A sample size of 30 patients, 15 in each arm was required todetect a true difference of tumor tissue cisplatin concentration of20 mg/g between the study and control groups (60 mg/g vs 40 mg/g)with power of 90% and type I error of 0.05. The standard deviation(SD) was estimated at 15 mg/g based on literature data 20% ofcases were anticipated to not tolerate high-IAP during HIPEC,therefore the final sample size was decided at 38 cases with 19patients per treatment arm.