Virus with anticancer effects

Researchers at Stanford University, have produced a genetically engineered virus
with specific anticancer effects.
Known as Onyx-015, it attacks cancer cells while leaving normal cells unaffected.
In trials on patients with intestinal cancers that had spread to the liver and could
no longer be treated by surgery.
Onyx-015 was injected into the liver artery.
It successfully shrank the tumors,thus prolonging the patients' lives.