Scientists at Baylor College of Medicine discovered that cancer cells attempting to hide from the immune system may be making themselves easier to kill. Tumors often shut down a surface protein called MHC class I to evade CD8+ killer T cells. But new research published in Nature Immunology shows this tactic leaves them vulnerable to CD4+ helper T cells, which respond by triggering ferroptosis — a form of cell death driven by iron-dependent oxidative stress. The finding overturns a decades-old immunology principle that these two immune pathways operate independently. The discovery may reshape how cancer immunotherapies are designed and could also inform treatment of bone marrow transplant complications.
