However, no difference was found in prostate cancer risk between fathers with sons and fathers with daughters, as has been previously suggested.
For this latest study, the researchers analysed data from one million men born in Denmark between 1935 and 1988.
The men were followed up between 1968 and 2003, with 3,400 cases of prostate cancer identified from the Danish Cancer Registry.
Men without children were found to be 16 per cent less likely to develop prostate cancer compared with men with children, while fathers were found to have a 5 per cent reduction in prostate cancer risk for each additional child that was born.
No difference was found between prostate risk and child gender.
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