Multiple regions with allelic loss at chromosome 3 in superficial multifocal bladder tumors.

Abstract:

:We have examined six patients with multiple low grade, low stage superficial multifocal bladder tumors with surrounding tissues for loss of heterozygosity (LOH) and microsatellite instability at chromosome 3, totaling 76 samples. The majority (4/5) of the patients had LOH at or close to the fragile histidine triad (FHIT) gene (3p14.2; D3S1300), which is a candidate tumor suppressor gene for many cancer types. One patient showed a consistent LOH with four adjacent markers around FHIT region in all the tumors whereas in the corresponding surrounding tissues the heterozygosity was retained. In addition to the region near FHIT, two other regions had frequent allelic losses - one near the p telomere (3p25-26; D3S3050) and another near the q telomere (3q27; D3S2418). The largest numbers of LOH in the surrounding tissues were found at these regions (3/5 at D3S3050 and 2/5 at D3S2418). The D3S3050 marker is located at 3p26-3p25, near the Von Hippel-Lindau (VHL) tumor suppressor gene locus. LOH that were more random were found at 3q21.3-25.2 (D3S1744) and at 3p12-3p11 (D3S2465). Taken together, at least three regions at chromosome 3p25-26, 3p14.2 and 3q27 seem to have frequent loss of heterozygosity in multifocal superficial bladder tumors. We also performed a phylogenetic-type analysis to find out common changes and the degree of heterogeneity. The overall heterogeneity was low within a given patient: in all cases the majority of the tumor samples arranged in a single branch with a common origin. This point of origin varied from patient to patient, which is compatible with the earlier studies demonstrating the heterogeneity of the single primary bladder tumors. However, the phylogenetic-type analysis suggests that the FHIT region contains often the very first alterations at chromosome 3.

journal_name

Int J Oncol

authors

Louhelainen J,Wijkström H,Hemminki K

doi

10.3892/ijo.18.1.203

keywords:

subject

Has Abstract

pub_date

2001-01-01 00:00:00

pages

203-10

issue

1

eissn

1019-6439

issn

1791-2423

journal_volume

18

pub_type

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