RecruitingDrug trialA Single-arm, Open-label, Clinical Trial of Surufatinib/Serplulimab/Platinum/Etoposide in Neuroendocrine Carcinoma.This study is a prospective open-label, single-arm, single-center clinical study. Patients with neuroendocrine carcinoma who had not previously received standard therapy were enrolled in this study once they have signed the informed consent form (ICF) and been identified as eligible in screening. This clinical trial evaluates the efficacy and safety of surufatinib and serplulimab combined with standard chemotherapy (Platinum/Etoposide) in neuroendocrine carcinoma.