HOXD9 and malignant colon neoplasm: The box diagram showed that HOXD9 expression was low in colon cancer with no significant difference; HOXD9 was significantly lowly expressed in BRCA, UCEC, PRAD, KIRC, KIRP, and other tumors, while in CHOL, ESCA, HNSC, LUSC, and STAD tumors, HOXD9 was significantly highly expressed and showed tissue specificity (Fig. 13a).