decades of effort have gone into making this type of treatment safe, but mistakes or lack of understanding have resulted in patients’ death and set the field ba

decades of effort have gone into making this type of treatment safe, but mistakes or lack of understanding have resulted in patients’ death and set the field back before, see for example: https://en.m.wikipedia.org/wiki/Jesse_Gelsinger https://en.m.wikipedia.org/wiki/Jesse_Gelsinger