Figure 1. Effect of morphine on HCC cell proliferation, invasion and migration. The HCC cell lines QGY-7703 and SMMC-7721 were treated with morphine (0, 0.01,10, or 1000 μm/L) for 72 h. (A, B) Cell proliferation was assessed by MTT assay. (C, D) Migration of cells was assessed in a transwell assay. (E, F) Invasion by cells was assessed in a transwell assay. *P < 0.05, **P < 0.01.