Eleven cases of bronchogenic carcinoma、all workers from the Chongqing Asbestos Factory、 have been admitted to our hospital between 1963 and 1983.Seven cases were verified by histologi- cal exemination.Chrysotile is the main material used in this plant.The mean duration of time between first exposure to asbestos and occurrence of bronchogenic carcinoma was 19.2 years.The mean period of smoking for 10 male patients was 41.8 years except one female not smoking.The characteristic appearance of roentgenology was a prominent peripheral mass shadow.The histopa- thological patterns of 7 verified cases were:squamous cell carcinoma 2 cases

adenocarcinoma 2 ca- ses

and undifferentiated carcinoma 3 cases.Four patients had asbestosis complicated by bronchoge- nic carcinoma.The felationship of exposure to asbestos and smoking habit to the incidence of lung cancer

and their role in its pathogenesis

is discussed.Workers exposure to asbestos dust who are also smokers have an increased chance of developing lung cancer.It is strongly suggested that there should be stricter measures for dust control in the factory

and workers should be warned not to smoke.