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Obesity-Colorectal Tumors Link Restricted to Microsatellite Stability
Peter T. Campbell, of the Epidemiology Research Program at the American Cancer Society in Atlanta, and colleagues performed a case-control study of subjects with incident colorectal cancer and their unaffected sex-matched siblings to evaluate associations between being overweight or obese (defined according to body mass index) and adult weight change and colorectal cancer risk.
They evaluated the associations with cancer risk, overall and by tumor MSI status, assessed at up to 10 markers for microsatellite stability.
Patients that are diagnosed with tumors that are microsatellite-stable or MSI-low have lower 5-year survival rates than patients with tumors that are MSI-high.
Recent body mass index (people over 30 kg/m2 or more, the cut off for obesity) was positively associated with overall risk of colorectal cancer for men and women combined.
It was also associated with risk of MS-stable and MSI-low colorectal tumors, but not with the risk of MSI-high tumors.
"Our data also suggest that the associations between [body mass index] and adult weight gain and the risk of colorectal cancer differ between MS-stable and MSI-high tumors... suggesting differing underlying etiologies for colorectal cancer according to tumor MSI," the authors said.
The study has been published online March 8 in the Journal of the National Cancer Institute.
Source-ANI
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