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Tobacco Smoking and Gastric Cancer: Meta-Analyses of Published Data Versus Pooled Analyses of Individual Participant Data (Stop Project) Publisher Pubmed



Ferro A1 ; Morais S1 ; Rota M3 ; Pelucchi C4 ; Bertuccio P4 ; Bonzi R4 ; Galeone C7 ; Zhang ZF8 ; Matsuo K13 ; Ito H13 ; Hu J14 ; Johnson KC16 ; Yuo GP15 ; Palli D5 Show All Authors
Authors
  1. Ferro A1
  2. Morais S1
  3. Rota M3
  4. Pelucchi C4
  5. Bertuccio P4
  6. Bonzi R4
  7. Galeone C7
  8. Zhang ZF8
  9. Matsuo K13
  10. Ito H13
  11. Hu J14
  12. Johnson KC16
  13. Yuo GP15
  14. Palli D5
  15. Ferraroni M4
  16. Muscat J9
  17. Malekzadeh R18
  18. Ye W20
  19. Song H20
  20. Zaridze D22
  21. Maximovitch D23, 24, 25
  22. Aragones N24, 26, 27, 28
  23. Castanovinyals G29
  24. Vioque J29
  25. Navarretemunoz EM17, 18, 30
  26. Pakseresht M1, 18, 19
  27. Pourfarzi F21
  28. Wolk A21
  29. Orsini N21
  30. Bellavia A21
  31. Hakansson N11
  32. Mu L6
  33. Pastorino R10
  34. Kurtz RC18, 31
  35. Derakhshan MH32
  36. Lagiou A12, 33
  37. Lagioul P9
  38. Boffetta P9
  39. Boccia S6, 7
  40. Negri E3
  41. Vecchia CL4
  42. Peleteiro B1, 2
  43. Lunet N1, 2

Source: European Journal of Cancer Prevention Published:2018


Abstract

Tobacco smoking is one of the main risk factors for gastric cancer, but the magnitude of the association estimated by conventional systematic reviews and meta-Analyses might be inaccurate, due to heterogeneous reporting of data and publication bias. We aimed to quantify the combined impact of publication-related biases, and heterogeneity in data analysis or presentation, in the summary estimates obtained from conventional meta-Analyses. We compared results from individual participant data pooled-Analyses, including the studies in the Stomach Cancer Pooling (StoP) Project, with conventional meta-Analyses carried out using only data available in previously published reports from the same studies. Fromthe 23 studies in the StoP Project, 20 had published reports with information on smoking and gastric cancer, but only six had specific data for gastric cardia cancer and seven had data on the daily number of cigarettes smoked. Compared to the results obtained with the StoP database, conventional meta-Analyses overvalued the relation between ever smoking (summary odds ratios ranging from 7% higher for all studies to 22% higher for the risk of gastric cardia cancer) and yielded less precise summary estimates (SE ≤2.4 times higher). Additionally, funnel plot asymmetry and corresponding hypotheses tests were suggestive of publication bias. Conventional meta-Analyses and individual participant data pooled-Analyses reached similar conclusions on the direction of the association between smoking and gastric cancer. However, published data tended to overestimate the magnitude of the effects, possibly due to publication biases and limited the analyses by different levels of exposure or cancer subtypes. European Journal of Cancer Prevention 27:197-204 Copyright © 2018 Wolters Kluwer Health, Inc. All rights reserved.
Other Related Docs
4. The Stomach Cancer Pooling (Stop) Project: Study Design and Presentation, European Journal of Cancer Prevention (2015)