Notably, the results indicated that HNSC, KIRC, LGG, LIHC, PRAD, and THYM were six cancer types most strongly associated with KIF15 expression in immune cell infiltrating level, including B cells, CD8+ T cells, CD4+ T cells, macrophages, neutrophils, and dendritic cells (Supplementary Figure 5). Here, CD4 is linked to cancer.