The resulting protein expression levels of EGFR and SQSTM1 in tumor tissue of all OSCC patients including buccal mucosa squamous cell carcinoma (BMSCC) and tongue squamous cell carcinoma (TSCC) patients were significantly higher than those in the CTAN tissues (all p < 0.001, Table 1). The gene discussed is EGFR; the disease is squamous cell carcinoma of buccal mucosa.