Figure 1.

(a) Expression level of RASSF1A in NPC cell lines, normal nasopharyngeal epithelial and primary tumor biopsies by RT-PCR, T, primary nasopharyngeal tumor tissues; N, normal nasopharyngeal epithelial; M; marker I. GAPDH was amplified as an internal control. (b) Summary of overall expression of RASSF1A in 38 primary NPC tumors and 14 normal nasopharyngeal epithelial biopsies. RASSF1A expression was significantly down-regulated in NPC primary tumors compared with normal nasopharyngeal epithelial (p < 0.01, Mann-Whitney's U test).