This is exactly how the Zombie Apocalypse happens.
https://thenerdynurse.com/anti-cancer-virus-destroys-cancer-creates-zombies/
For those interested in the history and hope for cancer immunotherapy they should read the excellent new book, “The Breakthrough: Immunotherapy and the Race to Cure Cancer”, by Charles Graber. Cancer is very adaptive and mutations that survive any treatment can hide out for years before reactivation so the word “cure” is not used. The best outcome is extending the years of remission as long as possible.
LOL! Good stuff!