It has not grown through the top lining of the lung. Another term for this type of lung cancer is carcinoma in situ. The cancer is only in the lung, and normal tissue is around it. Stage II Cancer has spread to nearby lymph nodes. Stage IV Cancer has spread to other parts of the body.
Chemotherapy uses drugs to kill cancer cells.
Chemotherapy may be taken by pill, or it may be put into the body by a needle in the vein or muscle. Chemotherapy is called a systemic treatment because the drug enters the bloodstream, travels through the body, and can kill cancer cells outside the lungs. Chemoprevention uses drugs to prevent a second cancer from occurring. One new type of radiation therapy is called radiosurgery. In radiosurgery, radiation is directly focused on the tumor, and involves as little normal tissue as possible.