Immune checkpoint inhibitors combined with chemotherapy/radiotherapy, for EGFR wild-type lung cancer: Efficacy in real-world study.

Abstract

e15117 Background: The role of immune checkpoint inhibitors (anti-PD-1 antibody, ICI) combined with chemotherapy/radiotherapy for EGFR wild-type lung cancer is controversial, especially in 2nd-line or later treatment. The purpose of this study was to investigate the possible beneficial factors for immunotherapy for EGFR wild-type lung cancer. Methods: A total of 279 patients with EGFR wild-type lung cancer who received ICI were retrospectively analyzed, including 138 adenocarcinoma, 76 squamous carcinoma and 31 SCLC patients. Beneficial factors were determined by multivariable Cox proportional hazards model for PFS. PFS and ORR were compared between different therapies. Results: The specific results are shown in table. In multivariable analysis, ICI combined radiotherapy (P = 0.018; HR, 0.152(95% CI: 0.032, 0.727)) was identified as an effective independent factor for EGFR wild-type lung adenocarcinoma. PFS in patients who received ICI combined radiotherapy was significantly longer than that in those who received ICI monotherapy ((p = 0.032; not reached vs. 9.6 m (95% CI: 5.627, 13.640))). Among lung adenocarcinoma patients who received ICI as 2nd-line treatment, patients treated by ICI combined chemotherapy showed more benefit than those treated by ICI monotherapy (P = 0.003; HR, 0.012(95% CI: 0.001, 0.213)).ICI combined chemotherapy can significantly prolong PFS compared with those treated by ICI monotherapy (p = 0.015; 14.3 m [95% CI: 8.711, 19.822] vs. 1.1 m (95% CI: 0.25, 1.883)) in the 2nd-line treatment. However, ORR showed no significant different between ICI monotherapy and ICI combined chemotherapy(P = 0.626). Conclusions: ICI combined with radiotherapy showed better result than those who didn’t receive radiotherapy for EGFR wild-type lung adenocarcinoma. The addition of chemotherapy to ICI for the 2nd-line treatment in EGFR wild-type lung adenocarcinoma patients seems get more clinical benefit than ICI monotherapy. [Table: see text]