Further analyzing the correlation of these four genes for whether they had lymph node metastasis, whether they were positive for ki67, and the clinical stage of the patients according to the clinical baseline information of the patients, we found that high expression of the four genes was associated with the tumour progression of the patients with LUAD (Figures 2B–D). Here, MKI67 is linked to metastatic malignant neoplasm in the lymph nodes.