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Increased breast cancer risk may be related to the HLA class III subregion.

Women's Health Weekly

| February 05, 2004 | COPYRIGHT 2004 NewsRX. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)Copyright

2004 FEB 5 - (NewsRx.com & NewsRx.net) -- Study results show a potential role of the HLA class III subregion in susceptibility to breast cancer.

According to a study from Netherlands, "BRCA1 and BRCA2 germline mutations account for

"The HLA region was genotyped with 24 microsatellite markers and markers for two single nucleotide polymorphisms (SNPs) in TNF-alpha and TNFbeta, in germline DNA from 956 breast cancer patients and 1271 family-based controls. Association analyses and the haplotype sharing statistic (HSS) were used to search for differences in haplotype sharing between patients and controls," wrote M.M. DeJong and colleagues, University of Groningen Medical Center.

"Based on criteria known to influence genetic breast cancer risk, patients were divided into groups of high, moderate, and low risk. The HSS revealed a significant difference in mean haplotype sharing between patients and controls for four consecutive markers (D6S2671, TNFa, D6S2672 and MICA), the highest being at D6S2671 (p=.017). Subgroup analyses showed that moderate-risk patients were responsible for this difference, with the strongest association for D6S2672 (p=.0009)," the researchers wrote.

"A single haplotype was more frequent and longer in moderate-risk patients than in controls. The results were confirmed with association analyses. Individuals homozygous for haplotype 110-184 (D6S2672-MICA) were observed in 9.0% of moderate-risk ...

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