Lung cancer is cancer in situ.

Lung cancer is a malignant tumor that occurs in the epithelium of the lung. It is divided into adenocarcinoma and squamous cell carcinoma of the lung and non-small cell lung cancer. We also call it small cell lung cancer and non-small cell lung cancer. Carcinoma in situ refers to malignant tumors that occur in the mucosa and submucosa, generally not breaking through the basement membrane. It refers to early cancer of lung cancer, which can be cured by surgery. The prognosis of patients with lung cancer in the middle and late stages is relatively poor, but after comprehensive treatment, the quality of life of patients can be improved and the survival time can be prolonged.