Realizing that this is kinda old news I decided to write on it anyway, Elan, Biogen Sink on Third Tysabri-Linked Illness. It was certainly bad before, but a case of PML where there was only the use of Tysabri seems like it could be the final nail in the coffin. Too bad, Tysabri certainly seemed to be an excellent drug for MS; unfortunately a little too powerful. I guess the question then becomes can the drop the dosage, frequency, etc. to see if that will work or maybe they will just blame it on the use in combination with azathioprine. On the other hand is it even ethical to do that kind of testing with the possibility of the risks? -I would ask “would anyone even be willing to go on another Tysabri trial” but no doubt there are plenty who would take it as it is now even with the risks.