The most representative genes in these four modules selected by us were regarded as Result A (Figure 3C, additionally shown in Supplementary ResultA.csv) and were subject to KEGG pathway enrichment, from which it was found that they were significantly enriched in cell cycle, ECM–receptor interaction, p53 signaling pathway, PI3K-Akt signaling pathway and small cell lung cancer with the nature as a pathway, which were all clearly associated with tumor function (Figure 3D). This evidence concerns the gene TP53 and small cell lung carcinoma.