Background: Until 2004, we treated peritoneal carcinomatosis with cytoreductive surgery accompanied by perioperative systemic chemotherapy. From October 2004, we decided to initiate a hyperthermic intraperitoneal chemotherapy (HIPEC) program for this condition. Objective: To determine the effect of HIPEC on postoperative outcomes at a single institution performing a high volume of cancer operations. Method: Sixty consecutive patients underwent cytoreductive surgery plus HIPEC (oxaliplatin; 460 mg/m 2 in 2 L/m 2) from October 1, 2004, through December 31, 2010. Usual perioperative factors were studied for 3 groups of patients who underwent HIPEC: 0 to 20 HIPEC procedures (period 1), 21 to 40 HIPEC procedures (period 2), and 41 to 60 HIPEC procedures (period 3). Results: The mean peritoneal carcinomatosis index was 9.6, the mean duration of surgery was 410.7 minutes, and the mean blood loss was 450.2 mL/L. Mortality and mor