The mRNA expression levels of the 5 target radioresistance-related genes in Hep-2 and RR-Hep-2 cells. (A) RT-PCR analysis of the TOPO2A, PLXDC2, ETNK2, GFI1 and IL12B genes in Hep-2 and RR-Hep-2 cells. (B) The mRNA levels of TOPO2A, PLXDC2, ETNK2, GFI1, and IL12B were measured by quantitative real-time PCR.