Treatment can include chemotherapy, radiotherapy and surgery. Lung cancer that originates in the cells of the lungs is called primary lung cancer, but cancer can also spread to the lungs to other parts of the body. Metastatic cancers spread to the lungs most commonly from the breast, colon, prostate, kidney, thyroid, stomach, cervix, rectum, testicles, bones and skin (melanoma). Over 90% of primary lung cancers start in the bronchi and lung cancer is called lung cancer. Specific types of lung cancer are small cell carcinoma, squamous cell carcinoma, large cell carcinoma and adenocarcinoma.The last three types of lung cancer is often referred to as non-small cell lung cancer. Alveolar cell carcinoma originates in the small air sacs of the lung (alveoli). Although the alveolar cell carcinoma can occur in one place, often taking place simultaneously in more than one area of the lung. Less common are the bronchial carcinoid lung tumors (which can be cancerous or noncancerous), hamartoma chondromatous and sarcoma. Lymphoma is a cancer of the lymphatic system, may begin in the lungs and spread to them.