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. The gene discussed is CCL4; the disease is urinary bladder carcinoma.