Specifically, XRCC1 expression showed significant correlations with T cell CD8+ infiltration in 15 types of cancer, T cell CD4+ infiltration in 14 types of cancer, neutrophil infiltration in 14 types of cancer, myeloid dendritic cell infiltration in 11 types of cancer, and B cell infiltration in 9 types of cancer. This evidence concerns the gene CD4 and cancer.