Sanford Burnham Prebys Mar 5 2026 Cells in our immune system are best known for providing security against external invaders such as bacteria and viruses. These immune cells also guard against internal threats, including cancerous tumors. Different forms of cancer cells and tumors have their own tricks for avoiding detection by the body's security system altogether or otherwise sabotaging any attempts to muster an immune response. In the case of the most common and difficult-to-treat form of