Comment on

• Reduced risk of lung cancer with metformin therapy in diabetic patients: a systematic review and meta-analysis.

  Zhang ZJ, Bi Y, Li S, Zhang Q, Zhao G, Guo Y, Song Q. Zhang ZJ, et al. Am J Epidemiol. 2014 Jul 1;180(1):11-4. doi: 10.1093/aje/kwu124. Epub 2014 Jun 10. Am J Epidemiol. 2014. PMID: 24920786
• Re.: "Reduced risk of lung cancer with metformin therapy in diabetic patients: a systematic review and meta-analysis".

  Schmedt N, Azoulay L, Hense S. Schmedt N, et al. Am J Epidemiol. 2014 Dec 15;180(12):1216-7. doi: 10.1093/aje/kwu311. Epub 2014 Nov 12. Am J Epidemiol. 2014. PMID: 25395024 No abstract available.