Maybe.
But if a virus can destroy healthy cells why not abnormal ones?
In the case of the glioblastoma and polio virus it may make sense that a modified polio virus can kill mutant brain cells.
Just wondering...
While I realize that the virus is genetically engineered for this purpose and is apparently contained, I still have to wonder, by what mechanism is the virus made self-limiting to a given type of cancerous tumor? Could genetically engineered polio or measles enter into the general population via some unintentional means with dire consequence?