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World Journal of Surgical Oncology
Published in: World Journal of Surgical Oncology 1/2019

Open Access 01-12-2019 | Polymerase Chain Reaction | Review

Is microsatellite instability-high really a favorable prognostic factor for advanced colorectal cancer? A meta-analysis

Authors: Bingyan Wang, Fei Li, Xin Zhou, Yanpeng Ma, Wei Fu

Published in: World Journal of Surgical Oncology | Issue 1/2019

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Abstract

Background

Stage II colorectal cancer with microsatellite instability-high (MSI-H) has been proven to have a better prognosis. However, in advanced stage, this trend remains controversial. This study aimed to explore the prognostic role of MSI-H in stage III and IV colorectal cancer (CRC) through meta-analysis.

Methods

A comprehensive search was performed in PubMed, Cochrane Central Library, and Embase databases. All randomized clinical trials and non-randomized studies were included based on inclusion and exclusion criteria and on survival after a radical operation with or without chemotherapy. The adjusted log hazard ratios (HRs) were used to estimate the prognostic value between MSI-H and microsatellite-stable CRCs. The random-effects model was used to estimate the pooled effect size.

Results

Thirty-six studies were included. Randomized controlled trials (RCT) and non-RCT were analyzed separately. For stage III CRCs, pooled HR for overall survival (OS) was 0.96 (95% confidence interval [CI] 0.75–.123) in the RCT subgroup and 0.89 (95% CI 0.62–1.28) in the non-RCT subgroup. For disease-free survival (DFS), the HR for the RCT group was 0.83 (95% CI 0.65–1.07), similar to the non-RCT subgroup (0.83, 95% CI 0.65–1.07). Disease-specific survival (DSS) was also calculated, which had an HR of 1.07 (95% CI 0.68–1.69) in the non-RCT subgroup. All these results showed that MSI-H has no beneficial effects in stage III CRC. For stage IV CRC, the HR for OS in the RCT subgroup was 1.23 (95% CI 0.92–1.64) but only two RCTs were included. For non-RCT study, the combined HR for OS and DFS was 1.10 (95% CI 0.77–1.51) and 0.72 (95% CI 0.53–0.98), respectively, suggesting the beneficial effect for DFS and non-beneficial effect for OS.

Conclusion

For stage III CRC, MSI-H had no prognostic effect for OS, DFS, and DSS. For stage IV CRC, DFS showed a beneficial result, whereas OS did not; however, the included studies were limited and needed further exploration.
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Metadata
Title
Is microsatellite instability-high really a favorable prognostic factor for advanced colorectal cancer? A meta-analysis
Authors
Bingyan Wang
Fei Li
Xin Zhou
Yanpeng Ma
Wei Fu
Publication date
01-12-2019
Publisher
BioMed Central
Published in
World Journal of Surgical Oncology / Issue 1/2019
Electronic ISSN: 1477-7819
DOI
https://doi.org/10.1186/s12957-019-1706-5

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