We found that IL4I1 was highly expressed in 25 types of tumors, namely ACC, bladder urothelial carcinoma, BRCA, CESC, cholangiocarcinoma, COAD, ESCA, GBM, HNSC, KIRC, KIRP, LAML, LGG, LIHC, LUAD, LUSC, OV, PAAD, PRAD, READ, SKCM, STAD, THCA, UCEC, and UCS. Here, IL4I1 is linked to glioblastoma.