%0 Journal Article
%T Microsatellite instability should not determine candidacy for cytoreductive surgery and hyperthermic intraperitoneal chemoperfusion in patients with peritoneal metastases from colorectal cancer.
%A Ruff SM
%A Hall LB
%A Choudry MH
%A Pingpank J
%A Holtzman M
%A Bartlett DL
%A Kim AC
%A Ongchin M
%J J Gastrointest Surg
%V 0
%N 0
%D 2024 Jun 24
%M 38925340
%F 3.267
%R 10.1016/j.gassur.2024.06.019
%X <B>BACKGROUND: </B>Cytoreductive surgery (CRS) plus hyperthermic intraperitoneal chemotherapy (HIPEC) is a multimodal therapeutic option for the management of peritoneal metastases (PM). Treatment outcomes for patients with colorectal cancer (CRC) PM undergoing CRS+HIPEC with microsatellite instability (MSI) remain unknown. We examined the patient characteristics and outcomes in patients with MSI CRC after CRS+HIPEC.<BR><B>METHODS: </B>This was a retrospective cohort study of a prospectively maintained database of all patients with CRC PM undergoing CRS+HIPEC (2010-2020). Categorical and continuous variables were analyzed using the chi-square test and independent samples t test, respectively. Survival was evaluated with the Kaplan-Meier analysis.<BR><B>RESULTS: </B>There were 324 patients diagnosed as having CRC PM undergoing CRS+HIPEC (MSI, n = 23; microsatellite stable [MSS], n = 301). There was no statistically significant difference in patient demographics, tumor characteristics, or perioperative factors between the 2 groups. There was a trend toward improved survival in the MSI group with a median overall survival (OS) of 96.7 month compared with patients with MSS disease (median OS, 51.4 months; P = .10). Patients with MSI demonstrated median progression-free survival (PFS) 8.5 months compared with 11.4 months in the MSS cohort (P = .28).<BR><B>CONCLUSIONS: </B>Patients with CRC PM, regardless of MSI or MSS status, demonstrate similar OS and PFS after CRS+HIPEC. MSI status should not change a patient's candidacy for CRS+HIPEC.