Association of transforming growth factor-β gene polymorphisms and chronic obstructive pulmonary disease risk.

• Transforming growth factor-β relates to chronic obstructive pulmonary disease. • Comment on some debatable points shown. • Test Hardy–Weinberg equilibrium for this meta -analysis. Recently, He et al. performed a meta -analysis to interpret the association between transforming growth factor-β (TGF-β) gene polymorphisms and chronic obstructive pulmonary disease (COPD) risk. However, we would like to comment on some debatable points shown in this meta -analysis. [ABSTRACT FROM AUTHOR]