Has anyone heard about the new trials for cancer in canada using the small pox virus

I was listening to public radio (they were talking with a Canadian Doctor) and they are using some cancer patients in a trial run to see if the small pox virus (we got as children)will kill cancer cells. They said if I understood it right that cancer cells invade good cells and kill of the good cells ability to fight off infections (viruses). So cancer cells can not fight off infections (viruses) so by injecting the patient with the small pox virus intravenously the small pox virus migrates to the cancer cells and the virus kills or stops the cancer cells from growing. They are doing the trials at this time on Liver cancer patients with no hope left (their cancer is not responding to treatment anymore) with some success. Just thought it was an interesting concept.