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. 2000 Mar;91(3):293–300. doi: 10.1111/j.1349-7006.2000.tb00944.x

Mapping of Target Regions of Allelic Loss in Primary Breast Cancers to 1‐cM Intervals on Genomic Contigs at 6q21 and 6q25.3

Yoshihito Utada 1,2,3, Shunsuke Haga 2, Tetsuro Kajiwara 2, Fujio Kasumi 3, Goi Sakamoto 3, Yusuke Nakamura 4, Mitsuru Emi 1,✉
PMCID: PMC5926368  PMID: 10760688

Abstract

Allelic losses on the long arm of human chromosome 6 are frequently observed in cancers of the ovary, prostate, and breast. To identify the locations of putative tumor suppressor genes on 6q, we examined 192 primary breast cancers for patterns of allelic loss at 16 polymorphic microsatellite loci distributed along this chromosome arm. Allelic losses at one or more loci were observed in 105 (55%) of the tumors examined. Detailed deletion mapping with appropriate yeast artificial chromosome (YAC) contigs identified two distinct commonly deleted regions; one was confined to a 1‐cM interval at 6q21 flanked by D6S1040 and D6S262 and the other to a 1‐cM interval at 6q25.3 flanked by D6S305 and D6S411. Allelic losses at 6q21 were more frequent in invasive solid tubular and scirrhous carcinomas than in tumors of less aggressive histologic types (P=0.0006). Allelic loss at 6q25.3 was associated with loss of progesterone receptor (P=0.0256). Our results suggest the presence of two tumor suppressor genes for breast cancer on 6q that are likely to be associated with tumor progression and/or loss of hormonal dependency.

Keywords: Breast cancer, Loss of heterozygosity, Tumor suppressor gene, Chromosome 6, Yeast artificial chromosome (YAC)

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