Open AccessFrequent Somatic Mutations of the APC and p53 Genes in Sporadic Ampullary Carcinomas
Author(s) -
Imai Yasuo,
Oda Hideaki,
Tsurutani Naomi,
Nakatsuru Yoko,
Inoue Tohru,
Ishikawa Takatoshi
Publication year - 1997
Publication title -
japanese journal of cancer research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.035
H-Index - 141
eISSN - 1349-7006
pISSN - 0910-5050
DOI - 10.1111/j.1349-7006.1997.tb00460.x
Subject(s) - adenomatous polyposis coli , loss of heterozygosity , familial adenomatous polyposis , biology , missense mutation , locus (genetics) , genetics , gene , gene mutation , carcinogenesis , germline mutation , cancer research , mutation , colorectal cancer , allele , cancer
Although a close relation of somatic mutations of the adenomatous polyposis coli gene with ampullary carcinomas in familial adenomatous polyposis patients has been reported, the possible association with sporadic ampullary neoplasms has not been fully examined. We have therefore investigated loss of heterozygosity at the adenomatous polyposis coli locus and the mutational status of a portion of the adenomatous polyposis coli gene, including the mutation cluster region, in 17 ampullary carcinomas of non–familial adenomatous polyposis patients. Alteration of the adenomatous polyposis coli gene was found in 8 of 17 (47.1%) cases, as missense or insertion mutations, with or without loss of heterozygosity. Additional investigation of ⁁53 (cxons 5–8) and K–ras (codons 12 and 13) gene mutations revealed a striking mutational pattern of thep53 gene. Nine of the 17 cases demonstrated a total of 12 mutations, 6 clustered at codon 189 and 3 at codon 166. Furthermore, 5 of the 12 mutations were nonsense mutations. Regarding the K–ras gene, 4 of the 17 (23.5%) cases had mutations in codon 12, 3 of the 4 cases being derived from the intraduodenal bile duct. The findings indicate that alterations of the adenomatous polyposis coli and the p53 genes are relatively frequent in sporadic ampullary carcinomas. In particular, the clustering at specific p53 codons might offer an etiological clue to clarify ampullary carcinogenesis. Mutations of the K–ras gene, on the other hand, might be characteristic of intraduodenal bile duct origin.