Kaplan‐Meier curves according to the lung immune prognostic index (LIPI) in ED‐SCLC patients. (a) The median progression‐free survival (PFS) of the LIPI 0 group and LIPI 1 group was significantly longer than that of the LIPI 2 group (6.6 months vs. 4.0 months, P = 0.006 and 5.5 months vs. 4.0 months, P = 0.015, respectively) ( ) LIPI 0 group, ( ) LIPI 1 group, ( ) LIPI 2 group. The median PFS of the LIPI 0 group was not significantly different from that of the LIPI 1 group (P = 0.725). (b) The median overall survival (OS) of the LIPI 0 group was significantly longer than that of the LIPI 1 group and LIPI 2 group (17.1 months vs. 11.6 months, P = 0.009 and 17.1 months vs. 5.9 months, P < 0.001, respectively) ( ) LIPI 0 group, ( ) LIPI 1 group, ( ) LIPI 2 group. The median OS of the LIPI 1 group was significantly longer than that of the LIPI 2 group (P = 0.001).