Yeah, I guess you're talking about
Stelara? Supposedly the same as Tysabri without the PML cases? From what I have read though, this new drug Stelara is at a point in the development process where, when Tysabri was at a similar testing phase, it was not showing as a cause of PML by that early stage either.
That sentence was horribly constucted hope it makes sense.
Edit: I think the similar, derived drug is vedolizumab not stelara, but I'm not sure.