Theoretically "yes" , practically you have to cope with the fact, that the is a certain risk that the patient will not survive the transplantation. How will you "sell" to a family that their mother or father may be taken away in the "experiment", where the alternative is to survive with current medication and at least enjoy the coming 10 or even 20 years in relative good circumstances ? It's most and for all an ethical delimma until the day you can guarantee 100 % survival of the transplantation, which you cannot at moment.