EBioMedicine (Nov 2015)

Associated Links Among Smoking, Chronic Obstructive Pulmonary Disease, and Small Cell Lung Cancer: A Pooled Analysis in the International Lung Cancer Consortium

  • Ruyi Huang,
  • Yongyue Wei,
  • Rayjean J. Hung,
  • Geoffrey Liu,
  • Li Su,
  • Ruyang Zhang,
  • Xuchen Zong,
  • Zuo-Feng Zhang,
  • Hal Morgenstern,
  • Irene Brüske,
  • Joachim Heinrich,
  • Yun-Chul Hong,
  • Jin Hee Kim,
  • Michele Cote,
  • Angela Wenzlaff,
  • Ann G. Schwartz,
  • Isabelle Stucker,
  • John Mclaughlin,
  • Michael W. Marcus,
  • Michael P.A. Davies,
  • Triantafillos Liloglou,
  • John K. Field,
  • Keitaro Matsuo,
  • Matt Barnett,
  • Mark Thornquist,
  • Gary Goodman,
  • Yi Wang,
  • Size Chen,
  • Ping Yang,
  • Eric J. Duell,
  • Angeline S. Andrew,
  • Philip Lazarus,
  • Joshua Muscat,
  • Penella Woll,
  • Janet Horsman,
  • M. Dawn Teare,
  • Anath Flugelman,
  • Gad Rennert,
  • Yan Zhang,
  • Hermann Brenner,
  • Christa Stegmaier,
  • Erik H.F.M. van der Heijden,
  • Katja Aben,
  • Lambertus Kiemeney,
  • Juan Barros-Dios,
  • Monica Pérez-Ríos,
  • Alberto Ruano-Ravina,
  • Neil E. Caporaso,
  • Pier Alberto Bertazzi,
  • Maria Teresa Landi,
  • Juncheng Dai,
  • Hongbing Shen,
  • Guillermo Fernandez-Tardon,
  • Marta Rodriguez-Suarez,
  • Adonina Tardon,
  • David C. Christiani

DOI
https://doi.org/10.1016/j.ebiom.2015.09.031
Journal volume & issue
Vol. 2, no. 11
pp. 1677 – 1685

Abstract

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Background: The high relapse and mortality rate of small-cell lung cancer (SCLC) fuels the need for epidemiologic study to aid in its prevention. Methods: We included 24 studies from the ILCCO collaboration. Random-effects panel logistic regression and cubic spline regression were used to estimate the effects of smoking behaviors on SCLC risk and explore their non-linearity. Further, we explored whether the risk of smoking on SCLC was mediated through COPD. Findings: Significant dose–response relationships of SCLC risk were observed for all quantitative smoking variables. Smoking pack-years were associated with a sharper increase of SCLC risk for pack-years ranged 0 to approximately 50. The former smokers with longer cessation showed a 43%quit_for_5–9 years to 89%quit_for_≥20 years declined SCLC risk vs. subjects who had quit smoking <5 years. Compared with non-COPD subjects, smoking behaviors showed a significantly higher effect on SCLC risk among COPD subjects, and further, COPD patients showed a 1.86-fold higher risk of SCLC. Furthermore, smoking behaviors on SCLC risk were significantly mediated through COPD which accounted for 0.70% to 7.55% of total effects. Interpretation: This is the largest pooling study that provides improved understanding of smoking on SCLC, and further demonstrates a causal pathway through COPD that warrants further experimental study.

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