• Mari Tone, Takehiro Izumo, Nobuyasu Awano, Naoyuki Kuse, Minoru Inomata, Tatsunori Jo, Hanako Yoshimura, Jonsu Minami, Kohei Takada, Shingo Miyamoto, and Hideo Kunitoh.
• Department of Respiratory Medicine, Japanese Red Cross Medical Center, Tokyo, Japan.
• Thorac Cancer. 2019 Oct 1; 10 (10): 2006-2012.

BackgroundThe treatment efficacy of immune checkpoint inhibitor (ICI) and clinical outcomes in patients with non-small cell lung cancer (NSCLC) who develop severe grade checkpoint inhibitor pneumonitis (CIP) are unclear. Here, we report on the treatment efficacy of ICI and prognosis in NSCLC patients with severe grade CIP.MethodsIn this retrospective cohort study, CIP severity, CIP-related mortality, and ICI efficacy in 71 patients with advanced NSCLC treated with ICIs were evaluated. Data was obtained from the patients' medical charts.ResultsAll grade and severe grade CIP were observed in 22 and 11 patients, respectively. The CIP-related mortality rate was 22.7% (N = 5). An Eastern Cooperative Oncology Group (ECOG) Performance Status (PS) score of ≥2 and pre-existing interstitial lung disease (ILD) were significantly associated with the development of severe grade CIP (P = 0.001 and P = 0.035, respectively). The median progression-free survival (PFS) and overall survival (OS) were significantly shorter in patients with severe grade CIP than in those without severe grade CIP (PFS 1.0 month, 95% confidence interval [CI] 0.5-2.0 vs. 3.5 months, 95% CI 2.0-5.0 months, P = 0.003; OS 3.0 months, 95% CI 0.5-13 vs. 12.7 months, 95% CI 8.0-21.0 months, P = 0.011).ConclusionCIP is a serious complication with a poor prognosis associated with high mortality. The efficacy of ICI is significantly worse in patients with severe grade CIP than in those without severe grade CIP. Whether ICIs should be administered to patients with CIP risk factors, such as an ECOG PS score of ≥2 or pre-existing ILD, should be carefully assessed.© 2019 The Authors. Thoracic Cancer published by China Lung Oncology Group and John Wiley & Sons Australia, Ltd.

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