In addition, we also analyzed the correlation coefficients between KDM1A and TIMP3 expressions in normal tissue and different tumor stages in lung adenocarcinoma in the TCGA database, and found that KDM1A expression is correlated with TIMP3 expression more significantly in T1 (r = −0.2423, P = 0.0015) and T2 stages (r = −0.2108, P = 0.0004) than in T3 and T4 stages. The gene discussed is TIMP3; the disease is lung adenocarcinoma.