1. Only (a small amount of) the virus needs to get to the cancer. "They replicate, you get a million copies in each cell and the cell bursts and they infect the tumour cells (adjacent and repeat the process)," said Prof Seymour. 2. (Preliminary research on mice) shows that the viruses work well on tumours resistant to standard cancer drugs. "It's an interesting possibility that they may have an advantage in (killing drug-resistant tumours), which could be quite different to anything we've had before." 3. Researchers (have known for some time that) viruses can kill tumour cells and some aspects of the work have already been published in (scientific journals). American scientists have (previously injected viruses) directly into tumours but this technique will not work if (the cancer is inaccessible) or has spread throughout the body. 4. Prof Seymour's (innovative solution is to) mask the virus from the body's (immune system), effectively allowing the viruses to do what chemotherapy drugs do - spread through the blood and reach tumours wherever they are. The big hurdle has (always been to find a way to deliver viruses) to tumours via the bloodstream without the (body's immune system destroying them) on the way. 5. "What we've done is make chemical modifications (to the virus to put a polymer coat) around it - it's a stealth virus when you inject it," he said. 6. After the stealth virus infects the tumour, it (replicates), but the copies do not have the chemical (modifications). If they escape from the tumour, the copies (will be quickly recognised and mopped up) by the body's immune system.
