Our results revealed a significant negative correlation between RACGAP1 expression and NKT infiltration in BLCA, BRCA, CESC, COAD, HNSC, HNSC-HPV-, KIRC, KIRP, LUAD, MEOV, PRAD, SKCM, STAD, THYM, and UVM. Here, RACGAP1 is linked to bladder transitional cell carcinoma.