There is success reported in the use of High-Intensity Focused Ultrasound to rupture tumerous cells and cause the body's immune system to recognize and attack the cancer:
An intense form of ultrasound that shakes a tumor until its cells start to leak can trigger an 'alarm' that enlists immune defenses against the cancerous invasion, according to a study led by researchers at Duke University's Pratt School of Engineering.
The new findings suggest that once activated by the ultrasound, the immune system might even seek and destroy cancer cells, including those that have spread through the bloodstream to lurk in other parts of the body.
The Influence Peddler has a regular reader who was worked on something similar to this. I promise that if he provides expert comment we won't make fun of him.