Scientists Discover a Completely Unexpected Way T Cells Kill Cancer

Researchers found that lowering MHC class I can make cancer and other allogeneic cells more vulnerable to CD4+ T cell killing.

The attack can trigger ferroptosis, revealing an unexpected cell-death pathway in mouse models, human samples, and patient datasets.

The study challenges a long-standing immunology model that CD8+ T cells are the main killers of cells with reduced MHC class I.

It also showed relevance in graft-versus-host disease, pointing to new strategies for cancer immunotherapy and transplant care.