The clinicopathological significance of SIRT1 expression in colon cancer: An immunohistochemical study and meta-analysis.

Objective: The aim of this study was to determine the clinicopathological significance and potential prognostic role of SIRT1 expression in colorectal cancer (CRC) using immunohistochemistry and meta-analysis.
Methods: Immunohistochemistry was performed on 265 archival paraffin-embedded human CRC specimens to investigate the correlation between SIRT1 expression and clinicopathological characteristics, including patient survival. To elucidate the potential prognostic value of SIRT1 expression, a meta-analysis was performed using data on 2132 patients from eight eligible studies.
Results: SIRT1 was highly expressed in 24.5% of the 265 CRC specimens analyzed. High SIRT1 expression correlated with vascular invasion (P =  0.041). High SIRT1 expression also significantly correlated with expression of SNAI (P =  0.001), but not E-cadherin (P =  0.958). However, there was no significant correlation between SIRT1 expression and other clinicopathological parameters. High SIRT1 expression in the CRC specimens significantly correlated with a worse overall survival rate, independent of SNAI expression. However, based on the meta-analysis, high SIRT1 expression was not significantly correlated with overall survival rates [hazard ratio (HR) 1.111, 95% confidential interval (CI) 0.799-1.544].
Conclusion: In our retrospective study, high SIRT1 expression significantly correlated with vascular invasion and a worse prognosis. However, because the results from the meta-analysis differed the retrospective arm of our study, additional cumulative studies are needed to determine the prognostic value of SIRT1 in CRC.
(Copyright © 2018. Published by Elsevier GmbH.)