Clinical trials

This is a Phase I（Ib）, open-label, single-arm clinical study designed to evaluate the safety, tolerability, pharmacokinetics (PK), and preliminary efficacy of R01 administered orally as monotherapy twice daily (BID) in patients with advanced solid tumors, including squamous cell lung cancer, gastric cancer , and esophageal cancer. Patients with advanced squamous cell lung cancer, gastric cancer , and esophageal cancer will be enrolled. All subjects will receive oral R01 monotherapy and will undergo physical examinations, laboratory tests, radiographic tumor response assessments, biological sample collection, and safety follow-ups as specified in the protocol. The study comprises two consecutive sub-stages: a dose-bridging escalation stage (i.e., a dose escalation stage designed to bridge from the highest dose evaluated in Phase Ia) and a dose expansion stage. The dose escalation follows a classic '3+3' design at three dose levels (240, 320, and 400 mg BID). The 400 mg dose may be initiated after the Safety Review Committee (SRC) review based on safety and PK data. The primary objectives of this stage are to characterize dose-limiting toxicities (DLTs), determine the maximum tolerated dose (MTD), and establish the recommended Phase II dose (RP2D). The dose expansion stage will be conducted at the RP2D in selected indication cohorts, with a planned enrollment of at least 6 subjects per cohort (including subjects with the corresponding indications enrolled at the same dose level during the dose escalation stage), to further evaluate the safety, tolerability, PK characteristics, and preliminary antitumor efficacy at this dose level. With respect to study endpoints: during the dose escalation stage, the primary endpoints are the incidence of DLTs, the MTD, and/or the determination of the expansion dose (RP2D); secondary endpoints include PK parameters of R01 and its metabolites, objective response rate (ORR), disease control rate (DCR), progression-free survival (PFS), and overall survival (OS). During the dose expansion stage, the primary endpoints are ORR and the incidence and severity of treatment-related adverse events (TRAEs); secondary endpoints include duration of response (DOR), time to response (TTR), DCR, PFS, OS, and steady-state PK parameters.