Perioperative Immunonutrition Under Enhanced Recovery After Surgery

The goal of this clinical trial is to compare the effect of perioperative immunonutrition supplement in gynecologic cancer patients. The main questions it aims to answer are: * is there any difference in the nutritional outcomes and functional outcomes between intervention and conventional groups? * is there any difference in the post-surgical outcomes between intervention and conventional groups? Participants (intervention) will be provided the immunonutrition supplement before and after operation. Researchers will compare intervention group with conventional group to see if there is any difference in postoperative outcomes.