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" ... Most cell based therapies use a different type of modified immune cell; CAR T-cells. These therapies have shown initial promise in some types of blood cancer, but there have been several setbacks with side-effects in patients and the scaleability and cost of the technology. Importantly, the NK cells used on the patients in the new study were made from donated umbilical cord blood, whereas most CAR T-cell therapies currently rely on a long and expensive process of extracting T-cells from the patient themselves, genetically modifying them and expanding the cells before the therapy is ready for use. ... "