We also used TIDE database to evaluate the relationship between ELFN1 promoter methylation and cytotoxic T lymphocyte (CTL) levels in cancers such as BLCA, BRCA, BRCA-Luminal A, BRCA-Basal, TNBC, COADREAD, ESCA, GBMLGG, HNSC-HPV+, LUAD, LUSC, PAAD, SARC, STAD, UCEC, and UVM. Here, ELFN1 is linked to cancer.