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. 2021 Oct;125(8):1135-1145.
doi: 10.1038/s41416-021-01432-8. Epub 2021 Aug 2.

Mendelian randomisation study of smoking exposure in relation to breast cancer risk

Hanla A Park  1   2 Sonja Neumeyer  1 Kyriaki Michailidou  3   4   5 Manjeet K Bolla  5 Qin Wang  5 Joe Dennis  5 Thomas U Ahearn  6 Irene L Andrulis  7   8 Hoda Anton-Culver  9 Natalia N Antonenkova  10 Volker Arndt  11 Kristan J Aronson  12 Annelie Augustinsson  13 Adinda Baten  14 Laura E Beane Freeman  6 Heiko Becher  15   16 Matthias W Beckmann  17 Sabine Behrens  1 Javier Benitez  18   19 Marina Bermisheva  20 Natalia V Bogdanova  10   21   22 Stig E Bojesen  23   24   25 Hiltrud Brauch  26   27   28 Hermann Brenner  11   29   30 Sara Y Brucker  31 Barbara Burwinkel  32   33 Daniele Campa  1   34 Federico Canzian  35 Jose E Castelao  36 Stephen J Chanock  6 Georgia Chenevix-Trench  37 Christine L Clarke  38 NBCS CollaboratorsDon M Conroy  39 Fergus J Couch  40 Angela Cox  41 Simon S Cross  41   42 Kamila Czene  43 Mary B Daly  44 Peter Devilee  45   46 Thilo Dörk  22 Isabel Dos-Santos-Silva  47 Miriam Dwek  48 Diana M Eccles  49 A Heather Eliassen  50   51 Christoph Engel  52 Mikael Eriksson  43 D Gareth Evans  53   54 Peter A Fasching  17   55 Henrik Flyger  56 Lin Fritschi  57 Montserrat García-Closas  6 José A García-Sáenz  58 Mia M Gaudet  59 Graham G Giles  60   61   62 Gord Glendon  7 Mark S Goldberg  63   64 David E Goldgar  65 Anna González-Neira  19 Mervi Grip  66 Pascal Guénel  67 Eric Hahnen  68   69 Christopher A Haiman  70 Niclas Håkansson  71 Per Hall  43   72 Ute Hamann  73 Sileny Han  14 Elaine F Harkness  74   75   76 Steven N Hart  77 Wei He  43 Bernadette A M Heemskerk-Gerritsen  78 John L Hopper  61 David J Hunter  51   79   80 ABCTB InvestigatorskConFab InvestigatorsAgnes Jager  78 Anna Jakubowska  81   82 Esther M John  83   84 Audrey Jung  1 Rudolf Kaaks  1 Pooja Middha Kapoor  1   2 Renske Keeman  85 Elza Khusnutdinova  20   86 Cari M Kitahara  87 Linetta B Koppert  88 Stella Koutros  6 Vessela N Kristensen  89 Allison W Kurian  83   84 James Lacey  90   91 Diether Lambrechts  92   93 Loic Le Marchand  94 Wing-Yee Lo  26   95 Jan Lubiński  81 Arto Mannermaa  96   97   98 Mehdi Manoochehri  73 Sara Margolin  72   99 Maria Elena Martinez  100   101 Dimitrios Mavroudis  102 Alfons Meindl  103 Usha Menon  104 Roger L Milne  60   61   62 Taru A Muranen  105 Heli Nevanlinna  105 William G Newman  53   54 Børge G Nordestgaard  23   24   25 Kenneth Offit  106   107 Andrew F Olshan  108 Håkan Olsson  13 Tjoung-Won Park-Simon  22 Paolo Peterlongo  109 Julian Peto  47 Dijana Plaseska-Karanfilska  110 Nadege Presneau  48 Paolo Radice  111 Gad Rennert  112 Hedy S Rennert  112 Atocha Romero  113 Emmanouil Saloustros  114 Elinor J Sawyer  115 Marjanka K Schmidt  85   116 Rita K Schmutzler  68   69   117 Minouk J Schoemaker  118 Lukas Schwentner  119 Christopher Scott  77 Mitul Shah  39 Xiao-Ou Shu  120 Jacques Simard  121 Ann Smeets  122 Melissa C Southey  60   62   123 John J Spinelli  124   125 Victoria Stevens  59 Anthony J Swerdlow  118   126 Rulla M Tamimi  50   51   79 William J Tapper  49 Jack A Taylor  127   128 Mary Beth Terry  129 Ian Tomlinson  130   131 Melissa A Troester  108 Thérèse Truong  67 Celine M Vachon  132 Elke M van Veen  53   54 Joseph Vijai  106   107 Sophia Wang  90   91 Camilla Wendt  99 Robert Winqvist  133   134 Alicja Wolk  71   135 Argyrios Ziogas  9 Alison M Dunning  39 Paul D P Pharoah  5   39 Douglas F Easton  5   39 Wei Zheng  120 Peter Kraft  51   79 Jenny Chang-Claude  136   137
Collaborators, Affiliations

Mendelian randomisation study of smoking exposure in relation to breast cancer risk

Hanla A Park et al. Br J Cancer. 2021 Oct.

Abstract

Background: Despite a modest association between tobacco smoking and breast cancer risk reported by recent epidemiological studies, it is still equivocal whether smoking is causally related to breast cancer risk.

Methods: We applied Mendelian randomisation (MR) to evaluate a potential causal effect of cigarette smoking on breast cancer risk. Both individual-level data as well as summary statistics for 164 single-nucleotide polymorphisms (SNPs) reported in genome-wide association studies of lifetime smoking index (LSI) or cigarette per day (CPD) were used to obtain MR effect estimates. Data from 108,420 invasive breast cancer cases and 87,681 controls were used for the LSI analysis and for the CPD analysis conducted among ever-smokers from 26,147 cancer cases and 26,072 controls. Sensitivity analyses were conducted to address pleiotropy.

Results: Genetically predicted LSI was associated with increased breast cancer risk (OR 1.18 per SD, 95% CI: 1.07-1.30, P = 0.11 × 10-2), but there was no evidence of association for genetically predicted CPD (OR 1.02, 95% CI: 0.78-1.19, P = 0.85). The sensitivity analyses yielded similar results and showed no strong evidence of pleiotropic effect.

Conclusion: Our MR study provides supportive evidence for a potential causal association with breast cancer risk for lifetime smoking exposure but not cigarettes per day among smokers.

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Conflict of interest statement

U.Me. has reported a conflict of interest outside of the submitted work (owing stocks in Abcodia awarded to her by University College London). P.H., R.M.T. and A.Cox. are subject editors for the British Journal of Cancer. P.D.P. P., E.J.S. and K.Cz. are editorial board members for the British Journal of Cancer. The remaining authors declare no competing interests.

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