Single-arm phase II study of consolidation serplulimab following hypofractionated radiotherapy with concurrent chemotherapy for patients with limited stage small-cell lung cancer: ASTRUM-LC01 study protocol.

Abstract

With the inspiring results of the PACIFIC trial in non-small-cell lung cancer (NSCLC), and the CAPIAN and IMpower133 trials in extensive-stage small-cell lung cancer (SCLC), immunotherapy has increasingly gained attention. Serplulimab, a PD-1 inhibitor, showed great antitumour activity in the ASTRUM-005 trial and has been recommended as first-line therapy in extensive-stage SCLC. Whether serplulimab following hypofractionation radiotherapy and chemotherapy could bring better outcomes in limited-stage SCLC remains to be answered. We designed a prospective multicentre single-arm phase II clinical trial to evaluate both the efficacy and safety of chemoradiotherapy and consolidation by serplulimab in limited-stage SCLC. Eligible patients will receive standard chemotherapy for four cycles and concurrent thoracic radiotherapy with a total dose of 45 Gy in 3 weeks and a 3 Gy dose per fraction. Prophylactic cranial irradiation is recommended for responding patients. Serplulimab will be delivered afterwards every 3 weeks for up to 1 year. Based on sample size estimation, 55 patients will be enrolled in total. Ethics approval was obtained from the Independent Ethics Committee of National Cancer Centre/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College (22/236-3438). NCT05443646.