1. British scientists are preparing to (launch) trials of a radical new way to fight cancer, which kills tumours by (infecting them with viruses) like the common cold. 2. If successful, virus (therapy) could eventually form a third pillar alongside radio therapy and (chemotherapy) in the standard arsenal against cancer, while avoiding some of the debilitating (side-effects). 3. Leonard Seymour, (a professor of gene therapy) at Oxford University, who has been working on the virus therapy with colleagues in London and the US, will (lead the trials) later this year. Cancer Research UK said yesterday that (it was excited by the potential of) Prof Seymour's pioneering techniques. 4. One of the country's leading geneticists, Prof Seymour (has been working with viruses that kill cancer cells directly), while avoiding harm to (healthy tissue). "In principle, you've got something which could be many times more effective than regular chemotherapy," he said. 5. Cancer-killing viruses exploit the fact (that cancer cells suppress) the body's local immunesystem. "If a cancer doesn't do that, the immune system (wipes it out). If you can get a virus into a tumour, viruses find them a very good place to be because （there's no immune system to stop them replicating）. You can regard it as the cancer's Achilles' heel."
