A Danish sperm donor linked to a cancer-causing gene has fathered at least 67 children, primarily in Belgium, raising significant health concerns.

The scandal first emerged after two Danish children diagnosed with cancer were found to share the same gene mutation as the donor.

This donor carries a TP53 gene mutation associated with Li-Fraumeni syndrome, which significantly increases the risk of developing various cancers, with a lifetime risk of up to 90% by age 60 for carriers.

Among the 67 children conceived with the donor's sperm, 23 have been found to carry the mutation, and ten have developed different types of cancer.

Between 2008 and 2015, the donor's sperm was used in 14 Belgian fertility centers, resulting in 52 births from 37 women, despite regulations limiting donors to six women each.

Belgian Health Minister Frank Vandenbroucke was only recently informed of the situation, despite the Federal Agency for Medicines and Health Products alerting authorities in 2023.

The mutation was not recognized as cancer-causing at the time the donor's sperm was used, and it was only discovered after multiple families reported cancer diagnoses.

Affected families now face ongoing medical surveillance, including regular MRI scans and evaluations, to manage the risks associated with the mutation.

This incident underscores the need for robust safety regulations in reproductive technology to protect the well-being of all parties involved.

Currently, some countries limit donor offspring to ten children, while others, like the United States, have no restrictions, complicating health tracking.

The case has prompted calls for enhanced genetic counseling and better donor screening protocols to improve screening efficiency and reduce costs.

The health minister expressed concerns about how to responsibly inform the affected families about the situation.