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Original Article
Volume 342:69-77 January 13, 2000 Number 2
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Tumor Microsatellite Instability and Clinical Outcome in Young Patients with Colorectal Cancer
Robert Gryfe, M.D., Hyeja Kim, M.Sc., Eugene T.K. Hsieh, M.D., Melyssa D. Aronson, M.Sc., Eric J. Holowaty, M.D., Shelley B. Bull, Ph.D., Mark Redston, M.D., and Steven Gallinger, M.D.

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ABSTRACT

Background Colorectal cancer can arise through two distinct mutational pathways: microsatellite instability or chromosomal instability. We tested the hypothesis that colorectal cancers arising from the microsatellite-instability pathway have distinctive clinical attributes that affect clinical outcome.

Methods We tested specimens of colorectal cancer from a population-based series of 607 patients (50 years of age or younger at diagnosis) for microsatellite instability. We compared the clinical features and survival of patients who had colorectal cancer characterized by high-frequency microsatellite instability with these characteristics in patients who had colorectal cancers with microsatellite stability.

Results We found high-frequency microsatellite instability in 17 percent of the colorectal cancers in 607 patients, and in a multivariate analysis, microsatellite instability was associated with a significant survival advantage independently of all standard prognostic factors, including tumor stage (hazard ratio, 0.42; 95 percent confidence interval, 0.27 to 0.67; P< 0.001). Furthermore, regardless of the depth of tumor invasion, colorectal cancers with high-frequency microsatellite instability had a decreased likelihood of metastasizing to regional lymph nodes (odds ratio, 0.33; 95 percent confidence interval, 0.21 to 0.53; P< 0.001) or distant organs (odds ratio, 0.49; 95 percent confidence interval, 0.27 to 0.89; P=0.02).

Conclusions High-frequency microsatellite instability in colorectal cancer is independently predictive of a relatively favorable outcome and, in addition, reduces the likelihood of metastases.


Source Information

From the Centre for Cancer Genetics (R.G., H.K., E.T.K.H., M.R., S.G.) and the Division of Clinical Epidemiology (S.B.B.), Samuel Lunenfeld Research Institute; the Departments of Surgery (R.G., M.D.A., S.G.), Laboratory Medicine and Pathobiology (E.T.K.H., M.R.), and Public Health Sciences (E.J.H., S.B.B.), University of Toronto; and Cancer Care Ontario (E.J.H.) — all in Toronto.

Address reprint requests to Dr. Gallinger at Mount Sinai Hospital, 600 University Ave., Suite 1225, Toronto, ON M5G 1X5, Canada, or at sgallinger{at}mtsinai.on.ca.

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Related Letters:

Microsatellite Instability in Colorectal Cancer
Ponz de Leon M., Roncucci L., Heinimann K., Müller H., Dobbie Z., Gryfe R., Redston M., Gallinger S.
Extract | Full Text  
N Engl J Med 2000; 342:1607-1608, May 25, 2000. Correspondence

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