Genome-wide association scan identifies a colorectal cancer susceptibility locus on 11q23 and replicates risk loci at 8q24 and 18q21.

Albert Tenesa, Susan M Farrington, James G D Prendergast, Mary E Porteous, Marion Walker, Naila Haq, Rebecca A Barnetson, Evropi Theodoratou, Roseanne Cetnarskyj, Nicola Cartwright, Colin Semple, Andrew J Clark, Fiona J L Reid, Lorna A Smith, Kostas Kavoussanakis, Thibaud Koessler, Paul D P Pharoah, Stephan Buch, Clemens Schafmayer, Jürgen Tepel, Stefan Schreiber, Henry Völzke, Carsten O Schmidt, Jochen Hampe, Jenny Chang-Claude, Michael Hoffmeister, Hermann Brenner, Stefan Wilkening, Federico Canzian, Gabriel Capella, Victor Moreno, Ian J Deary, John M Starr, Ian P M Tomlinson, Zoe Kemp, Kimberley Howarth, Luis Carvajal-Carmona, Emily Webb, Peter Broderick, Jayaram Vijayakrishnan, Richard S Houlston, Gad Rennert, Dennis Ballinger, Laura Rozek, Stephen B Gruber, Koichi Matsuda, Tomohide Kidokoro, Yusuke Nakamura, Brent W Zanke, Celia M T Greenwood, Jagadish Rangrej, Rafal Kustra, Alexandre Montpetit, Thomas J Hudson, Steven Gallinger, Harry Campbell, Malcolm G Dunlop
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Nature genetics
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In a genome-wide association study to identify loci associated with colorectal cancer (CRC) risk, we genotyped 555,510 SNPs in 1,012 early-onset Scottish CRC cases and 1,012 controls (phase 1). In phase 2, we genotyped the 15,008 highest-ranked SNPs in 2,057 Scottish cases and 2,111 controls. We then genotyped the five highest-ranked SNPs from the joint phase 1 and 2 analysis in 14,500 cases and 13,294 controls from seven populations, and identified a previously unreported association, rs3802842 on 11q23 (OR = 1.1; P = 5.8 x 10(-10)), showing population differences in risk. We also replicated and fine-mapped associations at 8q24 (rs7014346; OR = 1.19; P = 8.6 x 10(-26)) and 18q21 (rs4939827; OR = 1.2; P = 7.8 x 10(-28)). Risk was greater for rectal than for colon cancer for rs3802842 (P < 0.008) and rs4939827 (P < 0.009). Carrying all six possible risk alleles yielded OR = 2.6 (95% CI = 1.75-3.89) for CRC. These findings extend our understanding of the role of common genetic variation in CRC etiology.