At least 197 children, some of whom are British, have been placed at high risk of cancer because they were conceived using a Danish sperm donor who had a faulty gene .

Already, some of the children have developed cancer and died. All of those affected will need regular scans to check for tumours for the rest of their lives.

It is a medical catastrophe that could have been avoided. For years, doctors have been calling for fertility clinics to cap the number of children who can be conceived from the same sperm or egg donor. New Feature

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“It’s not natural for a man to have [so many] children,” said Dr Edwige Kasper, a cancer geneticist at Rouen University Hospital in France, who helped discover the scandal. “In case of genetic disease, i

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