A subsequent DNA CpG methylation profiling of the SFTPA1 gene promoter identified two CpG SFTPA1 sites (SFTPA1_370 and SFTPA1_1080, Figure 4C) to be hypomethylated in lung cancer (adenocarcinoma and squamous cell carcinoma). The gene discussed is SFTPA1; the disease is squamous cell carcinoma.