Natural Killer (NK) cells bridge innate and adaptive immunity, ensuring fast protection from viruses and cancer cells. By detecting missing or altered “self” markers, they target and destroy abnormal cells. Research on NK cell-based therapies is opening new possibilities in immunotherapy, offering safer, more effective treatments for patients battling cancer and chronic infections. https://xelleratherapeutics.bcz.com/2025/10/03/natural-killer-cells-the-bodys-first-line-of-immune-defense/