It's a big step though. Killing cancer cells is easy. The difficult bit is killing only cancer cells. This seems to be a promising way to do that.
Titles like these can be cruel for people fighting or with loved ones fighting because it's a false sense of hope for those who currently need it.
I am stoked about the research though, the ability to actually distinguish between cancer and noncancerous cells is a huge breakthrough if this translates into humans.