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The concept behind this trial is to see if starting radiation therapy the same time as the initial surgery instead of a few weeks later will work much better. Usually, you wait until the surgical incision heals before starting radiation. This gives the tumor a chance to start growing back. Implanting GammaTile at the time of surgery starts the radiation immediately not giving the tumor that extra time to grow back. Makes sense. And since the radiation is only delivered where it is needed, it shouldn't interfere with the wound haling from the surgery.