First- Line Treatment With Durvalumab Plus XELOX Chemotherapy in Advanced Gastrointestinal Neuroendocrine Carcinoma

"Combination therapy includes:~Durvalumab: intravenous infusion with a fixed dose of 1500 mg on day 1, repeated every 3 weeks ± 3 days; Chemotherapy: Oxaliplatin 130mg/m2 intravenous infusion on day 1, capecitabine 1000mg/m2, orally, twice a day, from day 1 to day 14; repeated every 3 weeks ± 3 days;~After 6 cycles of combination therapy, maintain with durvalumab 1500 mg every 4 weeks ± 3 days for 2 years. Terminate the trial if confirmed disease progression, initiation of other anti-tumor therapy, unacceptable toxicity, withdrawal of informed consent or other reasons considered by the investigators."