The NK cells will be collected from the donor's blood and then processed in a lab at M. D. Anderson, where researchers will use a machine, called a CliniMACS device, to separate out the NK cells from the rest of the donor's collected white blood cells and treat them overnight with a drug called IL-2. This is done to make the NK cells stronger before they are given to the recipient. You will also receive IL-2 injections under your skin to try to help the NK cells survive longer and to possibly increase the number of NK cells in your body after the infusion.