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- W1972719937 abstract "In Brief BACKGROUND: Cancers in the proximal colon, distal colon, and rectum are frequently studied together; however, there are biological differences in cancers across these sites, particularly in the prevalence of microsatellite instability. OBJECTIVE: We assessed the differences in survival by colon or rectal cancer site, considering the contribution of microsatellite instability to such differences. DESIGN: This is a population-based prospective cohort study for cancer survival. SETTINGS: This study was conducted within the Colon Cancer Family Registry, an international consortium. Participants were identified from population-based cancer registries in the United States, Canada, and Australia. PATIENTS: Information on tumor site, microsatellite instability, and survival after diagnosis was available for 3284 men and women diagnosed with incident invasive colon or rectal cancer between 1997 and 2002, with ages at diagnosis ranging from 18 to 74. MAIN OUTCOME MEASURES: Cox regression was used to calculate hazard ratios for the association between all-cause mortality and tumor location, overall and by microsatellite instability status. RESULTS: Distal colon (HR, 0.59; 95% CI, 0.49–0.71) and rectal cancers (HR, 0.68; 95% CI, 0.57–0.81) were associated with lower mortality than proximal colon cancer overall. Compared specifically with patients with proximal colon cancer exhibiting no/low microsatellite instability, patients with distal colon and rectal cancers experienced lower mortality, regardless of microsatellite instability status; patients with proximal colon cancer exhibiting high microsatellite instability had the lowest mortality. LIMITATIONS: Study limitations include the absence of stage at diagnosis and cause-of-death information for all but a subset of study participants. Some patient groups defined jointly by tumor site and microsatellite instability status are subject to small numbers. CONCLUSION: Proximal colon cancer survival differs from survival for distal colon and rectal cancer in a manner apparently dependent on microsatellite instability status. These findings support the premise that proximal colon, distal colon, and rectal cancers are clinicopathologically distinct. See related article on p. 935" @default.
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- W1972719937 date "2013-08-01" @default.
- W1972719937 modified "2023-10-15" @default.
- W1972719937 title "Colon and Rectal Cancer Survival by Tumor Location and Microsatellite Instability" @default.
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- W1972719937 doi "https://doi.org/10.1097/dcr.0b013e31828f9a57" @default.
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