RAD51 135G→C modifies breast cancer risk among BRCA2 mutation carriers: Results from a combined analysis of 19 studies
RAD51 135G→C modifies breast cancer risk among BRCA2 mutation carriers: Results from a combined analysis of 19 studies
RAD51 is an important component of double-stranded DNA-repair mechanisms that interacts with both BRCA1 and BRCA2. A single-nucleotide polymorphism (SNP) in the 5′ untranslated region (UTR) of RAD51, 135G→C, has been suggested as a possible modifier of breast cancer risk in BRCA1 and BRCA2 mutation carriers. We pooled genotype data for 8,512 female mutation carriers from 19 studies for the RAD51 135G→C SNP. We found evidence of an increased breast cancer risk in CC homozygotes (hazard ratio [HR] 1.92 [95% confidence interval {CI} 1.25-2.94) but not in heterozygotes (HR 0.95 [95% CI 0.83-1.07]; P = .002, by heterogeneity test with 2 degrees of freedom [df]). When BRCA1 and BRCA2 mutation carriers were analyzed separately, the increased risk was statistically significant only among BRCA2 mutation carriers, in whom we observed HRs of 1.17 (95% CI 0.91-1.51) among heterozygotes and 3.18 (95% CI 1.39-7.27) among rare homozygotes (P = .007, by heterogeneity test with 2 df). In addition, we determined that the 135G→C variant affects RAD51 splicing within the 5′ UTR. Thus, 135G→C may modify the risk of breast cancer in BRCA2 mutation carriers by altering the expression of RAD51. RAD51 is the first gene to be reliably identified as a modifier of risk among BRCA1/2 mutation carriers.
1186-1200
Antoniou, Antonis C.
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Sinilnikova, Olga M.
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Simard, Jacques
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Léoné, Mélanie
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Dumont, Martine
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Neuhausen, Susan L.
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Struewing, Jeffery P.
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Stoppa-Lyonnet, Dominique
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Barjhoux, Laure
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Hughes, David J.
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Coupier, Isabelle
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Belotti, Muriel
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Lasset, Christine
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Bonadona, Valérie
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Bignon, Yves Jean
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Rebbeck, Timothy R.
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Wagner, Theresa
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Lynch, Henry T.
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Domchek, Susan M.
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Nathanson, Katherine L.
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Garber, Judy E.
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Weitzel, Jeffrey
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Narod, Steven A.
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Tomlinson, Gail
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Olopade, Olufunmilayo I.
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Godwin, Andrew
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Isaacs, Claudine
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Jakubowska, Anna
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Lubinski, Jan
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Gronwald, Jacek
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Górski, Bohdan
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Byrski, Tomasz
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Huzarski, Tomasz
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Peock, Susan
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Cook, Margaret
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Baynes, Caroline
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Murray, Alexandra
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Rogers, Mark
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Daly, Peter A.
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Dorkins, Huw
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Schmutzler, Rita K.
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Versmold, Beatrix
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Engel, Christoph
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Meindl, Alfons
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Arnold, Norbert
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Niederacher, Dieter
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Deissler, Helmut
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Evans, Gareth
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Eccles, Diana
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Lucassen, Anneke
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Genetic Modifiers of Cancer Risk in BRCA1/2 Mutation Carriers Study (GEMO)
9 January 2008
Antoniou, Antonis C.
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Sinilnikova, Olga M.
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Simard, Jacques
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Léoné, Mélanie
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Dumont, Martine
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Neuhausen, Susan L.
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Struewing, Jeffery P.
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Stoppa-Lyonnet, Dominique
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Barjhoux, Laure
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Hughes, David J.
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Coupier, Isabelle
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Belotti, Muriel
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Lasset, Christine
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Bonadona, Valérie
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Bignon, Yves Jean
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Rebbeck, Timothy R.
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Wagner, Theresa
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Lynch, Henry T.
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Domchek, Susan M.
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Nathanson, Katherine L.
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Garber, Judy E.
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Weitzel, Jeffrey
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Narod, Steven A.
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Tomlinson, Gail
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Olopade, Olufunmilayo I.
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Godwin, Andrew
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Isaacs, Claudine
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Jakubowska, Anna
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Lubinski, Jan
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Gronwald, Jacek
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Górski, Bohdan
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Byrski, Tomasz
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Huzarski, Tomasz
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Peock, Susan
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Cook, Margaret
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Baynes, Caroline
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Murray, Alexandra
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Rogers, Mark
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Daly, Peter A.
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Dorkins, Huw
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Schmutzler, Rita K.
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Versmold, Beatrix
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Engel, Christoph
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Meindl, Alfons
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Arnold, Norbert
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Niederacher, Dieter
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Deissler, Helmut
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Evans, Gareth
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Eccles, Diana
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Lucassen, Anneke
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