EGFR and salivary gland adenoid cystic carcinoma: Furthermore, in a human salivary gland adenoid cystic carcinoma cell line SACC-38, EGCG (in concentrations of 5, 10, 20, 40, and 80 μM for 48 h) significantly decreased EGFR protein levels and inhibited EGFR phosphorylation [172].