This article I have found states that the survival rate with MS related PML is up around the 70% mark - BUT consequential disability is usually high. IRIS or immune reconstitution inflammatory syndrome occurs, in almost all patients after they are treated with plasma exchange to rapidly remove all traces of the drug.

IRIS results (as the name suggests) in brain inflammation - my doc kind of explained it like having very serious back-to-back or concurrent relapses.

Janet, read this article - one thing that did strike me when I was reading your earlier post was that you mentioned other health problems, and I wondered about past drug interactions - if you are JC+ and have used certain other drugs (methotextrate to name one - but I know there are more - especially cancer drugs) - then for sure your risk for PML with Tysabri increases massively I don't know about Tec, but worth checking.

http://www.medpagetoday.com/Neurolog...eurology/26628

Regards