Boxplot analyses for all specimens did not demonstrate significant differences between either lung adenocarcinomas or squamous cell carcinomas and normal tissues (Figures 4(a) and 4(b)); however, statistically increased Id1 expression was nearly achieved for squamous cell carcinomas versus adenocarcinomas (Figure 4(c)) (P = .0579) (Tables 1 and 2). This evidence concerns the gene ID1 and squamous cell carcinoma.