Researchers at Cardiff University (UK) have discovered a new type of killer immune cell (T-cell) that has the potential to be an effective therapy against numerous types of cancer. T-cell therapies are a growing field in cancer treatment. The way it works is that immune cells are removed to be modified, and then they are returned to the patient's blood to seek and destroy cancer cells. However, up to now this process could only target a limited number of cancers, and was not successful against solid tumours - which make up the majority of cancers. These newly discovered T-cells are equipped with a T-cell receptor (TCR), which recognises and kills most human cancer types while ignoring healthy cells.