RAD18 and hepatocellular carcinoma: In addition, luciferase reporter assay showed that linc-ROR acts as a molecular sponge of miR-145 in HCC cells, and overexpression of linc-ROR can inhibit miR-145 expression and reduce translational inhibition of downstream miR-145 target RAD18, which is an important DNA repair factor, and radioresistance mediator 95.