What are some "cancer stem cell targeting drugs" that the article may be referring to?
Let me know if you actually find any that work. :)
Seriously, lots of companies talk about targeting CSCs, but I'd say Micromet is the only one I know of that has demonstrated any sort of success.
The recent IPO Verastem is targeting this field, but is very early.
All the rest (that I know of at least) I'm skeptical about until they provide some actual evidence that they can target CSCs. This field is tough because CSCs are thin on the ground to begin with - hard to even quantify how many (if any) are present in the first place.