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024 7 _ |a 10.1007/s10654-019-00485-7
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024 7 _ |a 0393-2990
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024 7 _ |a 1573-7284
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037 _ _ |a DKFZ-2019-00624
041 _ _ |a eng
082 _ _ |a 610
100 1 _ |a Kar, Siddhartha P
|0 0000-0002-2314-1426
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245 _ _ |a The association between weight at birth and breast cancer risk revisited using Mendelian randomisation.
260 _ _ |a Dordrecht [u.a.]
|c 2019
|b Springer Science + Business Media B.V.
336 7 _ |a article
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336 7 _ |a ARTICLE
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520 _ _ |a Observational studies suggest that higher birth weight (BW) is associated with increased risk of breast cancer in adult life. We conducted a two-sample Mendelian randomisation (MR) study to assess whether this association is causal. Sixty independent single nucleotide polymorphisms (SNPs) known to be associated at P < 5 × 10-8 with BW were used to construct (1) a 41-SNP instrumental variable (IV) for univariable MR after removing SNPs with pleiotropic associations with other breast cancer risk factors and (2) a 49-SNP IV for multivariable MR after filtering SNPs for data availability. BW predicted by the 41-SNP IV was not associated with overall breast cancer risk in inverse-variance weighted (IVW) univariable MR analysis of genetic association data from 122,977 breast cancer cases and 105,974 controls (odds ratio = 0.86 per 500 g higher BW; 95% confidence interval 0.73-1.01). Sensitivity analyses using four alternative methods and three alternative IVs, including an IV with 59 of the 60 BW-associated SNPs, yielded similar results. Multivariable MR adjusting for the effects of the 49-SNP IV on birth length, adult height, adult body mass index, age at menarche, and age at menopause using IVW and MR-Egger methods provided estimates consistent with univariable analyses. Results were also similar when all analyses were repeated after restricting to estrogen receptor-positive or -negative breast cancer cases. Point estimates of the odds ratios from most analyses performed indicated an inverse relationship between genetically-predicted BW and breast cancer, but we are unable to rule out an association between the non-genetically-determined component of BW and breast cancer. Thus, genetically-predicted higher BW was not associated with an increased risk of breast cancer in adult life in our MR study.
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700 1 _ |a Andrulis, Irene L
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700 1 _ |a Brenner, Hermann
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700 1 _ |a Burgess, Stephen
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700 1 _ |a Chang-Claude, Jenny
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700 1 _ |a Considine, Daniel
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700 1 _ |a Dörk, Thilo
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700 1 _ |a Evans, Dafydd Gareth R
|b 7
700 1 _ |a Gago-Domínguez, Manuela
|b 8
700 1 _ |a Giles, Graham G
|b 9
700 1 _ |a Hartman, Mikael
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700 1 _ |a Huo, Dezheng
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700 1 _ |a Kaaks, Rudolf
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700 1 _ |a Li, Jingmei
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700 1 _ |a Lophatananon, Artitaya
|b 14
700 1 _ |a Margolin, Sara
|b 15
700 1 _ |a Milne, Roger L
|b 16
700 1 _ |a Muir, Kenneth R
|b 17
700 1 _ |a Olsson, Håkan
|b 18
700 1 _ |a Punie, Kevin
|b 19
700 1 _ |a Radice, Paolo
|b 20
700 1 _ |a Simard, Jacques
|b 21
700 1 _ |a Tamimi, Rulla M
|b 22
700 1 _ |a Van Nieuwenhuysen, Els
|b 23
700 1 _ |a Wendt, Camilla
|b 24
700 1 _ |a Zheng, Wei
|b 25
700 1 _ |a Pharoah, Paul D P
|b 26
773 _ _ |a 10.1007/s10654-019-00485-7
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