A new immunotherapy strategy boosts the cancer-killing power of natural killer cells, helping them overcome tumors’ defenses and attack hard-to-treat cancers. Credit: Shutterstock Scientists have developed a new way to strengthen the cancer-fighting abilities of natural killer (NK) cells, a type of immune cell that serves as one of the body's first defenses against disease. The strategy could help these cells overcome the protective barriers many tumors use to avoid being destroyed. Researchers