How long can lung cancer live without treatment in its early stage and with conservative treatment depends mainly on the cytological classification of lung cancer. If it is squamous carcinoma, the survival period is usually around one year without treatment. If it is adenocarcinoma, the survival is also in about one year without treatment. The survival period for small cell lung cancer will be significantly shorter, at three months and six months. Therefore, early stage lung cancer should be treated with surgical resection, along with chemotherapy and radiotherapy as necessary. In case of adenocarcinoma in women, gene targeting test needs to be given in order to give gene targeting drug treatment as early as possible, which can prolong the survival of patients significantly, instead of just giving up the treatment. It is very important whether lung cancer can be treated in early stage. Once no metastasis occurs, it is recommended to give surgery to remove the primary lesion as soon as possible. If it is accompanied by distant metastasis at an advanced stage, a combination of Chinese and Western medicine can also be used according to the patient’s specific condition to prolong the patient’s survival as much as possible.