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The headline is a little overstated, but this is worth looking at. Boron Neurtron Capture Therapy is an old treatment where a boron compound is given to the patient and it accumulates in the brain tumor. A neurton beam is then aimed at the tumor and it reacts with the boron to kill the cells that have taken up the boron and leave the other cells alone.
The problem was that the boron compounds used were not getting into all of the brain tumor cells and some were getting into normal cells. It was a small improvement over standard radiation therapy.
Now there are better ways of getting the boron into the tumor cells and sparing the normal cells so they are trying again.