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" ... Changing the course of treatment based on monitoring techniques other than traditional CT and MRI scans is not entirely a new concept. An analysis method called flow cytometry, which uses lasers and fluorescently-labelled markers to identify certain types of blood cell, sifting through a sample at a rate of thousands of cells per second has been used for decades to look for tiny numbers of lingering leukemia cells in blood samples that are too sparse to be seen under a microscope by a pathologist. This information is then used to decide whether to ramp up treatment to target any leukemia cells before they multiply into full-blown relapsed disease, which is notoriously hard to treat. ... "