A case-referent study of cancer mortality among sulfate mill workers in Sweden

Objectives-To investigate whether workers in Swedish sulfate mills have an increased risk of death from certain malignancies that have previously been linked to the pulping process. Methods-Subjects of the study (n=2480) were men aged 40-75 at death during 1960-89 in the parishes surrounding four sulfate mills. Exposure assessment was based on information from the personnel files in the mills-35% of the subjects were recognised there, and work categories were created. Results-Among all sulfate mill workers, the odds ratio (OR) (90% confidence interval (90% CI)) for death from lung cancer was 1.6 (1.1 to 2.3), pleura l mesotheliomas 9.5 (1.9 to 48), brain tumours 2.6 (1.2 to 5.3), and liver or biliary tract cancer 2.3 (1.0 to 5.2), There was an increased mortality from leukaemia among workers in the soda recovery plant (5.9 (2.6 to 13)) a nd bleaching plant and digester house (2.8 (1.0 to 7.5)), Conclusions-Sulfate mill workers were at increased risk of dying from lung cancer and pleural mesotheliomas, probably due to exposure to asbestos, Inc reased risks of brain tumours and cancers of the liver or biliary tract wer e also found but the aetiology is not obvious.