Firstly - haven't times changed - both sisters would likely have been DFd in times past...
“When men of science conclude that this normal process will no longer work and they suggest removing the organ and replacing it directly with an organ from another human, this is simply a shortcut. Those who submit to such operations are thus living off the flesh of another human. That is cannibalistic.” (WT 15 Nov 1967, p. 702)Secondly - why is it that transfusion of white blood cells is wrong , yet removing the blood from your body , removing unwanted fractions (such as in apheresis http://en.wikipedia.org/wiki/Apheresis ) and then re-infusing is regarded as acceptable?