Researchers have devised a new tool for preventing metastasis: a reversible, drug-free antiplatelet therapy made from modified human platelets. Platelets, which are essential to the formation of blood clots, provide crucial protection against bleeding. However, hyperactive platelets are implicated in a number of illnesses, including heart attack, stroke, and cancer. By binding to tumor cells, platelets protect the tumor cells from the immune system. Furthermore, they may help cancer cells travel...