Sperm from donor with cancer-causing gene was used to conceive almost 200 children

Some children have already died and only a minority who inherit the mutation will escape cancer in their lifetimes.

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Some children have already died and only a minority who inherit the mutation will escape cancer in their lifetimes.

The sperm was not sold to UK clinics, but the BBC can confirm a "very small" number of British families, who have been informed, used the donor's sperm while having fertility treatment in Denmark.

Denmark's European Sperm Bank, which sold the sperm, said families affected had their "deepest sympathy" and admitted the sperm was used to make too many babies in some countries.

The investigation has been conducted by 14 public service broadcasters, including the BBC, as part of the European Broadcasting Union's Investigative Journalism Network.