Lung cancer is a kind of malignant tumor located in the chest and a very common malignant tumor in the respiratory system. If lung cancer is not operated, it also depends on the subsequent treatment and the response to treatment to determine how long it can live, the specific analysis is as follows: 1. If lung adenocarcinoma is not operated, but the application of radiotherapy has effect, it is also possible to survive for more than 3 years, 5 years or even longer. Generally, lung adenocarcinoma also needs to consider the application of targeted drug therapy. There are more targeted drugs that can be applied for lung adenocarcinoma, such as ERSA, Troche, Kemena, etc. These are the drugs that can be chosen for lung adenocarcinoma patients with EGFR gene mutation. If these drugs do not work, there are some other drugs that can be chosen, such as crizotinib and other drugs. In addition, you can also consider the use of Anrotinib, which can be used directly without testing. If it is effective with targeted drugs, there is also long-term survival, but it is not easy to determine exactly how long you can live, you can only see it while treating. 2. For lung squamous carcinoma, there may not be many targeted drugs to choose, only Anrotinib can be considered, and the general survival time or treatment effect may not be as good as lung adenocarcinoma.