Mendelian Randomization and mediation analysis of leukocyte telomere length and risk of lung and head and neck cancers.

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Kachuri, Linda, Saarela, Olli, Bojesen, Stig Egil, Davey Smith, George, Liu, Geoffrey, Landi, Maria Teresa, Caporaso, Neil E, Christiani, David C, Johansson, Mattias, Panico, Salvatore et al (show 60 more authors) , Overvad, Kim, Trichopoulou, Antonia, Vineis, Paolo, Scelo, Ghislaine, Zaridze, David, Wu, Xifeng, Albanes, Demetrius, Diergaarde, Brenda, Lagiou, Pagona, Macfarlane, Gary J, Aldrich, Melinda C, Tardón, Adonina, Rennert, Gad, Olshan, Andrew F, Weissler, Mark C, Chen, Chu, Goodman, Gary E, Doherty, Jennifer A, Ness, Andrew R, Bickeböller, Heike, Wichmann, H-Erich, Risch, Angela, Field, John K ORCID: 0000-0003-3951-6365, Teare, M Dawn, Kiemeney, Lambertus A, van der Heijden, Erik HFM, Carroll, June C, Haugen, Aage, Zienolddiny, Shanbeh, Skaug, Vidar, Wünsch-Filho, Victor, Tajara, Eloiza H, Ayoub Moysés, Raquel, Daumas Nunes, Fabio, Lam, Stephen, Eluf-Neto, Jose, Lacko, Martin, Peters, Wilbert HM, Le Marchand, Loïc, Duell, Eric J, Andrew, Angeline S, Franceschi, Silvia, Schabath, Matthew B, Manjer, Jonas, Arnold, Susanne, Lazarus, Philip, Mukeriya, Anush, Swiatkowska, Beata, Janout, Vladimir, Holcatova, Ivana, Stojsic, Jelena, Mates, Dana, Lissowska, Jolanta, Boccia, Stefania, Lesseur, Corina, Zong, Xuchen, McKay, James D, Brennan, Paul, Amos, Christopher I and Hung, Rayjean J (2018) Mendelian Randomization and mediation analysis of leukocyte telomere length and risk of lung and head and neck cancers. International journal of epidemiology, 48 (3). pp. 751-766.

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Abstract

Background:Evidence from observational studies of telomere length (TL) has been conflicting regarding its direction of association with cancer risk. We investigated the causal relevance of TL for lung and head and neck cancers using Mendelian Randomization (MR) and mediation analyses. Methods:We developed a novel genetic instrument for TL in chromosome 5p15.33, using variants identified through deep-sequencing, that were genotyped in 2051 cancer-free subjects. Next, we conducted an MR analysis of lung (16 396 cases, 13 013 controls) and head and neck cancer (4415 cases, 5013 controls) using eight genetic instruments for TL. Lastly, the 5p15.33 instrument and distinct 5p15.33 lung cancer risk loci were evaluated using two-sample mediation analysis, to quantify their direct and indirect, telomere-mediated, effects. Results:The multi-allelic 5p15.33 instrument explained 1.49-2.00% of TL variation in our data (p = 2.6 × 10-9). The MR analysis estimated that a 1000 base-pair increase in TL increases risk of lung cancer [odds ratio (OR) = 1.41, 95% confidence interval (CI): 1.20-1.65] and lung adenocarcinoma (OR = 1.92, 95% CI: 1.51-2.22), but not squamous lung carcinoma (OR = 1.04, 95% CI: 0.83-1.29) or head and neck cancers (OR = 0.90, 95% CI: 0.70-1.05). Mediation analysis of the 5p15.33 instrument indicated an absence of direct effects on lung cancer risk (OR = 1.00, 95% CI: 0.95-1.04). Analysis of distinct 5p15.33 susceptibility variants estimated that TL mediates up to 40% of the observed associations with lung cancer risk. Conclusions:Our findings support a causal role for long telomeres in lung cancer aetiology, particularly for adenocarcinoma, and demonstrate that telomere maintenance partially mediates the lung cancer susceptibility conferred by 5p15.33 loci.

Item Type:	Article
Uncontrolled Keywords:	lung cancer, telomere length, chromosome 5p15.33, Mendelian Randomization, mediation analysis, TERT
Depositing User:	Symplectic Admin
Date Deposited:	09 Oct 2018 10:29
Last Modified:	19 Jan 2023 01:15
DOI:	10.1093/ije/dyy140
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3027051