740 Pattern of natural killer (NK) cell (CD16+CD56+) expansion correlates with response outcomes with nemvaleukin alfa treatment by Omid Hamid, Vamsidhar Velcheti, David F McDermott, Marc S Ernstoff, John L Hays, Yangchun Du, Sonali Panchabhai, Sarah Donatelli, Daniel G Smith, Ulka N Vaishampayan