Charm noted:

"most drugs or therapy that work on one virus don't work very well on another virus."

True - but the body of knowledge, techniques and equipment that got to that breakthrough is now available to researchers in related fields. And it's ecouraging to those working in the field: doctors aren't fond of having to nearly do in their patients with the treatment to have a decent chance of a cure.

Here's another encouraging story on Science Daily - a new methodology for in vitro studies of cancer:

http://www.sciencedaily.com/releases/2012/01/120111103906.htm