Yes I have heard of this one, as there's been much discussion and many trials of the drug happening here in Oz.

I believe that Alemtuzumab's trade name Campath came from the place that they formulated this drug. (Cambridge Pathology)

Alemtuzumab (marketed as Campath, MabCampath or Campath-1H) is a monoclonal antibody used in the treatment of chronic lymphocytic leukemia (CLL) and T-cell lymphoma..............Alemtuzumab is also used in some conditioning regimens for bone marrow transplantation and kidney transplantation. It is also used under clinical trial protocols for treatment of some autoimmune diseases, such as multiple sclerosis, in which it shows promise. http://en.wikipedia.org/wiki/Alemtuzumab

There's a heap of info about it on Campath's home page : http://www.campath.com/

Campath is not without nasty side effects, and you'll find some information about them on the above site, and on this one as well.
http://www.rxlist.com/campath-drug.htm#

Many trials for Campath are being held here in Australia at the moment, and even my own Neurologist is involved in the trials in my state. (No I'm not on it)