Gene therapy linked to brain tumor in boy with genetic disorder
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A boy who received life-saving gene therapy for a genetic disorder later developed a brain tumor, which genetic analysis linked to the virus used in the treatment. The case, reported in Nature on May 21, 2026, is a rare instance of cancer caused by a therapeutic virus. Researchers are investigating the mechanisms to improve future safety.
The Case
A child with a rare genetic disorder received gene therapy using a modified virus to deliver a corrective gene. Years later, the boy developed a brain tumor. Genetic sequencing revealed that the virus had integrated into the child's DNA near a cancer-related gene, potentially triggering tumor growth.
The Investigation
Researchers from multiple institutions conducted genomic analysis of the tumor tissue. They found the viral vector inserted near the proto-oncogene MYB, which is associated with certain cancers. The study, published in Nature on May 21, 2026, estimates the risk of such an event at less than 1 in 10,000 patients.
Implications for Gene Therapy
The finding underscores a known but rare risk of viral vector-based gene therapies. Regulatory agencies and developers are reviewing safety protocols. The boy is receiving treatment for the tumor, and his prognosis remains guarded.
Brain-delivered gene therapy approval
The first brain-delivered gene therapy for AADC deficiency was approved in Europe and the U.K. in 2023. The therapy delivers a corrective gene directly to the brain using a viral vector.
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