In the past few years, some observational studies with small sample size found metformin and celebrex (selective cyclic oxidase-2 inhibitors) may reduce the rate of HCC after surgery. However, no prospective study compare their efficacy in preventing HCC recurrence. This trial aims to compare the role of celebrex alone, metformin alone, and celebrex plus metformin in preventing HCC recurrence after hepatic resection.