$475k for the treatment, may go up as high as 750k, it is what Novartis new FDA approved first CAR-T cancer gene therapy price tag.
There is also the logistical aspect of needing to remove a patients T cell, modify them and place them back in the patient. How this will be done in a high through put commercial setting is yet to be seen. The ability to manufacture ones cells is also not guaranteed and doesn't work in all cases to date.