There are a couple of different types of immunotherapy, but this new discovery points to a facet of our immune system that could be harnessed to treat all cancers, according to researchers.

These recent findings, published in Nature Immunology, relate to a very specific category called T-cell therapy. T-cells are a kind of white blood cell. These cells have surface molecules all over them called receptors, and they patrol your body looking for stuff that shouldn’t be there.

The team at Cardiff University has actually showed that these T-cells can kill lung, liver, breast, melanoma, and other cancer cells—all while leaving healthy cells alone.