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One of the real rubs in cancer screening is trying to detect breakaway tumor cells before they spread too far, causing the cancer to metastasize throughout the body. There’s where a young biotech company called Bikanta comes in: the team has started to use fluorescent nanodiamonds — basically a dust of crushed, imperfect diamonds — to help ferret out those tiny, troublesome proto-tumors before they get a chance to spread.