Therefore, the purpose of this study is to investigate the correlation between the DCE-MRI histogram parameters and PTEN, P-Akt, and m-TOR of lung cancer, so as to provide a basis for non-invasive prediction of PI3K/Akt/mTOR pathway activation in lung cancer tissue by quantitative perfusion histogram parameters of DCE-MRI. The gene discussed is PTEN; the disease is lung carcinoma.