With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Lung cancer occurs in zero people.
text_B: Lung cancer , also known as lung carcinoma , is a malignant lung tumor characterized by uncontrolled cell growth in tissues of the lung .. lung tumor. lung tumor. cell growth. cell growth. tissues. tissue ( biology ). lung. lung. cancer. cancer. This growth can spread beyond the lung by the process of metastasis into nearby tissue or other parts of the body .. lung. lung. metastasis. metastasis. Most cancers that start in the lung , known as primary lung cancers , are carcinomas .. lung. lung. carcinomas. carcinomas. The two main types are small-cell lung carcinoma -LRB- SCLC -RRB- and non-small-cell lung carcinoma -LRB- NSCLC -RRB- .. non-small-cell lung carcinoma. non-small-cell lung carcinoma. lung. lung. small-cell lung carcinoma. small-cell lung carcinoma. The most common symptoms are coughing -LRB- including coughing up blood -RRB- , weight loss , shortness of breath , and chest pains .. coughing up blood. Hemoptysis. The vast majority -LRB- 85 % -RRB- of cases of lung cancer are due to long-term tobacco smoking .. lung. lung. cancer. cancer. tobacco smoking. tobacco smoking. About 10 -- 15 % of cases occur in people who have never smoked .. These cases are often caused by a combination of genetic factors and exposure to radon gas , asbestos , second-hand smoke , or other forms of air pollution .. genetic factors. genetics. radon. radon. asbestos. asbestos. air pollution. air pollution. second-hand smoke. passive smoking. Lung cancer may be seen on chest radiographs and computed tomography -LRB- CT -RRB- scans .. cancer. cancer. computed tomography. computed tomography. The diagnosis is confirmed by biopsy which is usually performed by bronchoscopy or CT-guidance .. diagnosis. medical diagnosis. biopsy. biopsy. bronchoscopy. bronchoscopy. Avoidance of risk factors , including smoking and air pollution , is the primary method of prevention .. air pollution. air pollution. Treatment and long-term outcomes depend on the type of cancer , the stage -LRB- degree of spread -RRB- , and the person 's overall health .. cancer. cancer. stage. staging ( pathology ). Most cases are not curable .. Common treatments include surgery , chemotherapy , and radiotherapy .. chemotherapy. chemotherapy. radiotherapy. radiation therapy. surgery. surgery. NSCLC is sometimes treated with surgery , whereas SCLC usually responds better to chemotherapy and radiotherapy .. chemotherapy. chemotherapy. radiotherapy. radiation therapy. surgery. surgery. Worldwide in 2012 , lung cancer occurred in 1.8 million people and resulted in 1.6 million deaths .. lung. lung. cancer. cancer. This makes it the most common cause of cancer-related death in men and second most common in women after breast cancer .. cancer. cancer. breast cancer. breast cancer. The most common age at diagnosis is 70 years .. diagnosis. medical diagnosis. Overall , 17.4 % of people in the United States diagnosed with lung cancer survive five years after the diagnosis , while outcomes on average are worse in the developing world .. lung. lung. cancer. cancer. diagnosis. medical diagnosis. survive five years. Five-year survival rate
related.