Researchers from the Korea Institute of Science and Technology have developed these tiny machines that can penetrate cancer cells and destroy them.

The machines penetrate cancer cells using a “threaded latch molecule” designed to be released only in a low pH environment whose pH is slightly lower at 6.8, but do not penetrate normal cells whose pH is nearer to 7.4.

This seems very promising to me.

Scientists Develop “Nanomachines” That Can Penetrate and Kill Cancer Cells