Stage IV colorectal cancer: An NCDB analysis of the surgical treatment of peritoneal carcinomatosis versus liver metastases.

Abstract

e15067 Background: Traditionally, peritoneal carcinomatosis (PC) secondary to colorectal cancer (CRC) was perceived as a terminal disease, for which the only palliation was offered. With the emergence of new surgical approaches such as cytoreductive surgery (CRS) and hyperthermic intraperitoneal chemotherapy (HIPEC), surgical intervention in select patients with ‘curative’ intent was made possible. In this study, we compared the outcomes of the surgical intervention on stage IV CRC patients with isolated liver metastases (LM) to those with PC only. Methods: The National Cancer Database (NCDB) for CRC was analyzed excluding patients with PMP. Patients with isolated LM or with PC were identified, then divided into 2 treatment groups per the current treatment of each scenario: LM patients treated with surgery±chemotherapy (LM group), and PC patients treated with surgery+chemo±HIPEC (PC group). Results: 21,829 patients were identified; 18,932 fell in the LM group, and 2,897 in the PC group. Mean age in the LM and PC groups was 62.94±13.54 vs. 59.59±13.73. No significant difference was noted in the 30-day readmission rates (6.0% vs. 6.6%; p = 0.103). LM group had higher rates of 30- and 90-day mortality (4.3% vs. 0.3% and 8.6% vs. 1.8%, respectively; p < 0.0001), but a slightly shorter hospitalization (7.70±8.64 vs. 7.92±7.07; p = 0.024) Median overall survival was not different between the groups (27.3 vs. 25.36 months; p = 0.214). Conclusions: Surgery with systemic and IP chemotherapy can be a viable treatment option in stage IV CRC patients with PC with comparable short-term and survival outcomes to the widely accepted liver resection in patients with isolated LM.