Journal of Clinical Oncology, Vol 23, No 3 (January 20), 2005: pp. 609-618
© 2005 American Society of Clinical Oncology.
DOI: 10.1200/JCO.2005.01.086
Systematic Review of Microsatellite Instability and Colorectal Cancer Prognosis
S. Popat,
R. Hubner,
R.S. Houlston
From the Section of Cancer Genetics, Institute of Cancer Research, Sutton, UK
Address reprint requests to Sanjay Popat, MRCP, PhD, Institute of Cancer Research, Brookes Lawley Building, Sutton, Surrey SM2 5NG, UK; e-mail: sanjay.popat{at}icr.ac.uk
PURPOSE: A number of studies have investigated the relationship between microsatellite instability (MSI) and colorectal cancer (CRC) prognosis. Although many have reported a better survival with MSI, estimates of the hazard ratio (HR) among studies differ. To derive a more precise estimate of the prognostic significance of MSI, we have reviewed and pooled data from published studies.
METHODS: Studies stratifying survival in CRC patients by MSI status were eligible for analysis. The principal outcome measure was the HR. Data from eligible studies were pooled using standard techniques.
RESULTS: Thirty-two eligible studies reported survival in a total of 7,642 cases, including 1,277 with MSI. There was no evidence of publication bias. The combined HR estimate for overall survival associated with MSI was 0.65 (95% CI, 0.59 to 0.71; heterogeneity P = .16; I2 = 20%). This benefit was maintained restricting analyses to clinical trial patients (HR = 0.69; 95% CI, 0.56 to 0.85) and patients with locally advanced CRC (HR = 0.67; 95% CI, 0.58 to 0.78). In patients treated with adjuvant fluorouracil (FU) CRCs with MSI had a better prognosis (HR = 0.72; 95% CI, 0.61 to 0.84). However, while data are limited, tumors with MSI derived no benefit from adjuvant FU (HR = 1.24; 95% CI, 0.72 to 2.14).
CONCLUSION: CRCs with MSI have a significantly better prognosis compared to those with intact mismatch repair. Additional studies are needed to further define the benefit of adjuvant chemotherapy in locally advanced tumors with MSI.
Supported by the UK Department of Health (S.P.) and grants from Cancer Research UK and the Association for International Cancer Research (R.S.H.).
Authors disclosures of potential conflicts of interest are found at the end of this article.

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