LAUSR

Background Gastroenteropancreatic neuroendocrine carcinoma (GEP-NEC) is a group of rare but highly aggressive malignancies. The standard chemotherapy regimens composed of etoposide and cisplatin/carboplatin (EP/EC) are of limited efficacy. This prospective, multicenter, phase II study is conducted to explore the effectiveness and safety of first-line anti-PD-1 antibody (camrelizumab) combined with chemotherapy in advanced GEP-NEC patients. Methods Patients with unresectable or metastatic GEP-NEC will receive camrelizumab combined with standard first-line chemotherapy every 3 weeks (camrelizumab 200 mg, administered intravenously on day 1; etoposide 100 mg/m2, administered intravenously on days 1–3; cisplatin 75 mg/m2, administered intravenously on day 1 or carboplatin area under the curve 5 mg/ml per min, administered intravenously on day 1). All patients were naïve to systemic therapy in the advanced setting. The primary endpoint is a 6-month progression-free survival (PFS) rate. The secondary endpoints are objective response rate, PFS, overall survival and adverse reactions. Discussion This is the first study to investigate the therapeutic potential of camrelizumab plus chemotherapy for advanced GEP-NEC. It is expected that this trial will propose a new and effective treatment strategy for GEP-NEC in the first-line setting. Clinical Trial Registration This trial is registered at the Chinese Clinical Trial Registry http://www.chictr.org.cn, identifier ChiCTR2100047314. Date of Registration June 12, 2021.