Mendelian randomisation implicates hyperlipidaemia as a risk factor for colorectal cancer

Henry Rodriguez-Broadbent, Philip J. Law, Amit Sud, Kimmo Palin, Sari Tuupanen, Alexandra Gylfe, Ulrika A. Hänninen, Tatiana Cajuso, Tomas Tanskanen, Johanna Kondelin, Eevi Kaasinen, Antti Pekka Sarin, Samuli Ripatti, Johan G. Eriksson, Harri Rissanen, Paul Knekt, Eero Pukkala, Pekka Jousilahti, Veikko Salomaa, Aarno PalotieLaura Renkonen-Sinisalo, Anna Lepistö, Jan Böhm, Jukka Pekka Mecklin, Nada A. Al-Tassan, Claire Palles, Lynn Martin, Ella Barclay, Susan M. Farrington, Maria N. Timofeeva, Brian F. Meyer, Salma M. Wakil, Harry Campbell, Christopher G. Smith, Shelley Idziaszczyk, Timothy S. Maughan, Richard Kaplan, Rachel Kerr, David Kerr, Michael N. Passarelli, Jane C. Figueiredo, Daniel D. Buchanan, Aung K. Win, John L. Hopper, Mark A. Jenkins, Noralane M. Lindor, Polly A. Newcomb, Steven Gallinger, David Conti, Fred Schumacher, Graham Casey, Lauri A. Aaltonen, Jeremy P. Cheadle, Ian P. Tomlinson, Malcolm G. Dunlop, Richard S. Houlston

Research output: Contribution to journalArticle

22 Scopus citations

Abstract

While elevated blood cholesterol has been associated with an increased risk of colorectal cancer (CRC) in observational studies, causality is uncertain. Here we apply a Mendelian randomisation (MR) analysis to examine the potential causal relationship between lipid traits and CRC risk. We used single nucleotide polymorphisms (SNPs) associated with blood levels of total cholesterol (TC), triglyceride (TG), low-density lipoprotein (LDL), and high-density lipoprotein (HDL) as instrumental variables (IV). We calculated MR estimates for each risk factor with CRC using SNP-CRC associations from 9,254 cases and 18,386 controls. Genetically predicted higher TC was associated with an elevated risk of CRC (odds ratios (OR) per unit SD increase = 1.46, 95% confidence interval [CI]: 1.20–1.79, p = 1.68 × 10−4). The pooled ORs for LDL, HDL, and TG were 1.05 (95% CI: 0.92–1.18, p = 0.49), 0.94 (95% CI: 0.84–1.05, p = 0.27), and 0.98 (95% CI: 0.85–1.12, p = 0.75) respectively. A genetic risk score for 3-hydoxy-3-methylglutaryl-coenzyme A reductase (HMGCR) to mimic the effects of statin therapy was associated with a reduced CRC risk (OR = 0.69, 95% CI: 0.49–0.99, p = 0.046). This study supports a causal relationship between higher levels of TC with CRC risk, and a further rationale for implementing public health strategies to reduce the prevalence of hyperlipidaemia.

Original languageEnglish (US)
Pages (from-to)2701-2708
Number of pages8
JournalInternational Journal of Cancer
Volume140
Issue number12
DOIs
StatePublished - Jun 15 2017

Keywords

  • Mendelian randomisation
  • cholesterol
  • colorectal cancer
  • hyperlipidaemia
  • risk

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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    Rodriguez-Broadbent, H., Law, P. J., Sud, A., Palin, K., Tuupanen, S., Gylfe, A., Hänninen, U. A., Cajuso, T., Tanskanen, T., Kondelin, J., Kaasinen, E., Sarin, A. P., Ripatti, S., Eriksson, J. G., Rissanen, H., Knekt, P., Pukkala, E., Jousilahti, P., Salomaa, V., ... Houlston, R. S. (2017). Mendelian randomisation implicates hyperlipidaemia as a risk factor for colorectal cancer. International Journal of Cancer, 140(12), 2701-2708. https://doi.org/10.1002/ijc.30709