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. Author manuscript; available in PMC: 2012 Jul 1.
Published in final edited form as: Clin Cancer Res. 2011 May 24;17(13):4494–4503. doi: 10.1158/1078-0432.CCR-10-3436

Figure 2. Promoter methylation levels for the six markers in serum DNA from lung cancer patients (CA) and age-matched control subjects (N).

Figure 2

The quantity of methylated alleles of each gene was expressed as the ratio of the amount of polymerase chain reaction products amplified from the methylated gene to the amount amplified from the reference gene β-actin multiplied by 1000. Box plots show the middle 50% of the data, the line is the median, and the bars extend the median by 1.5 times the interquartile range.