Is taking the immunosuppressants for the rest of his life aspect unique to his particular bone marrow transplant procedure? My father had a bone marrow transplant several years ago, and was off medication within a year IIRC. (At the least, I know he takes no medication currently.)

The article does say 'stem cell replacement'. I'm not medically savvy enough to know how different that is from the 'traditional' bone marrow transplant. Can someone help me out?