Doctors have linked a boy's tumor to a gene therapy, but say the rare risks need to be weighed against the profound benefits such medicines can offer.
When 13-month-old Adams stem cell transplant failed, doctors had two options: a second transplant, which they warned carried a 10% to 15% risk of death, or a new and untested gene therapy.
His paren… [+637 chars]
His paren… [+637 chars]