Abstract
Abstract
Purpose
Growing numbers of clinical trials test the efficacy of radiotherapy (RT) plus immune checkpoint inhibitors (ICIs), but the number of irradiated sites is not uniform. We aimed to evaluate the efficacy of single-site RT plus immunotherapy in oligometastatic non-small cell lung cancer (NSCLC) with smaller disease burdens and low tumor heterogeneity.
Methods
We retrospectively identified oligometastatic NSCLC (< 4 metastatic sites) patients treated with PD-1 pathway inhibitors with or without RT to a single lesion in our institution between 2018 and 2020. The primary endpoints were the best objective response rate (ORR) and progression-free survival (PFS).
Results
Of the 152 patients enrolled, 93 and 59 were identified as the ICI alone group and the ICI plus RT group, respectively. The addition of RT to ICI therapy significantly increased the best ORR from 31.2% to 50.8% (p = 0.015). The out-of-field (abscopal effect) response rate could reach 41.3% (95%CI 26.5%–56.1%) in the ICI plus RT group. Median PFS was 8.9 months (95%CI 4.7–13.1 months) with ICI alone versus 13.8 months (95%CI 9.5–18.1 months) with ICI plus radiotherapy (hazard ratio [HR] 0.556; p = 0.035). In an exploratory subgroup analysis of PFS, the addition of RT brought greater benefits in patients aged < 65 years (p = 0.016), patients with ECOG PS = 0 (p = 0.048), and patients with 1–2 metastatic sites (p = 0.024). No unexpected adverse events or significantly increased toxicities were observed in the experimental arm.
Conclusion
Single-site RT plus anti-PD-1 inhibitors significantly increased systemic responses and improved survival outcomes in oligometastatic NSCLC patients.
Funder
The National Key Research and Development Projects of China
Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences and Peking Union Medical College
the Academic Promotion Program of Shandong First Medical University
the foundation of National Natural Science Foundation of China
Publisher
Springer Science and Business Media LLC
Subject
Cancer Research,Oncology,General Medicine
Cited by
13 articles.
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