I recently saw an episode of House MD, in which a teenage boy with leukemia was about to receive a marrow transplant from his brother. He’d already been irradiated - and the younger brother started sneezing. This of course kicked off a long, overly dramatic, convoluted search for the cause of the sneezing (and subsequent symptoms) because otherwise the marrow woulda killed the leukemia-stricken brother. And they only had a few days to do it because hey, they’d already nuked the patient’s own marrow.
OK - why do they do the nuking PRIOR to harvesting the marrow. I mean, what if the donor gets hit by a car on the way to do the donation. Couldn’t they harvest the marrow, freeze it for a couple of days, then do the transfusion?
Secondly: in this particular situation, couldn’t they buy the patient some time - at least a few days - by doing a lot of blood transfusions?