Aim: To explore the role of microRNA(miR)-509-3p in proliferation and invasion of liver carcinoma cells.Methods: A total of 60 cases of liver carcinoma tissue and 60 cases of paracancerous tissue were selected,and the miR-509-3p expression was detected by real-time PCR. Hep G2 cells were cultured and transfected with miR-509-3p mimic,miR-509-3p inhibitor or XIAP siRNA,and cells without any treatment were the control group. The cell proliferation activity was detected by CCK-8,and cell invasion was detected ...