Head and neck squamous cell carcinoma(HNSCC) is the fourth common malignancy in Taiwan. It accounts for 5.8% of all cancers and causes 2,463 deaths per year. Aberrant glycosylation is the hallmark of most human cancers, including HNSCC, and affects many cellular properties. This study is aimed at exploring the role of mucin glycosylating enzymes in HNSCC.