ELFN1 and cancer: ELFN1 was positively correlated with the expression of a series of MMR genes in cancers such as ACC, CESC, DLBC, ESCA, GBM, HNSC-HPV-, KICH, KIRP, LGG, MESO, and OV, while it was negatively correlated in BRCA, LIHC, and SKCM (Figure 5A).