Fine-scale mapping of the 4q24 locus identifies two independent loci associated with breast cancer risk.

Guo X, Long J, Zeng C, Michailidou K, Ghoussaini M, Bolla MK, Wang Q, Milne RL, Shu XO, Cai Q, Beesley J, Kar SP, Andrulis IL, Anton-Culver H, Arndt V, Beckmann MW, Beeghly-Fadiel A, Benitez J, Blot W, Bogdanova N, Bojesen SE, Brauch H, Brenner H, Brinton L, Broeks A, Brüning T, Burwinkel B, Cai H, Canisius S, Chang-Claude J, Choi JY, Couch FJ, Cox A, Cross SS, Czene K, Darabi H, Devilee P, Droit A, Dörk T, Fasching PA, Fletcher O, Flyger H, Fostira F, Gaborieau V, García-Closas M, Giles GG, Grip M, Guénel P, Haiman CA, Hamann U, Hartman M, Hollestelle A, Hopper JL, Hsiung CN, Ito H, Jakubowska A, Johnson N, Kabisch M, Kang D, Khan S, Knight JA, Kosma VM, Lambrechts D, Le Marchand L, Li J, Lindblom A, Lophatananon A, Lubinski J, Mannermaa A, Manoukian S, Margolin S, Marme F, Matsuo K, McLean CA, Meindl A, Muir K, Neuhausen SL, Nevanlinna H, Nord S, Olson JE, Orr N, Peterlongo P, Putti TC, Rudolph A, Sangrajrang S, Sawyer EJ, Schmidt MK, Schmutzler RK, Shen CY, Shi J, Shrubsole MJ, Southey MC, Swerdlow A, Teo SH, Thienpont B, Toland AE, Tollenaar RA, Tomlinson IP, Truong T, Tseng CC, van den Ouweland A, Wen W, Winqvist R, Wu A, Yip CH, Zamora MP, Zheng Y, Hall P, Pharoah PD, Simard J, Chenevix-Trench G, kConFab Investigators, Dunning AM, Easton DF, Zheng W
Cancer Epidemiol Biomarkers Prev 24 1680-91 11/01/2015


BACKGROUND: A recent association study identified a common variant (rs9790517) at 4q24 to be associated with breast cancer risk. Independent association signals and potential functional variants in this locus have not been explored.

METHODS: We conducted a fine-mapping analysis in 55,540 breast cancer cases and 51,168 controls from the Breast Cancer Association Consortium.

RESULTS: Conditional analyses identified two independent association signals among women of European ancestry, represented by rs9790517 [conditional P = 2.51 × 10(-4); OR, 1.04; 95% confidence interval (CI), 1.02-1.07] and rs77928427 (P = 1.86 × 10(-4); OR, 1.04; 95% CI, 1.02-1.07). Functional annotation using data from the Encyclopedia of DNA Elements (ENCODE) project revealed two putative functional variants, rs62331150 and rs73838678 in linkage disequilibrium (LD) with rs9790517 (r(2) ≥ 0.90) residing in the active promoter or enhancer, respectively, of the nearest gene, TET2. Both variants are located in DNase I hypersensitivity and transcription factor-binding sites. Using data from both The Cancer Genome Atlas (TCGA) and Molecular Taxonomy of Breast Cancer International Consortium (METABRIC), we showed that rs62331150 was associated with level of expression of TET2 in breast normal and tumor tissue.

CONCLUSION: Our study identified two independent association signals at 4q24 in relation to breast cancer risk and suggested that observed association in this locus may be mediated through the regulation of TET2.

IMPACT: Fine-mapping study with large sample size warranted for identification of independent loci for breast cancer risk.

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