To clarify the HOXC9 expression, we then used GEPIA database (http://gepia.cancer-pku.cn/), which is based on (The Cancer Genome Atlas) TCGA database, to obtain and analyze the relative HOXC9 expression data between head and neck squamous cell carcinoma (HNSCC) tissues and adjacent normal tissues, The results showed that HOXC9 was more highly expressed in HNSCC tissues (Figure 1D). Here, HOXC9 is linked to head and neck squamous cell carcinoma.