Nearly 200 children across Europe including some British families face a sky-high risk of cancer after a sperm donor, whose sperm was used for 17 years, was found to carry a hidden genetic mutation Computer illustration of sperm cells, or spermatozoon (Image: Getty Images/Science Photo Library RF)

Nearly 200 children may get cancer after a sperm donor unknowingly carried an extremely risky gene mutation. The terrifying discovery, which was revealed in a new bombshell investigation, showed that a handful of British families who travelled to Denmark for fertility treatment have been informed they may be affected.

The investigation , which was conducted by 14 public service broadcasters, was part of the European Broadcasting Union's Investigative Journalism Network. The shocking ex

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