Using genetically modified viruses to attack tumour cells could open a "wave" of potential new treatments:
http://www.independent.co.uk/life-style/health-and-families/health-news/world-first-as-scientists-provide-proof-that-viruses-can-combat-cancer-10277315.html
http://www.independent.co.uk/life-style/health-and-families/health-news/world-first-as-scientists-provide-proof-that-viruses-can-combat-cancer-10277315.html