Our bioinformatic analyses of the TCGA using TIMER revealed that the differential expression of DPP4 is significant in 19 distinct types of cancer, including BRCA, CHOL, HNSC-HPV, KICH, LUSC, THCA (P-value < 0.001), COAD, ESCA, KIRC, KIRP, LIHC, LUAD, READ, STAD (P-value < 0.01), CESC, GBM, PCPG, SKCM, and UCEC (P-value < 0.05) (Fig. 6A). Here, DPP4 is linked to cancer.