Long-term survival after cytoreductive surgery and hyperthermic intraperitoneal chemotherapy compared with hepatic resection for metastatic colorectal cancer.

Abstract

630 Background: Surgical resection of peritoneal metastases (PM) from colorectal cancer has been reported to yield outcomes similar to liver resection for hepatic metastases (HM). However recent data suggests PM may have a worse prognosis than other metastatic sites. Methods: A review of metastatic colorectal cancer patients obtained from prospective databases (1992-2010) comparing liver resection for HM to cytoreductive surgery (CS) and hyperthermic intraperitoneal chemotherapy (HIPEC) for PM. Results: 181 patients underwent hepatic resection and 182 patients underwent CS/HIPEC with a median follow-up of 55 and 106 months respectively. A margin-negative resection was obtained in 168 (93%) hepatic resections, while 89 patients (49%) with PM had complete cytorection of all gross disease (R0/R1). A comparison of these two groups demonstrated significant differences in age, pre-operative chemotherapy and performance status. Disease-free median survival was 15.2 months after hepatic resection and 9.9 months after CS/ HIPEC (p=0.02). The 5-year overall survival (OS) for HM patients was 33% with a median OS of 45.0 months; while 5-year OS was 23% and median OS was 32.3 months for PM patients (p=0.02). In a proportional hazards regression model, performance status and pre-operative chemotherapy had no significant effect on survival, while increased age (p=0.02) and PM (p=0.03) were associated with decreased OS. Postoperative morbidity was 38% versus 51% (p=0.04) and mortality was 3.0% versus 2.3% (p=0.73) in the HM and PM groups, respectively. Conclusions: Disease-free survival and OS are worse for patients who received complete cytoreduction and CS/HIPEC for PM compared to margin-negative liver resection for HM suggesting a more aggressive tumor biology in PM.