To investigate whether myeloid cells may prevent NK cell–mediated killing of pancreatic cancer cells by this mechanism, the NOX2 inhibitor HDC (36, 37), the ROS scavenger catalase or the NOX2-specific inhibitor GSK2795039 (38) was added to cocultures of NK cells and primary myeloid cells. The gene discussed is CYBB; the disease is pancreatic neoplasm.