The results depicted that RAC1 expression was positively correlated with many immune checkpoints, such as PDCD1, LAG3, CTLA4, HAVCR2, and TIGIT, and immunosuppressive factors, such as CSF1R, IL10, TGFB1, TGFBR1, and VTCN1, in most cancer types, namely ACC, BLCA, BRCA, KICH, KIRC, KIRP, LGG, LIHC, PAAD, PCPG, PRAD, and UVM. Here, TGFBR1 is linked to cancer.