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THE SPERM DONOR WHO SPREAD A CANCER GENE ACROSS EUROPE A man donated sperm to help families have kids but unknowingly passed along a rare cancer gene called TP53. Between 2008 and 2015, his sperm created at least 67 kids across 8 European countries. The TP53 gene usually stops tumors, but this variant let them grow unchecked. 10 of the children later developed cancers like leukemia and lymphoma. 2 families sounded the alarm when their kids got sick. Scientists discovered the sperm carried a mutation linked to Li-Fraumeni syndrome, a rare inherited cancer risk. Doctors now recommend these children get regular scans and check-ups to catch problems early. The sperm bank involved has a policy limiting one donor’s sperm to 75 families but won’t say how many kids came from this donor. Critics say this shows how weak the rules are worldwide, with some donors fathering more than 150 kids. It’s a cautionary tale about why genetic testing matters and why better rules are needed before one person’s DNA ends up in dozens of babies around the world.