This isn’t new, in fact, I believe the very first types of ‘cell therapies’ go as far back as the Egyptians when they noticed that tumors would shrink if you took pus and injected into a tumor. Of course the person died from sepsis, but it has been known for a long time that bacteria home towards the hypoxia environment in tumors and have anti-cancer properties. In fact, if you google hard enough you’ll find many companies out there who are pursuing this idea with genetically engineered live microbes for cancer treatments.