TK1 expression in tumor and normal tissues of 20 cancer types in the TCGA cohort was analyzed; TK1 was upregulated in 70% of tumors, including BLCA, UCEC, HNSC, PRAD, KIRP, COAD, LUSC, KIRC, LIHC, BRCA, THCA, LUAD, CHOL, ESCA, and STAD (Figure 9B). The gene discussed is TK1; the disease is cancer.