To help prevent an allergic reaction to the infused NK cells (such as fever and chills), you will receive Benadryl (diphenhydramine) by vein, over 15-30 minutes, and Tylenol (acetaminophen) by mouth. You will also receive fluids by vein to help decrease the risk of kidney damage. If the study doctor thinks it is necessary, you may also receive a steroid to help prevent side effects.