Oral Immunonutrition With Synbiotics, Omega 3 and Vitamin D in Patients Undergoing Duodenopancreatectomy for Tumoral Lesion.

To the best knowledge of the Investigators, a comprehensive multimodal approach to reduce postoperative morbidity in duodenopancreatectomies has not yet been evaluated. In the study, the Investigators combine the main nutritional interventions currently available and already having an individual scientific basis, sequentially and simultaneously, for a potential synergistic effect. In cases of duodenopancreatectomy for tumoral lesion, a group of patients taking only conventional immunonutrition regimen (CIR), for 7 preoperative days, will be compared with a second group where immunonutrition will be maximised by the addition of omega 3 for 1 week prior to the administration of CIR, synbiotics for 14 days pre- and post-operatively, and preoperative vitamin D supplementation for 6 days, in terms of postoperative overall morbidity.