Sperm Counts, Testicular Cancer and the Environment

October 2017

A recent meta-analysis by Levine and colleagues showing significant declines in sperm counts among men in the Western world caught considerable media attention. The Levine study followed a similar report in The BMJ 25 years ago. Should we be concerned? Is male reproductive health really at risk?

Meta-analyses have some inherent limitations. However, an important and often overlooked point about data on the quality of semen is that trend data should be interpreted with a holistic view of male reproductive health problems, including parallel trends in testicular germ cell cancer (TGCC). Incidence of this cancer has risen substantially over the past few decades, particularly in young men.

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Issue: 11 Volume: 2

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