title: An autosome-wide scan for linkage disequilibrium-based association in sporadic breast cancer cases in eastern Finland: three candidate regions found.
abstract: Breast cancer is the most common of cancers among women in industrialized countries. Many of breast cancer risk factors are known, but the majority of the genetic background is still unknown. Linkage disequilibrium-based association is a powerful tool for mapping disease genes and is suitable for mapping complex traits in founder populations. We report the results of a two-stage, autosome-wide scan for LD with breast cancer. Our aim was to identify genetic risk factors for sporadic breast cancer in an eastern Finnish population. Our case-control set is from the province of northern Savo in the late-settlement area of eastern Finland. This population is relatively young and genetically homogeneous. We used 435 autosomal microsatellite markers spaced by an average of 10 cM in a set of 49 breast cancer cases and 50 controls. In the first-stage scan, we found 21 markers in LD with breast cancer (Ps = 0.003-0.046, Fisher's exact test). In the second-stage scan with markers flanking 21 positive loci, four significant markers were found (Ps = 0.013-0.046, Fisher's exact test). Haplotype analysis using global score method with two, three, or four markers also revealed four positive marker combinations (simulated P for global score = 0.003-0.021). Our results suggest breast cancer-associated regions on 3p26, 11q23, and 22q13.1 in an eastern Finnish population.
authors.affiliation: Department of Pathology and Forensic Medicine, University of Kuopio, P.O. Box 1627, FI-70211 Kuopio, Finland. jaana@hartikainen@uku.fi
authors.forename: Jaana M
authors.initials: JM
authors.lastname: Hartikainen
authors.forename: Hanna
authors.initials: H
authors.lastname: Tuhkanen
authors.forename: Vesa
authors.initials: V
authors.lastname: Kataja
authors.forename: Alison M
authors.initials: AM
authors.lastname: Dunning
authors.forename: Antonis
authors.initials: A
authors.lastname: Antoniou
authors.forename: Paula
authors.initials: P
authors.lastname: Smith
authors.forename: Airi
authors.initials: A
authors.lastname: Arffman
authors.forename: Mia
authors.initials: M
authors.lastname: Pirskanen
authors.forename: Douglas F
authors.initials: DF
authors.lastname: Easton
authors.forename: Matti
authors.initials: M
authors.lastname: Eskelinen
authors.forename: Matti
authors.initials: M
authors.lastname: Uusitupa
authors.forename: Veli-Matti
authors.initials: VM
authors.lastname: Kosma
authors.forename: Arto
authors.initials: A
authors.lastname: Mannermaa
mesh_terms: D000328:Adult; D000368:Aged; D001943:Breast Neoplasms / Q000235:genetics*; D016022:Case-Control Studies; D002880:Chromosomes, Human, Pair 11 / Q000235:genetics; D002892:Chromosomes, Human, Pair 22 / Q000235:genetics; D002893:Chromosomes, Human, Pair 3 / Q000235:genetics; D005260:Female; D005387:Finland / Q000453:epidemiology; D005787:Gene Frequency; D005819:Genetic Markers; D020022:Genetic Predisposition to Disease; D005828:Genetics, Population; D015894:Genome, Human; D005838:Genotype; D006239:Haplotypes; D006801:Humans; D015810:Linkage Disequilibrium; D018895:Microsatellite Repeats / Q000235:genetics; D008875:Middle Aged; D012307:Risk Factors
chemical_list: D005819:Genetic Markers