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Nature genetics (3)
AuthorsGudbjartsson, Daniel F (3)Gudmundsson, Julius (3)
Kiemeney, Lambertus A (3)
Kong, Augustine (3)
Rafnar, Thorunn (3)
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Mutations in BRIP1 confer high risk of ovarian cancer.

Rafnar, Thorunn; Gudbjartsson, Daniel F; Sulem, Patrick; Jonasdottir, Aslaug; Sigurdsson, Asgeir; Jonasdottir, Adalbjorg; Besenbacher, Soren; Lundin, Pär; Stacey, Simon N; Gudmundsson, Julius; et al. (Nature Publishing Group, 2011-11)
Ovarian cancer causes more deaths than any other gynecologic malignancy in developed countries. Sixteen million sequence variants, identified through whole-genome sequencing of 457 Icelanders, were imputed to 41,675 Icelanders genotyped using SNP chips, as well as to their relatives. Sequence variants were tested for association with ovarian cancer (N of affected individuals = 656). We discovered a rare (0.41% allelic frequency) frameshift mutation, c.2040_2041insTT, in the BRIP1 (FANCJ) gene that confers an increase in ovarian cancer risk (odds ratio (OR) = 8.13, P = 2.8 × 10(-14)). The mutation was also associated with increased risk of cancer in general and reduced lifespan by 3.6 years. In a Spanish population, another frameshift mutation in BRIP1, c.1702_1703del, was seen in 2 out of 144 subjects with ovarian cancer and 1 out of 1,780 control subjects (P = 0.016). This allele was also associated with breast cancer (seen in 6/927 cases; P = 0.0079). Ovarian tumors from heterozygous carriers of the Icelandic mutation show loss of the wild-type allele, indicating that BRIP1 behaves like a classical tumor suppressor gene in ovarian cancer.
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Genome-wide association and replication studies identify four variants associated with prostate cancer susceptibility

Gudmundsson, Julius; Sulem, Patrick; Gudbjartsson, Daniel F; Blondal, Thorarinn; Gylfason, Arnaldur; Agnarsson, Bjarni A; Benediktsdottir, Kristrun R; Magnusdottir, Droplaug N; Orlygsdottir, Gudbjorg; Jakobsdottir, Margret; et al. (Nature Pub. Co., 2009-10-01)
We report a prostate cancer genome-wide association follow-on study. We discovered four variants associated with susceptibility to prostate cancer in several European populations: rs10934853[A] (OR = 1.12, P = 2.9 x 10(-10)) on 3q21.3; two moderately correlated (r2 = 0.07) variants, rs16902094[G] (OR = 1.21, P = 6.2 x 10(-15)) and rs445114[T] (OR = 1.14, P = 4.7 x 10(-10)), on 8q24.21; and rs8102476[C] (OR = 1.12, P = 1.6 x 10(-11)) on 19q13.2. We also refined a previous association signal on 11q13 with the SNP rs11228565[A] (OR = 1.23, P = 6.7 x 10(-12)). In a multivariate analysis using 22 prostate cancer risk variants typed in the Icelandic population, we estimated that carriers in the top 1.3% of the risk distribution are at a 2.5 times greater risk of developing the disease than members of the general population.
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A sequence variant at 4p16.3 confers susceptibility to urinary bladder cancer

Kiemeney, Lambertus A; Sulem, Patrick; Besenbacher, Soren; Vermeulen, Sita H; Sigurdsson, Asgeir; Thorleifsson, Gudmar; Gudbjartsson, Daniel F; Stacey, Simon N; Gudmundsson, Julius; Zanon, Carlo; et al. (Nature Pub. Co., 2010-05-01)
Previously, we reported germline DNA variants associated with risk of urinary bladder cancer (UBC) in Dutch and Icelandic subjects. Here we expanded the Icelandic sample set and tested the top 20 markers from the combined analysis in several European case-control sample sets, with a total of 4,739 cases and 45,549 controls. The T allele of rs798766 on 4p16.3 was found to associate with UBC (odds ratio = 1.24, P = 9.9 x 10(-12)). rs798766 is located in an intron of TACC3, 70 kb from FGFR3, which often harbors activating somatic mutations in low-grade, noninvasive UBC. Notably, rs798766[T] shows stronger association with low-grade and low-stage UBC than with more aggressive forms of the disease and is associated with higher risk of recurrence in low-grade stage Ta tumors. The frequency of rs798766[T] is higher in Ta tumors that carry an activating mutation in FGFR3 than in Ta tumors with wild-type FGFR3. Our results show a link between germline variants, somatic mutations of FGFR3 and risk of UBC.
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