Once a stage is assigned and treatment given the stage is never changed. I, with recurrence to the lung. Cancers are treated by several methods. Surgery to remove the cancer will be curative only if the cancer is in one place and that place can be removed safely with an adequate margin of normal tissue and if the potential for spread elsewhere is low. Radiation is given to treat an entire area.
Chemotherapy is used if the entire body is at risk.
Often treatments are combined. Treatment is determined by the type of cancer, the grade, stage, location and the biological behavior expected of that particular cancer. Age and overall physical health also need to be considered. The goal of treatment may not necessarily be for cure but for palliation. If the cancer is essentially incurable but is causing problems that can be remedied then treatment for relief of symptoms is indicated.