Effectiveness and safety of combination immunotherapy with or without ipilimumab according to PD-L1 expression in patients with non-small cell lung cancer: a multi-center retrospective cohort study.

However, although the difference was not statistically significant, the Kaplan-Meier curves for OS showed a trend toward more prolonged survival in the C + NI group, suggesting that a subset of patients may benefit from the addition of ipilimumab ( Figure S3 ).

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