Abstract
Background Circulating biomarkers may be of value in providing additional prognostic information to the TNM staging system. Previous population-level studies suggest a prognostic role for pre-operative carcinoembryonic antigen (CEA). The purpose of this study is to verify the prognostic role of pre-operative CEA at the individual level, in a New Zealand cohort of colorectal cancer patients.
Methods Retrospective cohort study of patients undergoing potentially curative surgery for colorectal adenocarcinoma between 2010 and 2012 at a tertiary hospital in New Zealand. One hundred and thirty-nine patients had pre-operative CEA data available and were included in the study. The main outcomes measured were overall survival (OS) and disease-free survival (DFS) over a minimum of 5 years of follow up. Results Pre-operative CEA was requested in 138 out of 237 (58.2%) patients undergoing surgery. The median age was 71 years and median follow-up duration 61 months. High CEA was not associated with the incidence of disease recurrence (P = 0.69). A significant difference was found between high and low CEA for OS (P = 0.09) and DFS (P = 0.04). On multi-variate survival analysis, pre-operative CEA was identified as an independent predictor of OS (HR 2.50, 95% CI 1.17-5.36, P = 0.02) and DFS (HR 1.78, 95% CI 1.02-3.13, P = 0.04).
Conclusion We identified pre-operative CEA as an independent predictor of OS and DFS on an individual level. CEA offers additional prognostic value to TNM staging and should be requested routinely as part of the pre-operative work-up.