Effects of ursodeoxycholic acid (UDCA) on the mRNA (A) and protein (B) expression of Fas and FasL in human oral squamous carcinoma HSC-3 cells. Fold-ratio: gene expression/GAPDH (β-actin) × control numerical value (control fold ratio: 1); (C), Fas mRNA expression folds of control; (D), FasL mRNA expression folds of control; (E), Fas/FasL mRNA expression proportion; (F), Fas protein expression folds of control; (G), FasL protein expression folds of control; and (H), Fas/FasL protein expression proportion. * Mean values are significantly different from control (p < 0.05) and ** mean values are significantly different from control (p < 0.01).