Evaluating the effect of immune checkpoint inhibitor treatment on chronic obstructive pulmonary disease in lung cancer patients.

Immune checkpoint inhibitors (ICIs) are first line treatment for advanced lung cancer. Tobacco use is a shared risk factor for lung cancer and chronic obstructive pulmonary disease (COPD). Although many patients with COPD and lung cancer receive ICIs, the impact of ICIs on COPD is unknown. Here, we evaluated whether ICI treatment was associated with increased COPD disease burden. We conducted a retrospective cohort study of lung cancer patients with and without preexisting COPD who received ICIs from 2011-2021 at The Ohio State University (OSU). For all patients, number of steroid courses and respiratory related hospitalizations were recorded. For those with COPD, COPD medications were collected at and after ICI initiation. Pulmonary function tests, COPD exacerbations, and COPD-related hospitalizations were compared before and after ICI treatment. Linear and generalized mixed models were used to account for potential confounders of worsening COPD. Among 1083 lung cancer patients who received ICIs, 585 (54.0%) had pre-ICI COPD. Patients with COPD were prescribed more COPD medications (3 [1, 4] vs 1 [0, 3], p < 0.001), had more COPD exacerbations (38.3% vs 25.8%, p < 0.001), and more COPD-related hospitalizations (27.9% vs 16.9%, p < 0.001) after ICI initiation compared to before. These findings persisted after multivariable analysis controlling for patients who received chemotherapy or chemoradiation within 12 months of ICI initiation, cancer type, age, BMI, sex, smoking status, type of ICI, and number of ICI doses (p < 0.001). This is a comprehensive study that describes lung cancer patients with COPD treated with ICIs have increased COPD disease burden after ICI initiation.