At least 197 children were fathered by sperm donor with cancer-causing gene. Some have already died

A sperm donor with a rare genetic mutation linked to an increased risk of developing cancer fathered at least 197 children across Europe, some of whom have already died from the disease, according to a new investigation.

​ A sperm donor with a rare genetic mutation linked to an increased risk of developing cancer fathered at least 197 children across Europe, some of whom have already died from the disease, according to a new investigation. Read More Breaking News, Latest News and Videos | CNN