According to above basic findings, it is important to confirm those results in clinic. In this branch, the investigators will use patient control analgesic (PCA) device to investigate the consumption of morphine for patients undergoing hepatic surgery. Preoperative and postoperative (before and after surgery) blood will be sampling (15cc/time) and y liver tissue (10mm3) will be harvested to measure the expression of above molecules (TM, IL-20, HD). Pain questionnaire will also be applied to evaluate their pain control quality. Certainly, the morphine consumption and results from pain questionnaire will be correlated with the molecule amount to figure out possible relationship between morphine consumption and those molecules.