Scientists from Cardiff University in the UK have discovered a part of our immune system that could be harnessed to kill all types of cancer. Despite their work being at an early stage, the team says the newly-discovered technique killed prostate, breast, lung and other cancers in lab tests. The findings of their research, which are published in the journal Nature Immunology, have not yet been tested in humans, but, nevertheless, the researchers say they hold “enormous potential.” The scientists made their potentially game-changing discovery while looking for “unconventional” ways the immune system naturally attacks tumours. They found a T-cell in blood that could find and kill a wide range of cancers, while leaving normal tissues untouched. Speaking about their findings, researcher Prof Andrew Sewell said: “It raises the prospect of a 'one-size-fits-all' cancer treatment, a single type of T-cell that could be capable of destroying many different types of cancers across the population.” While T-cell cancer therapies are nothing new, with treatments like CAR-T already being used to seek out and destroy cancer, the Cardiff researchers’ discovery is exciting because it could lead to treatments being developed that are more effective against solid cancers (those that form tumours). The researchers say their discovery has the potential to lead to a "universal" cancer treatment.