^^ Not my area, specifically, but I do work on viruses and their ability to cause cancer, and how they can control whether cells live and develop into tumors or ultimately die in some virus infections. Anyway, oncolytic viruses are very real, and a number of targeted herpes viruses have been developed (and are in early clinical trials) to treat glioblastomas (there are other cancer oncolytics for other cancers as well). Some are directly lytic to tumor cells, and some alter the ability of tumors to resist conventional chemotherapy. So far, the data look very promising, but, the nature of intentionally delivering viruses to the brain as therapy is a major regulatory hurdle for regulatory agencies. One has to demonstrate a very low risk of potential inflammatory response (and for some viruses, transformation/cancer induction) in the brain, and this is likely to slow down the application of the technology to actual 'main stream' patients. In any event, from reading the papers, the data look very, very promising, and for some people this is an 'only hope' type therapy, so to me the potential risk is better than doing nothing. I suspect this will be a standard therapy in a decade or two, but for now it is still full of unknowns. Bottom line, everyone is a little gun shy from a regulatory standpoint from the attempts at using adenovirus to treat cystic fibrosis that was a failure that resulted in the death of a test subject. I think we have advanced a lot since then, but we are not ready yet.