A Study of Hetrombopag Combined With rhTPO in the Treatment of Cancer Therapy-induced Thrombocytopenia (CTIT) in Solid Tumor Patients.

Objective To evaluate the efficacy and safety of hetrombopag plus rhTPO versus hetrombopag monotherapy for CTIT in solid-tumor patients. Participants 204 histologically- or cytologically-confirmed solid-tumor patients with ≥grade 3 thrombocytopenia following anti-cancer treatment. Design Open-label, multicenter, randomized controlled phase II study. Patients are randomized 1:1 into two arms: Experimental arm (N=102): rhTPO 15,000 IU/day subcutaneously + hetrombopag 7.5 mg/day orally, both starting on Day 1 for up to 14 days. Control arm (N=102): Hetrombopag 7.5 mg/day orally starting on Day 1 for up to 14 days. Stopping \& Rescue Rules Stop study drug if PLT ≥100×10⁹/L or rises ≥50×10⁹/L from baseline. If PLT ≤10×10⁹/L or \<20×10⁹/L with bleeding risk, give rescue therapy (platelet transfusion or investigator-chosen alternative). Primary Endpoint Proportion of patients achieving PLT ≥100×10⁹/L or an increase ≥50×10⁹/L from baseline within 14 days of treatment.