Common Virus Kills Cancer Stem Cells

It is only within the past few years that the scientific community has understood the full significance of cancer stem cells and the urgent need to find a means of eliminating them.

“Cancer stem cells are essentially mother cells,” explains Dr. Lee, Cameron Chair in Basic Cancer Research at Dalhousie Medical School. “They continuously produce new cancer cells, aggressively forming tumours even when there are only a few of them.”

Cancer stem cells are difficult to kill as they respond poorly to chemotherapy and radiation. As Dr. Lee notes, “You can kill all the regular cancer cells in a tumour, but as long as there are cancer stem cells present, disease will recur.”

Dr. Lee is optimistic that his team has found the key to destroying cancer stem cells. The researchers have recently shown that human reovirus, a common virus that does not cause disease, effectively targets and kills cancer stem cells in breast cancer tissue.

“We suspected that reovirus might be effective against cancer stem cells, because we have shown time and again how well it destroys regular cancer cells,” remarks Dr. Lee, who was the first in the world to discover that a benign and naturally occurring virus could selectively infect and kill cancer cells without harming healthy cells. A Calgary-based company, Oncolytics Biotech Inc., is testing reovirus in clinical trials to prove the treatments are safe and effective.

Unlike most cancer studies, which use cancer cell lines developed for laboratory use, this study used fresh breast cancer tissue. This cancer tissue was removed from a patient of Dr. Carman Giacomantonio, a Capital Health surgical oncologist who is working with Dr. Lee on the reovirus research, along with post-doctoral fellow Dr. Paola Marcato and research assistant Cheryl Dean.

In addition to its ability to kill cancer cells and cancer stem cells, reovirus stimulates the anti-cancer immune system. Since virus therapy also invokes an anti-virus response, Dr. Lee and post-doctoral fellow Dr. Shashi Gujar are working on a way to harness the immune system so it attacks cancer cells while allowing the virus to freely infect and destroy cancerous cells. “Refining this two-pronged approach to killing cancer is our next step,” says Dr. Lee. “We are taking advantage of the natural characteristics of reovirus and the immune system itself to create a powerful virus-based anti-cancer therapy."

Dr. Lee’s discovery that reovirus effectively targets breast cancer stem cells has captured the attention of LeadDiscovery, a UK-based organization dedicated to promoting drug discovery and development. LeadDiscovery has identified the finding to be of particular interest to the drug development sector and will feature it in its next update to the global scientific community and pharmaceutical industry.