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 and 1b dose-escalation and dose-expansion study to establish the maximum tolerated dose, recommended Phase 2 dose, 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 40 subjects will be enrolled into the Phase 1a dose-escalation part of the study. The study will be conducted in the United States at approximately 7 to 10 sites. Every effort will be made to ensure approximately 50% of all subjects enrolled into Phase 1a of this study are subjects with the tumors of special interest including squamous cell carcinoma of the head and neck, colorectal cancer, non-small cell lung cancer, and transitional cell carcinoma of the bladder. 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. All subjects in Phase 1b will enroll with clear cell renal cell carcinoma. The Phase 1a 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 will be at a single dose level of 75 mg based on the safety, tolerability, PK/PD results from Phase 1a to obtain additional safety and preliminary efficacy information. At the discretion of the safety monitoring committee and sponsor, the cohort may be expanded to enroll additional patients and/ or 1-2 additional cohorts will be opened. Up to 30 subjects may be enrolled in the Phase 1b portion of the study at the 75 mg dose. Replacement patients will be enrolled if necessary. Subjects will be dosed until unacceptable toxicity, disease progression per immune-related Response Evaluation Criteria in Solid Tumors, 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 in Phase 1a and 1b will occur in 3 week cycles and computed tomography scans will be conducted once every 6 weeks from Cycle 1/Day 1, with the first postbaseline scan after 6 weeks of dosing (precycle 3) until confirmed disease progression, death, start of new anticancer therapy, withdrawal of consent, or end of study, whichever occurs first.

HC-7366