Among these checkpoint genes, the expression of CNN1 correlated positively with immune checkpoint genes in GBM, OV, LUAD, LUSC, PRAD, BLCA, KIRP, LIHC, BRCA, COAD, SKCM, KIRC, THCA, HNSC, LAML, READ, LGG, KICH, ACC, PCPG, and UVM. Here, CNN1 is linked to glioblastoma.