The results showed that in bladder cancer, FLT3LG not only exhibited significant positive correlations with immune checkpoints (CTLA416, IDO117), cytokines and chemokines (TNFSF13B, TNFRSF14, CXCR3, CCL4) but also exhibited the closest association with genes related to HLA18. Here, CCL4 is linked to urinary bladder cancer.