EGCG inhibits the activity of MMP-9 by up-regulating the cell adhesion molecules E-cadherin and β-catenin and suppressing the extracellular signal-regulated kinase (ERK) phosphorylation, restrains the proliferation, invasion, and growth of tumor cells, and becomes a promising medicine for chemoprevention or adjuvant therapy of nasopharyngeal carcinoma [24]. Here, MMP9 is linked to neoplasm.