title: Mutations of Ki-ras oncogene codon 12 in betel quid chewing-related human oral squamous cell carcinoma in Taiwan.
abstract: In Taiwan, there are two million people who have a betel quid chewing habit, and approximately 80% of all oral cancer deaths are associated with this habit. To investigate the incidence and types of Ki-ras codon 12 mutations in oral cancer associated with betel quid chewing, we used a sensitive mutation-specific two-stage polymerase chain reaction (PCR) technique to examine human oral squamous cell carcinomas from formalin-fixed, paraffin-embedded tissues. DNA sequence analysis of PCR products revealed that 6 of 33 (18%) tumour specimens contained Ki-ras codon 12 mutations. Four of the tumours contained more than one mutation. Three different base changes were detected, resulting from a substitution of wild type glycine (GGT) to either serine (AGT), aspartic acid (GAT) or cysteine (TAT). These results indicate that Ki-ras oncogene activation may play a role in the oncogenesis of betel quid chewing-related human oral squamous cell carcinomas.
authors.affiliation: School of Dentistry, National Taiwan University, Taipei, ROC.
authors.forename: M Y
authors.initials: MY
authors.lastname: Kuo
authors.forename: J H
authors.initials: JH
authors.lastname: Jeng
authors.forename: C P
authors.initials: CP
authors.lastname: Chiang
authors.forename: L J
authors.initials: LJ
authors.lastname: Hahn
mesh_terms: D000328:Adult; D001114:Areca; D001483:Base Sequence; D002294:Carcinoma, Squamous Cell / Q000209:etiology / Q000235:genetics*; D003062:Codon; D004252:DNA Mutational Analysis; D004273:DNA, Neoplasm / Q000235:genetics; D011905:Genes, ras / Q000235:genetics*; D006801:Humans; D008297:Male; D008875:Middle Aged; D008969:Molecular Sequence Data; D009061:Mouth Mucosa / Q000473:pathology; D009062:Mouth Neoplasms / Q000209:etiology / Q000235:genetics*; D009154:Mutation; D010946:Plants, Medicinal; D016133:Polymerase Chain Reaction; D019966:Substance-Related Disorders / Q000150:complications
chemical_list: D003062:Codon; D004273:DNA, Neoplasm