A new study from Danish researchers has found that childless men have a lower risk of developing prostate cancer than fathers, and that, paradoxically, the more children a father has, the lower the risk of the disease.
Whether fatherhood can affect the risk of prostate cancer remains controversial. Evidence has suggested that childless men may be at lower risk of prostate cancer than men with children, and that men who father sons may be at lower risk than men with daughters only.
Researchers used a national population-based register to analyze data from all men born in Denmark between 1935 and 1988, among which 3,400 developed prostate cancer. They found men without children were 16 percent less likely than those with children to be diagnosed with prostate cancer during up to 35-years of follow up. The analysis also revealed that among fathers, there was a gradually reduced prostate cancer risk with increasing number of children. The authors suggest that, theoretically, this might reflect a “healthy father” phenomenon, in which men who retain fertility are less likely to develop a malignancy. The study found no association between prostate risk and child gender.
The analysis did not reveal what factors associated with childlessness might be responsible for the risk reduction. Currently known risk factors for prostate cancer are race, family history of prostate cancer, and advanced age.