80 percent non-small cell lung cancer (NSCLC) 15 percent three main types 80 percent about 40 percent 80-85 percent 10-15 percent Lung Cancer Alliance different subtypes 15 percent 15 percent 80 percent 40 percent 15 percent according to the American Cancer Society 80-85 percent 80-85 percent of lung cancer American Cancer Society What Is Non-Small Cell Lung Cancer? American Cancer Society