Lung cancer is mainly divided into two categories: small-cell lung cancer and non-small-cell lung cancer, which can be subdivided into squamous carcinoma, adenocarcinoma and so on. 1. Small cell lung cancer, clinically mostly referred to as oat cell cancer, has small cell volume but large cell nucleus, with rapid development and poor prognosis, and it is very easy to be metastasized through blood. Once diagnosed, it is necessary to take timely treatment such as surgery, radiotherapy, targeting or immune therapy, etc., in order to control the disease. 2. Non-small cell lung cancer, including squamous carcinoma, adenocarcinoma and large cell carcinoma, etc., has a relatively slower development, and most of the patients can be cured by radical surgery, and if they cannot be operated, they can prolong their survival cycle through radiotherapy, chemotherapy, targeted or immune treatment.