Aaron P Thrift1, Jian Gong1, Ulrike Peters1, Jenny Chang-Claude1, Anja Rudolph1, Martha L Slattery1, Andrew T Chan1, Tonu Esko1, Andrew R Wood1, Jian Yang1, Sailaja Vedantam1, Stefan Gustafsson1, Tune H Pers1, John A Baron1, Stéphane Bezieau1, Sébastien Küry1, Shuji Ogino1, Sonja I Berndt1, Graham Casey1, Robert W Haile1, Mengmeng Du1, Tabitha A Harrison1, Mark Thornquist1, David J Duggan1, Loic Le Marchand1, Mathieu Lemire1, Noralane M Lindor1, Daniela Seminara1, Mingyang Song1, Stephen N Thibodeau1, Michelle Cotterchio1, Aung Ko Win1, Mark A Jenkins1, John L Hopper1, Cornelia M Ulrich1, John D Potter1, Polly A Newcomb1, Robert E Schoen1, Michael Hoffmeister1, Hermann Brenner1, Emily White1, Li Hsu1, Peter T Campbell1. 1. Public Health Sciences Division, Fred Hutchinson Cancer Research Center, Seattle, WA, USA, Department of Medicine and Dan L. Duncan Cancer Center, Baylor College of Medicine, Houston, TX, USA, Department of Epidemiology, School of Public Health, University of Washington, Seattle, WA, USA, Division of Cancer Epidemiology, German Cancer Research Center (DKFZ), Heidelberg, Germany, Department of Internal Medicine, University of Utah Health Sciences Center, Salt Lake City, UT, USA, Division of Gastroenterology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA, Channing Division of Network Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA, Estonian Genome Center, University of Tartu, Tartu, Estonia, Divisions of Endocrinology and Genetics and Center for Basic Translational Obesity Research, Boston Children's Hospital, Boston, MA, USA, Department of Genetics, Harvard Medical School, Boston, MA, USA, Broad Institute, Cambridge, MA, USA, Genetics of Complex Traits, University of Exeter Medical School, Exeter, UK, Queensland Brain Institute, University of Queensland, Brisbane, QLD, Australia, University of Queensland Diamantina Institute, Translation Research Institute, Brisbane, QLD, Australia, Center for Biological Sequence Analysis, Department of Systems Biology, Technical University of Denmark, Lyngby, Denmark, Department of Medical Sciences, Uppsala University, Uppsala, Sweden, Department of Medicine, University of North Carolina School of Medicine, Chapel Hill, NC, USA, CHU Nantes, Service de Génétique Médicale, Nantes, France, Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA, Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA, USA, Department of Epidemiology, Harvard School of Public Health, Boston, MA, USA, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA, USC Norris
Abstract
BACKGROUND: For men and women, taller height is associated with increased risk of all cancers combined. For colorectal cancer (CRC), it is unclear whether the differential association of height by sex is real or is due to confounding or bias inherent in observational studies. We performed a Mendelian randomization study to examine the association between height and CRC risk. METHODS: To minimize confounding and bias, we derived a weighted genetic risk score predicting height (using 696 genetic variants associated with height) in 10,226 CRC cases and 10,286 controls. Logistic regression was used to estimate odds ratios (OR) and 95% confidence intervals (95% CI) for associations between height, genetically predicted height and CRC. RESULTS: Using conventional methods, increased height (per 10-cm increment) was associated with increased CRC risk (OR = 1.08, 95% CI = 1.02-1.15). In sex-specific analyses, height was associated with CRC risk for women (OR = 1.15, 95% CI = 1.05-1.26), but not men (OR = 0.98, 95% CI = 0.92-1.05). Consistent with these results, carrying greater numbers of (weighted) height-increasing alleles (per 1-unit increase) was associated with higher CRC risk for women and men combined (OR = 1.07, 95% CI = 1.01-1.14) and for women (OR = 1.09, 95% CI = .01-1.19). There was weaker evidence of an association for men (OR = 1.05, 95% CI = 0.96-1.15). CONCLUSION: We provide evidence for a causal association between height and CRC for women. The CRC-height association for men remains unclear and warrants further investigation in other large studies.
BACKGROUND: For men and women, taller height is associated with increased risk of all cancers combined. For colorectal cancer (CRC), it is unclear whether the differential association of height by sex is real or is due to confounding or bias inherent in observational studies. We performed a Mendelian randomization study to examine the association between height and CRC risk. METHODS: To minimize confounding and bias, we derived a weighted genetic risk score predicting height (using 696 genetic variants associated with height) in 10,226 CRC cases and 10,286 controls. Logistic regression was used to estimate odds ratios (OR) and 95% confidence intervals (95% CI) for associations between height, genetically predicted height and CRC. RESULTS: Using conventional methods, increased height (per 10-cm increment) was associated with increased CRC risk (OR = 1.08, 95% CI = 1.02-1.15). In sex-specific analyses, height was associated with CRC risk for women (OR = 1.15, 95% CI = 1.05-1.26), but not men (OR = 0.98, 95% CI = 0.92-1.05). Consistent with these results, carrying greater numbers of (weighted) height-increasing alleles (per 1-unit increase) was associated with higher CRC risk for women and men combined (OR = 1.07, 95% CI = 1.01-1.14) and for women (OR = 1.09, 95% CI = .01-1.19). There was weaker evidence of an association for men (OR = 1.05, 95% CI = 0.96-1.15). CONCLUSION: We provide evidence for a causal association between height and CRC for women. The CRC-height association for men remains unclear and warrants further investigation in other large studies.
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