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May 26, 2025 — In a case that has sent shockwaves through the fertility industry, a sperm donor carrying a rare cancer-causing gene mutation has fathered at least 67 children across Europe, with 10 of those children now diagnosed with cancer. The incident, first reported by The Guardian and covered by Hindustan Times, has reignited urgent discussions about the medical and ethical risks of using a single donor’s sperm for numerous conceptions.
The Unfolding Case
Between 2008 and 2015, dozens of children were conceived using sperm from the same donor, who was later found to carry a mutation in the TP53 gene—a variant known to significantly increase the risk of developing certain cancers. The European Sperm Bank, which supplied the donor’s sperm, confirmed the presence of this mutation after families reported cancer diagnoses in their children.
So far, 67 children from 46 families in eight European countries have been tested for the gene. Of these, 23 children were found to carry the mutation, and 10 have already been diagnosed with leukemia or non-Hodgkin lymphoma.
Challenges in Tracing and Notification
The discovery has highlighted the difficulties of tracing and notifying families when a genetic disease is identified after conception. Fertility clinics were able to contact only some families after doctors linked two children’s illnesses to the rare genetic variant. With families spread across multiple countries, experts warn that post-diagnosis tracing is often nearly impossible.
Sperm Bank Response and Industry Concerns
Julie Paulli Budtz, spokesperson for the European Sperm Bank, expressed deep concern over the situation. She emphasized that the donor had undergone extensive medical screening at the time, but the cancer-causing potential of the TP53 mutation was not known in 2008. “It is scientifically simply not possible to detect disease-causing mutations in a person’s gene pool if you don’t know what you are looking for,” Budtz stated.
The European Sperm Bank has implemented a self-imposed international limit of 75 families per donor and advocates for a globally mandated family limit. However, experts argue that even this threshold can result in the “abnormal dissemination of genetic disease,” especially when rare mutations go undetected.
Calls for Reform
Medical professionals and ethicists are now calling for improved tracking systems for donor sperm usage, better genetic screening protocols, and greater transparency for recipient families. The case underscores the need for international cooperation and regulation to prevent similar tragedies in the future.
Disclaimer:
This article is based on information reported by Hindustan Times and The Guardian. Details are subject to ongoing investigation and may evolve as more information becomes available. The medical information provided should not be considered as professional medical advice. For specific concerns or questions, please consult a qualified healthcare provider.
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