Is tumor heterogeneity going to minimize hope on Personalized/ Individualized Treatment options

http://www.foxnews.com/health/2012/03/08/cancer-gene-mutation-more-complex-than-previously-thought/

http://www.latimes.com/health/boostershots/la-heb-cancer-mutations-20120308,0,5543129.story 

http://www.cbsnews.com/8301-504763_162-57393292-10391704/gene-differences-in-tumors-making-cancer-treatment-difficult/