Figure 2From: Analysis of aberrant methylation on promoter sequences of tumor suppressor genes and total DNA in sputum samples: a promising tool for early detection of COPD and lung cancer in smokersRepresentative analysis DNA of concentration from sputum samples from CTR, COPD and LC subjects. DNA concentration in samples of induced sputum obtained from COPD, LC and CTR subjects. Columns show the median and range values for each data group. * P < 0.0001 respect to control group (CTR), ** p >0,05 respect to COPD group.Back to article page