RecruitingPhase 2Drug trialPhase II Study of Ivonescimab and Cadonilimab in Combination with Chemotherapy in Patients with ES-SCLCThis is a phase II study. All patients are treatment naive extensive stage small cell lung cancer(ES-SCLC), Eastern Cooperative Oncology Group (ECOG) performance status 0-1. The purpose of this study is to evaluate the efficacy and safety of Ivonescimab and Cadonilimab in combination with chemotherapy in patients with ES-SCLC.