The pill works by killing a mutated protein which helps cancers to repair Scientists hope it can be used as a standalone therapy or alongside treatments Scientists have developed a holy grail cancer drug that kills all solid cancer tumors while leaving other cells unharmed. The new molecule targets a protein present in most cancers that helps tumors grow and multiply in the body. It is significant because this protein - the proliferating cell nuclear antigen (PCNA) - was previously thought to be 'undruggable'. The drug was tested on 70 different cancer cells in the lab - including those derived...