No association between DNA methylation and COPD in never and current smokers.
Maaike M De VriesDiana A van der PlaatJudith M VonkH Marike BoezenPublished in: BMJ open respiratory research (2018)
In contrast to a previous, smaller study, we did not observe any significant association between DNA methylation levels and the presence of COPD, independent of smoking status. Apparently, DNA methylation studies are highly variable.