title: A relationship between K-ras gene mutations and some clinical and histologic variables in patients with primary colorectal carcinoma.
abstract: Mutations in the Kirsten ras 2 (K-ras) gene were described as early events in the process of colorectal carcinogenesis. The aim of this study was to find a possible relationship between the presence of K-ras mutation in samples of primary colorectal carcinomas and the clinico-pathological data of the investigated patients. Mutation in codon 12 of the K-ras gene was determined in 18 of 53 colorectal carcinomas (34%) in our group of patients. The presence of K-ras gene mutations was not related to gender, age of subject at diagnosis, staging or cancer location (p > 0.05). Sixteen of the 42 (38%) moderately differentiated carcinomas, and two of the eight (25%) well differentiated carcinomas contained K-ras mutation in codon 12, but none of the three poorly differentiated carcinomas contained the mutation. Moderately differentiated tumours contained an aspartate code GAT (in eight cases), a valine code GTT (in six cases), an alanine code GCT (in one case) and a serine code AGT (in one case) in codon 12. Well differentiated tumours contained only the valine code GTT (two cases). Our results show that the frequency of mutations in the K-ras gene in carcinomas in Central Europe is not different from the frequencies found in other parts of the world. The homogeneous incidence of K-ras mutation does not seem to be related to ethnic factors, dietary habits, or the composition of the diet.
authors.affiliation: Institute of Clinical Biochemistry and Diagnostics, University Hospital, Hradec Králové, Czech Republic.
authors.forename: M
authors.initials: M
authors.lastname: Beránek
authors.forename: J
authors.initials: J
authors.lastname: Bures
authors.forename: V
authors.initials: V
authors.lastname: Palicka
authors.forename: P
authors.initials: P
authors.lastname: Jandík
authors.forename: F
authors.initials: F
authors.lastname: Langr
authors.forename: E
authors.initials: E
authors.lastname: Nejedlá
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003062:Codon / Q000235:genetics; D015179:Colorectal Neoplasms / Q000235:genetics* / Q000473:pathology; D005260:Female; D011905:Genes, ras / Q000235:genetics*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009154:Mutation
chemical_list: D003062:Codon