BackgroundInterstitial lung abnormalities (ILAs) are known to be a risk of drug-induced pneumonitis. However, there are few reports on the relationship between ILAs and immune checkpoint inhibitor-related interstitial lung disease (ICI-ILD). We retrospectively investigated the clinical signi cance of ILAs in patients with nonsmall cell lung cancer (NSCLC) receiving ICI.
MethodsWe de ned ILAs as nondependent abnormalities affecting more than 5% of any lung zone, including ground-glass or diffuse centrilobular nodularities, traction bronchiectasis, honeycombing, and nonemphysematous cysts. Early-onset ICI-ILD was de ned as developing within 3 months after the initiation of ICI administration.
ResultsOf 264 patients with advanced NSCLC, 57 patients (21.6%) had ILAs (43 brotic and 14 non brotic ILAs).The difference between the incidence of ICI-ILD in patients with or without ILAs was not signi cant. Of 193 patients treated by ICI monotherapy, 18 (9.3%) developed early-onset ICI-ILD. Among patients receiving ICI monotherapy, the incidence of early-onset ICI-ILD was signi cantly higher in patients with than in patients without non brotic ILAs.
ConclusionThe presence of non brotic ILAs is a signi cant risk for early-onset ICI-ILD in patients with NSCLC undergoing ICI monotherapy. Clinicians should be aware of ILAs, especially non brotic ILAs, before administering ICIs to lung cancer patients.warranted to validate the present ndings. In conclusion, the presence of non brotic ILAs was a signi cant risk factor for early-onset ICI-ILD in patients about to undergo ICI monotherapy. The presence of ILAs is more likely to be associated with lung cancer then the absence of ILAs, and early-onset ICI-ILD can interfere with the treatment of lung cancer and can be life-threatening. Clinicians should bear in mind the possible presence of ILAs, especially non brotic ILAs, in patients with lung cancer, before they decide to administer ICIs.