GATA4 promotes cell proliferation in NPC cells. (A) Colony formation and (B) Cell counting kit-8 assays quantified cell proliferation of 5-8F cells transfected with an empty vector, a vector overexpressing GATA4, SCR or an siRNA against GATA4 (magnification, ×20). *P<0.05. #P<0.05 vs. the vector group. &P<0.05 vs. the SCR group. si, small interfering RNA; SCR, scramble siRNA; OD, optical density.