If one were to jump to a simplistic conclusion, assuming this is true, it would be that cancer is parasitic in nature.
Anti-parasitic drug nitazoxanide (NTZ) used to treat human tapeworm infection has been shown to inhibit growth of human prostate and colon cancers:
https://labiotech.eu/medical/prostate-cancer-parasite-norway/
My Doctor told me that when I was diagnosed.He said specifically to think of my tumor as a parasite.