title: Low incidence of point mutation at codon 12 of K-ras proto-oncogene in squamous cell carcinoma of the upper aerodigestive tract.
abstract: Forty-two cases of squamous cell carcinoma arising in the upper aerodigestive tract were examined to determine the incidence and type of point mutation in codon 12 of the c-K-ras gene by using the polymerase chain reaction and oligonucleotide hybridization techniques on DNA extracted from paraffin blocks. DNA sequencing, in addition, was performed in 4 cases. No point mutation was detected in codon 12 of c-K-ras in the 42 squamous cell carcinomas we examined. According to the results of DNA sequencing of 4 cases, codon 13 also revealed no point mutation. Thus, point mutational activation of codon 12 of c-K-ras oncogene is an uncommon event in human upper aerodigestive tract squamous cell carcinoma.
authors.affiliation: Department of Pathology and Laboratory Medicine, University of Cincinnati Medical Center, Ohio.
authors.forename: T
authors.initials: T
authors.lastname: Hirano
authors.forename: P E
authors.initials: PE
authors.lastname: Steele
authors.forename: J L
authors.initials: JL
authors.lastname: Gluckman
mesh_terms: D000328:Adult; D000368:Aged; D001483:Base Sequence; D002294:Carcinoma, Squamous Cell / Q000235:genetics*; D003062:Codon / Q000235:genetics*; D004273:DNA, Neoplasm / Q000235:genetics; D005260:Female; D005786:Gene Expression Regulation; D006801:Humans; D007822:Laryngeal Neoplasms / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D009062:Mouth Neoplasms / Q000235:genetics*; D009154:Mutation; D009693:Nucleic Acid Hybridization; D015345:Oligonucleotide Probes; D010610:Pharyngeal Neoplasms / Q000235:genetics*; D016133:Polymerase Chain Reaction; D000090063:Proto-Oncogene Mas; D016283:Proto-Oncogene Proteins p21(ras) / Q000235:genetics*
chemical_list: D003062:Codon; D004273:DNA, Neoplasm; C000715470:MAS1 protein, human; D015345:Oligonucleotide Probes; D000090063:Proto-Oncogene Mas; C501009:HRAS protein, human; D016283:Proto-Oncogene Proteins p21(ras)