A novel colorectal cancer risk locus at 4q32.2 identified from an international genome-wide association study.

Carcinogenesis

USC Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, CA 90089, USA, Vanderbilt Epidemiology Center, Vanderbilt University, Nashville, TN 37232, USA, Department of Community Medicine and Epidemiology, Carmel Medical Center, Haifa, Israel, Clalit Health Services, National Cancer Control Center, Haifa, Israel, Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, The University of Melbourne, Parkville, Victoria, Australia, Oncogenomics Group, Genetic Epidemiology Laboratory, Department of Pathology, University of Melbourne, Victoria, Australia, Department of Health Science Research, Mayo Clinic Arizona, Scottsdale, 8525 AZ, USA, Epidemiology Program, University of Hawaii Cancer Center, Honolulu, HI 96813, USA, Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada, Department of Medicine, Division of Oncology, Stanford University, Stanford, CA 94305, USA, Cancer Prevention Program, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA and Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel

Published: November 2014

A study aimed to uncover new risk factors for colorectal cancer by analyzing genetic variations in European populations, revealing that a small part of heritability is linked to known risk genes.* -
A genome-wide association study (GWAS) meta-analysis combined data from cases and controls in Israel and the Colon Cancer Family Registry, leading to the identification of a significant new risk locus on chromosome 4q32.2.* -
This new susceptibility locus, linked to the FSTL5 gene, shows a high odds ratio of 1.53 and has been consistently associated with colorectal cancer risk, reinforcing previous findings of 14 known risk variants.*

Only a fraction of colorectal cancer heritability is explained by known risk-conferring genetic variation. This study was designed to identify novel risk alleles in Europeans. We conducted a genome-wide association study (GWAS) meta-analysis of colorectal cancer in participants from a population-based case-control study in Israel (n = 1616 cases, 1329 controls) and a consortium study from the Colon Cancer Family Registry (n = 1977 cases, 999 controls). We used a two-stage (discovery-replication) GWAS design, followed by a joint meta-analysis. A combined analysis identified a novel susceptibility locus that reached genome-wide significance on chromosome 4q32.2 [rs35509282, risk allele = A (minor allele frequency = 0.09); odds ratio (OR) per risk allele = 1.53; P value = 8.2 × 10(-9); nearest gene = FSTL5]. The direction of the association was consistent across studies. In addition, we confirmed that 14 of 29 previously identified susceptibility variants were significantly associated with risk of colorectal cancer in this study. Genetic variation on chromosome 4q32.2 is significantly associated with risk of colorectal cancer in Ashkenazi Jews and Europeans in this study.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4271131	PMC
http://dx.doi.org/10.1093/carcin/bgu148	DOI Listing

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