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Am J Pathol. Mar 1998; 152(3): 815–819.
PMCID: PMC1858406

Allelic loss of chromosomal arm 8p in breast cancer progression.

Abstract

Loss of heterozygosity (LOH) of chromosomal arm 8p has been reported to occur at high frequency for a number of common forms of human cancer, including breast cancer. The objectives of this study were to define the regions on this chromosomal arm that are likely to contain breast cancer tumor suppressor genes and to determine when loss of chromosomal arm 8p occurs during breast cancer progression. For mapping the tumor suppressor gene loci, we evaluated 60 cases of infiltrating ductal cancer for allelic loss using 14 microsatellite markers mapped to this chromosomal arm and found LOH of 8p in 36 (60%) of the tumors. Whereas most of these tumors had allelic loss at all informative markers, five tumors had partial loss of 8p affecting two nonoverlapping regions. LOH for all but one of the tumors with 8p loss involved the region between markers D8S560 and D8S518 at 8p21.3-p23.3, suggesting that this is the locus of a breast cancer tumor suppressor gene. We then studied LOH of 8p in 38 cases of ductal carcinoma in situ (DCIS) with multiple individually microdissected tumor foci evaluated for each case. LOH of 8p was found in 14 of the DCIS cases (36%), including 6 of 16 cases of low histological grade and 8 of 22 cases of intermediate or high histological grade. In four of these DCIS cases, 8p LOH was seen in some but not all of the multiple tumor foci examined. These data suggest that during the evolution of these tumors, LOH of 8p occurred after loss of other chromosomal arms that were lost in all tumor foci. Thus, LOH of 8p, particularly 8p21.3-p23, is a common genetic alteration in infiltrating and in situ breast cancer. Although 8p LOH is common even in low histological grade DCIS, this allelic loss often appears to be preceded by loss of other alleles in the evolution of breast cancer.

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