The results indicated that there were 6 target genes with different expression in lung adenocarcinoma, namely, MET proto-oncogene (MET), glyceraldehyde-3-phosphate dehydrogenase (GAPDH), thymidine kinase 1 (TK1), arachidonate 5-lipoxygenase (ALOX5), arginase 1 (ARG1), and DNA topoisomerase II alpha (TOP2A) (Figure 4(a)). The gene discussed is TOP2A; the disease is lung adenocarcinoma.