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Kaplan–Meier analysis of PFS. (A) PFS rate for LIPI; (B) PFS rate for mLIPI; and (C) PFS rate for EPSILoN. PFS, progression‐free survival; LIPI, lung immune prognostic index; mLIPI, modified lung immune predictive index; EPSILoN, Eastern Cooperative Oncology Group performance status, smoking, liver metastases, lactate dehydrogenase, neutrophil‐to‐lymphocyte ratio
