It's both extremely sci-fi and incredibly terrifying that one of the steps for a cure is to quote unquote kill all living bone marrow. Modern medicine is fascinating in how advanced it can be.
Yeah it's a spectacular transplant procedure, though it's really not that modern medicine, it has been developed since the 50s! The step where you irradiate or apply chemo to kill off the existing bone marrow had to be done at first because the patients had leukemia so you had to do this anyway. An interesting thing is that if there are still cells left in you, they will be wiped clean by the new transplanted immune system in a so called graft-vs-host response that also sounds like a horror-movie concept :)
not sure if you need to kill absolutely all living bone marrow. Unlike cancer having 5% sickle cell red blood cells is probably fine. That makes the chemo probably way less bad than what you would need for cancer.