However, the HOXD1 expression was decreased in BRCA (Breast invasive carcinoma), COAD (colon adenocarcinoma), KICH (Kidney chromophobe), KIRC, KIRP (Kidney renal papillary cell carcinoma), READ (Rectum adenocarcinoma), and TGCT (Testicular germ cell tumors) (p < 0.01) (Figure 1A). This evidence concerns the gene HOXD1 and testicular germ cell tumor.