Girl’s death in China gene-editing trial was concealed, investigation finds

A 6-year-old girl died after receiving the world's first brain gene-editing treatment in China, and her death was never publicly reported, according to an investigation published on Wednesday by Science and Retraction Watch.science+2

The child, referred to by the pseudonym Mei, underwent the experimental procedure on March 24, 2025, at Xinhua Hospital under Shanghai Jiao Tong University School of Medicine. The treatment involved introducing trillions of viruses into her spinal fluid designed to deliver a base editor that would correct a genetic defect impairing her brain development. Within a week, Mei developed a fever and signs of kidney damage before dying. A hospital report identified an immune response to the viral vectors as the most probable cause of death.science

A Family's Costly Gamble

Mei's parents financed the development of her therapy themselves, gathering more than $800,000 to pay the research team under informal arrangements that the father later described as concerning. The family said they were told the risks were minimal and chose to proceed. After Mei's death, one of the researchers returned over $100,000 the parents had paid.science

The parents are now seeking accountability and have said they "did not know how unusual or dangerous many of the arrangements were". Several gene therapy and bioethics experts who reviewed the case questioned whether the family was adequately informed of the risks. "This never should have gone to trial," one expert told Science.science

Questions Over a Nature Paper

Nearly a year after Mei's death, the academic team published a paper in Nature presenting evidence of the therapy's efficacy in animal models. An earlier draft had referenced the family's genetics and their financial backing, but those details were removed from the final version. The parents had asked the team to withdraw the paper before publication and later sent a protest letter to Nature, citing their daughter's death and their funding of the research. The journal responded that ethical considerations were "outside our purview in terms of data integrity".science

Nature told Science that it had been unaware of Mei's death or the penalties the hospital faced for inadequate oversight during the paper's review process.science

China's Oversight Under Scrutiny

The case echoes the 2018 scandal involving He Jiankui, who was imprisoned for secretly editing human embryos. China tightened regulations afterward but has since reformed its system to expedite research on human therapies as it competes with the United States in biotechnology.xinhuanet+2

Joy Zhang, a sociologist at the University of Kent who studies secrecy in Chinese scientific institutions, said Mei's death and the subsequent silence indicate "there is still much work to be done". Stanford bioethicist Hank Greely cautioned that such research should continue with appropriate safeguards: "It's all too easy to be blinded by hope—whether for your child, your research, or your company".science