title: Relationship of Ki-ras mutations in colon cancers to tumor location, stage, and survival: a population-based study.
abstract: Some previous studies have demonstrated significant results between Ki-ras mutations and tumor stage, survival, and/or other clinical variables, whereas others have not. We therefore evaluated the significance of codons 12 and 13 Ki-ras mutations in a large population-based study of 1413 individuals with colon cancer. Ki-ras mutations were identified in approximately 32% of tumors. Codon 12 mutations were significantly more common in proximal than distal tumors (29.1% versus 20.5%; P < 0.01) and in tumors of advanced stage. Tumors from men were more likely to have transition mutations and codon 12 G-->A mutations. After adjusting for age and stage, the codon 13 G-->A mutation was associated with a 40% (95% confidence interval, 0.95-2.0) increase in short-term mortality from colon cancer. In conclusion, this population-based study demonstrates important relationships between Ki-ras mutations and stage, survival, tumor location, and gender.
authors.affiliation: Department of Pathology, Kaiser Permanente Medical Care Program, Oakland, California, USA.
authors.forename: W S
authors.initials: WS
authors.lastname: Samowitz
authors.forename: K
authors.initials: K
authors.lastname: Curtin
authors.forename: D
authors.initials: D
authors.lastname: Schaffer
authors.forename: M
authors.initials: M
authors.lastname: Robertson
authors.forename: M
authors.initials: M
authors.lastname: Leppert
authors.forename: M L
authors.initials: ML
authors.lastname: Slattery
mesh_terms: D000328:Adult; D000368:Aged; D003062:Codon; D015331:Cohort Studies; D003110:Colonic Neoplasms / Q000235:genetics* / Q000473:pathology; D004252:DNA Mutational Analysis; D005260:Female; D016368:Frameshift Mutation; D011905:Genes, ras / Q000235:genetics*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D011379:Prognosis; D012737:Sex Factors; D016019:Survival Analysis
chemical_list: D003062:Codon