In a family with a remarkable aggregation of malignant mesothelioma the father, mother, and a son all died of the condition, whereas two other sons and a daughter were unaffected. From 1944 to 1961 the family produced a material that was used to fix screws in drilled holes and consisted of amosite, gypsum, and sand. It was produced in the basement of their villa and was described as being a dusty job. The father died in 1984 aged 74, the son in 1985 aged 45, and the mother in 1987 aged 79. It is concluded that there is a high risk ofmalignant mesothelioma after massive exposure to amosite and the risk and latency period are independent of age during the exposure. Malignant mesothelioma is rare in Denmark, constituting less than 0-3% of all cases of cancer. ' The association between exposure to asbestos and the development of malignant mesothelioma is well

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