The heatmap visually showed that ARL4C expression had a positive association with infiltration of B cells, macrophages, myeloid dendritic cells, neutrophils, CD4+ T cells, CD8+ T cells, and other immune cells, suggesting that ARL4C may be involved in the infiltration of these immune cell types in the KIRC tumor microenvironment. This evidence concerns the gene CD4 and neoplasm.