2.3.3. Stratification by *KI67*

*KI67* characterizes the proliferation activity of tumor cells [29]. *KI67* expression was separated into two groups (low vs. high expression) by median mRNA (≤33.10 vs. >33.10). In the high *KI67* expression group, low *CXCL9* (RR = 4.54; *p* < 0.001) mRNA and low *PD-L1* (RR = 7.49; *p* = 0.001; Table 5) mRNA were associated with a higher risk of shorter RFS, but these associations were not observed in the low *KI67* group.
