Conquering cancer with implants

Instead of surgery or toxic drugs what if doctors could simply implant tools in our bodies to do the work internally?

Scientific American: New tool that can be implanted in the body to kill cancer. One team of researchers has been able to vanquish tumors in mice by implanting bioengineered disks filled with tumor-specific antigens, and another has developed magnetized nanodiscs to induce cancer cells destroy themselves.