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?
I wrote a short story on that, a virus based ‘cure’ that winds up killing millions
Titled “The Cure”. Fun to write, but screwing around with smallpox wouldn’t be my first choice.