title: High incidence of ras gene mutation in intrahepatic cholangiocarcinoma.
abstract: The DNA sequences around codons 12, 13, and 61 of the ras gene were analyzed by polymerase chain reaction and direct sequencing in 18 intrahepatic cholangiocarcinomas. The ras gene mutations were found in 9 of 18 (50%): 6 in K-ras codon 12, 1 in K-ras codon 13, 1 in K-ras codon 61, and 1 in N-ras codon 12. The incidence of mutations was higher in the hilar type of intrahepatic cholangiocarcinomas, especially when these tumors were large. The incidence and spectrum of the mutations were almost the same as those reported in colon cancers, possibly indicating similar etiologic agent(s) in the carcinogenesis of both cancers.
authors.affiliation: First Department of Medicine, Chiba University School of Medicine, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Tada
authors.forename: M
authors.initials: M
authors.lastname: Omata
authors.forename: M
authors.initials: M
authors.lastname: Ohto
mesh_terms: D000230:Adenocarcinoma / Q000235:genetics*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001483:Base Sequence; D004273:DNA, Neoplasm / Q000032:analysis*; D005260:Female; D011905:Genes, ras / Q000235:genetics*; D006801:Humans; D008113:Liver Neoplasms / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D008969:Molecular Sequence Data; D009154:Mutation / Q000235:genetics; D016133:Polymerase Chain Reaction
chemical_list: D004273:DNA, Neoplasm