Ovarian cancer is one of the most common gynaecological neoplasms, especially in industrialised countries. The aetiology of the disease is not well understood, except that inherited mutations in the breast cancer genes BRCA-1 and BRCA-2 account for up to 10% of all cases,1 and child-bearing, oral contraceptive use and breast-feeding reduce the risk.2 Some environmental exposures, notably talc and asbestos, have been suspected as ovarian carcinogens.
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Funding: This study was financed by the Cancer Registry of Norway.
Competing interests: None.
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