Scientists cancer cells have invaded from the tens of thousands of viruses that have come through the immune system to the tumor.
Using viruses to kill cancer cells is a new branch in tumor therapy, and one of the challenges is to get deep inside the tumor viruses so that they can act.
Researchers their study, published in the journal Cancer Research, rated this as 'exciting', but still need to do testing on humans.
After a 40-day 'Trojan horse' therapy, all mice that were used in the experiment were alive and their tumor was withdrawn.
