Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.23/454
Título: A comparison of microsatellite instability in early onset gastric carcinomas from relatively low and high incidence European populations.
Autor: Hayden, JD
Cawkwell, L
Dixon, MF
Pardal, F
Murgatroyd, H
Gray, S
Quirke, P
Martin, IG
Palavras-chave: Repetições de Microssatélites
Neoplasias do Estômago
Data: 2000
Editora: Wiley
Citação: Int J Cancer. 2000;85(2):189-91.
Resumo: We have investigated the genetic basis of gastric carcinomas occurring in patients aged under 40 years from a Portuguese population with a relatively high incidence of gastric cancer. We analysed a panel of 12 microsatellite loci in DNA extracted from gastric carcinomas arising in 16 patients aged 24-39 years from Braga, Portugal. Overall, microsatellite instability (MI) in at least 1 locus was detected in 44% (7 of 16) of carcinomas. A single patient demonstrated a mutator phenotype suggestive of the hereditary nonpolyposis colorectal cancer syndrome with instability in 82% of loci. This carcinoma showed loss of expression of the hMLH1 mismatch repair protein. In a previous study, we found no evidence of MI among 10 cases of early onset gastric carcinomas from an English population, which has a relatively low incidence of gastric cancer. Comparing the 2 series, we found that there was a significant difference (p = 0.04) in the prevalence of MI (at least 1 marker affected). This geographical difference in low-level MI may be related to a significantly higher prevalence of background chronic atrophic gastritis (8 of 16 vs. 0 of 8) and Helicobacter pylori infection (15 of 16 vs. 2 of 8) in Portuguese carcinomas compared with English cases. Genetic mechanisms underlying the hereditary non-polyposis colorectal cancer syndrome may play a role in a small number of early onset gastric carcinomas. The difference in prevalence of low-level MI between these relatively high and low incidence European populations requires further investigation.
Peer review: yes
URI: http://comum.rcaap.pt/handle/123456789/4406
http://hdl.handle.net/10400.23/454
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