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Baseline use of corticosteroids is associated with poor outcomes in patients with non–small-cell lung cancer (NSCLC) treated with programmed cell death-1 axis inhibition. To approach the question of causation versus correlation for this association, we examined outcomes in patients treated with immunotherapy depending on whether corticosteroids were administered for cancer-related palliative reasons or cancer-unrelated indications.

Clinical outcomes in patients with NSCLC treated with immunotherapy who received ≥ 10 mg prednisone were compared with outcomes in patients who received 0 to < 10 mg of prednisone.

Of 650 patients, the 93 patients (14.3%) who received ≥ 10 mg of prednisone at the time of immunotherapy initiation had shorter median progression-free survival (mPFS) and median overall survival (mOS) times than patients who received 0 to …