Plus, at that time, the thinking was that
PML was linked to
Tysabri being used in conjunction with other
MS treatments, especially interferon. And for 2 years, that seemed to be the case, and everyone was just starting to breathe a sigh of relief... :)
Novantrone scares me more, too. The cardiac toxicity is a major thing, and my neuro doesnt like to use it for that reason. But there are people who have used it and said it helped.