holy_calamity writes "New Scientist reports on a sneaky new approach to getting the immune system to fight cancer. An implant releases a 'molecular perfume' irresistible to messenger immune cells, which enter the implant where they are given a sample of the cancer's 'scent' and a disperse signal that sends them scurrying to the nearest lymph node. There they convince other immune cells to start attacking anything that matches the sample they picked up."
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