A sperm donor with a cancer-causing genetic mutation has fathered nearly 200 babies across Europe, raising serious concerns about the safety of sperm donation. The anonymous student, who started donating in 2005, passed initial screening checks but later was found to have a mutation in some of his cells that damaged the TP53 gene, a critical protector against cancer. This mutation, present in up to 20% of his sperm, can lead to Li Fraumeni syndrome, a rare condition with a high risk of childhood cancer and breast cancer later in life. The affected families are now facing a devastating diagnosis, with some children already developing two different cancers and tragically passing away at a young age. The European Sperm Bank, the seller, has expressed sympathy and acknowledged the misuse of the sperm, despite the donor and his family being healthy. This case highlights the importance of rigorous screening and the potential long-term consequences of genetic mutations in sperm donors.
