"Researchers at Rice University, along with a company called Nanospectra Biosciences, have determined that gold-covered nanoparticles, 20 times smaller than a red blood cell, will quickly pool in tumors when injected into the bloodstream. The nanoshells, when illuminated with a near-infrared laser (which otherwise passes harmlessly through living tissue), will heat up sufficiently to incinerate the tumors completely, in every test."
It will be a while before we see human trials, but this (and other options mentioned in their post) are encouraging.