EZH2 and lung adenocarcinoma: In the interaction network diagram of 53 genes, 10 genes were at the core position (Degree ≥5; Figure 3B), among which KLF2 was obviously downregulated in lung adenocarcinoma tissues (Figure 3C), and there was a significant correlation between EZH2 and KLF2 in lung adenocarcinoma (Figure 3D).