This is a multicenter, open-label phase 1/2 study in participants with advanced solid tumors, including RET fusion-positive non-small cell lung cancer and other tumors with RET activation. The trial will be conducted in 2 parts: Phase 1 and phase 2. Participants with advanced cancer are eligible if they have progressed on or intolerant to available standard therapies, or no standard or available curative therapy exists. The phase 1 study is a dose-escalation study, which is designed to evaluate the safety, tolerability, pharmacokinetics and preliminary anti-tumor activity of single dose and multiple doses of HS-10365 given once every day (QD) or twice every day (BID). A dose of 160 milligrams (mg) twice a day (BID) has been selected as the recommended phase 2 dose (RP2D). Approximately 273 participants with advanced solid tumors harboring a RET gene alteration will be enrolled to one of nine phase 2 cohorts:~Cohort 1: RET fusion non-small cell lung cancer (NSCLC) that has progressed after at least first-line therapy Cohort 2: RET fusion NSCLC not previously treated for metastatic disease Cohort 3: Medullary thyroid carcinoma that has progressed after at least first-line therapy Cohort 4: RET mutation-positive MTC not previously treated for metastatic disease Cohort 5: RET fusion Radioiodine-refractory thyroid cancer Cohort 6: Advanced solid tumors with RET gene fusion except for cohort 1 to 5 Cohort 7: Advanced solid tumors with RET gene abnormalities and drug resistance or intolerance previously treated with RET inhibitors except for cohort 1 to 6 Cohort 8: Advanced solid tumors with RET gene abnormality except for cohort 1 to 7 Cohort 9: NSCLC with RET gene abnormality except for cohort 1 to 2
HS-10365 is a small molecular, oral potent, selective RET inhibitor. The purpose of this study is to investigate the safety/tolerability、the pharmacokinetic profile and efficacy of HS-10365 in Chinese advanced solid tumor patients.