Scientists have developed a new class of antibodies that can significantly strengthen the immune system in the fight against cancer. These antibodies have a special "four-pronged" structure, thanks to which they cluster immune receptors on the surface of T cells. The receptors normally receive only weak signals from tumor cells, but the new antibodies connect them in such a way that the T cells go into full attack mode. In early studies, these four-pronged antibodies outperformed conventional antibodies in their ability to activate T cells that kill cancer cells. The results show that antibodies modified in this way can enhance the natural anti-tumor response of the immune system. This work also suggests the potential for more effective forms of cancer immunotherapy in the future.