Microsatellite instability and gastric non-invasive neoplasia in a high risk population in Cesena, Italy.

Abstract:

BACKGROUND/AIMS:In the natural history of gastric cancer, non-invasive neoplasia (NiN) precedes invasive carcinoma. A histological classification of gastric NiN has recently been proposed by a World Health Organisation international panel of experts. Genetic instability is known to be among the molecular pathways involved in gastric oncogenesis. In this retrospective cross sectional study, microsatellite instability (MSI) was analysed in a consecutive series of NiN and NiN related histological alterations from a northern Italian region at high risk for gastric cancer. PATIENTS/METHODS:Fifty five consecutive cases (indefinite for NiN, 29 cases; low grade NiN, 17 cases; high grade NiN, nine cases) were analysed by radioactive polymerase chain reaction and electrophoresis for microsatellite alterations at six loci (BAT25, BAT26, D2S123, D5S346, D17S250, and D3S1317). MSI was defined according to the Bethesda criteria distinguishing: (1) no instability in the analysed loci; (2) low frequency MSI (MSI-L); and (3) high frequency MSI (MSI-H). Immunohistochemical expression of MLH1 and MSH2 proteins was also analysed in all cases. RESULTS:Overall, MSI was found in 11 of 55 cases (indefinite for NiN, five of 29 (MSI-L, four; MSI-H, one); low grade NiN, three of 17 (MSI-L, one; MSI-H, two); high grade NiN, three of nine (MSI-L, one; MSI-H, two). CONCLUSIONS:In an Italian high risk area for gastric cancer, MSI is part of the spectrum of genetic alterations in gastric non-invasive neoplasia. In European populations at high risk of gastric cancer, DNA repair system alterations are thought to be among the early molecular events in gastric carcinogenesis.

journal_name

J Clin Pathol

authors

Rugge M,Bersani G,Bertorelle R,Pennelli G,Russo VM,Farinati F,Bartolini D,Cassaro M,Alvisi V

doi

10.1136/jcp.2004.025676

keywords:

subject

Has Abstract

pub_date

2005-08-01 00:00:00

pages

805-10

issue

8

eissn

0021-9746

issn

1472-4146

pii

58/8/805

journal_volume

58

pub_type

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