SQSTM1 and lip and oral cavity carcinoma: GSH was significantly reduced under 5-10 Gy X-ray irradiation in both oral cancer cells treated with shRNAs for p62/SQSTM1 (sh-p62(1) and sh-p62(2); red and brown columns), although it was maintained under 5-10 Gy X-ray irradiation in the control shRNA cells (sh-control; blue columns; one-way factorial ANOVA and multiple comparison tests accompanied by Scheffe's significance test, p<0.05; Figure 4A).