There was an interesting study released in Nature on efforts to use vaccines to fight cancer. There's a good overview of the study here.
The upshot of the study is a group of medical researchers in the U.K. and the U.S. have successfully cured prostate cancer in mice using a vaccine made partly from healthy human prostate DNA, delivered inside virus shells. This treatment could come to replace toxic chemotherapies, curing cancer with no painful side-effects.
Like much research of this kind, the practical applications and any new treatments to emerge from this research are probably years away. However, the science and where it is leading us is exciting as is the promise for cancer patients.