Figure 1.

Genome-wide mutation density from the TCGA datasets for lung adenocarcinoma and squamous cell carcinoma. Plot of mutations/megabase of the genome, with the X-axis representing the probability density. Current smokers were grouped with those reformed for less than 15 years, while those reformed greater than 15 years and lifelong non-smokers are presented separately. Since 96% of the squamous cell lung cancer group was identified as a smoker, this group was not further segregated.