[High risk factors of lung cancer and its early detection]

High risk factors and early detection of lung cancer were studied in a population of greater than 45 years old of 10 122 in Lu Wen District. It was shown as follows: 1. The high risk factors of lung cancer were male greater than 50 years old, and with a smoking history of greater than 400 pack year. 2. Questionnaire 70-110 mm X-ray chest film and sputum cytological examination for the suspicious lung cancer were the screen test for the high risk group. Their prevalence rate of lung cancer was 4.74/1000, 50% of them was in p-staging I, it was 6.3 times higher, than in the specialized hospital, their 5-yr survival rate was 31.5%. It was higher than that in the general population.