More than two functional modules were involved in 19 pathways, such as the cytokine-cytokine receptor interaction signaling pathway, IL-17 signaling pathway, TNF signaling pathway, PPAR signaling pathway and PI3K/AKt signaling pathway (Figure 4B), which may constitute potential key pathways of early NSCLC. This evidence concerns the gene AKT1 and non-small cell lung carcinoma.