cyto reduction and Hipec have definitely prolonged survival in select group of patients with disseminated disease. Though we do it with curative intent,it is palliative in majority.Unless the GB is involved ,it is not necessary to do cholecystectomy.I did not come across any article where cholecystectomy as a routine part of the procedure.However the above oncological procedures are relatively new and in course of time cholecystectomy may become a part of the procedure to prevent stone formation as the longivity of life further improves.Interesting question,never thought of it inspite of years of experience in doing cholecystectomy.