HOXD1 and neoplasm: To assess whether the HOXD1, HOXD3, and HOXD4 overexpression in tumor tissues was related to cancer progression, the result showed that HOXD1 was markedly associated with different pathological stages of cancers, including KICH, KIRC, LIHC, THCA (p < 0.05) (Figure 2A).