STAT+: Scientists link boy’s tumor to gene therapy viruses, in rare finding

Adam, a 13-month-old boy born with a life-threatening rare disease, underwent a gene therapy treatment after a stem cell transplant failed, and later developed a golf-ball sized tumor on his brain. The tumor was revealed during a routine scan last year. Adam's parents, Mary Beth and Dave Brennan, had chosen the gene therapy option due to the high risk of death associated with a second transplant.