability of QD oral dosing of HC 7366 in a dose escalating fashion in subjects with advanced solid tumors. Up to 36 subjects will be enrolled into the Phase 1a dose escalation part of the study. Every effort will be made to ensure approximately 50% of all subjects enrolled in this study will be subjects with the tumors of special interest such as squamous cell carcinoma of the head and neck (SCCHN), colorectal cancer (CRC), non-small cell lung cancer (NSCLC), and transitional cell carcinoma of the bladder (TCC). Subjects with other solid tumor types are also eligible provided study selection criteria are met and they do not exceed 50% of all enrolled subjects. The study will be conducted in the United States at approximately 3 to 5 sites. This Phase 1a/b study will follow a traditional 3+3 design. The starting dose level will be 10 mg QD, escalating to 20, 40, 75, 125, and 150 mg QD as safety allows. All doses are to be administered in the fasting state with water at least 1 hour before food or at least 2 hours after food. The Phase 1b dose expansion part will involve cohort expansion at up to 2 dose levels selected from the dose escalation data by the safety monitoring committee (SMC), to obtain additional safety and preliminary efficacy information. Each cohort in Phase 1b will enroll 15 subjects. The study will be expanded into a Phase 2 study via protocol amendment which will then assess the dose and tumor type(s) selected in Phase 1a/b as the most appropriate for further clinical development. Subjects will be dosed until unacceptable toxicity, disease progression per immune-related Response Evaluation Criteria in Solid Tumors (iRECIST), discontinuation of treatment for other protocol allowed reason (eg, subject refusal), any other administrative reasons, or after 2 years of treatment, whichever occurs first. For scheduling purposes, dosing will occur in 3 week cycles and computed tomography (CT) scans will be conducted once every 6 weeks with the first postbaseline scan after 6 weeks of dosing (precycle 3).

HC-7366