it's not the cancer that kills you, it's the dangerous Cancer drugs. Ivermectin is the ingredient that gives them any efficacy, at all.
https://www.frontiersin.org/articles/10.3389/fphar.2021.717529/full
https://wentworthreport.com/ivermectin-and-cancer/
https://i2b.us/anti-parasite-drug-ivermectin-shows-promise-against-cancer/
https://www.naturalnews.com/2022-04-15-ivermectin-cancer-cure-nine-studies-conclude.html
It also probably means cancer is parasitic
Or related to infection by parasite, meaning presence of parasite weakens or impacts immune system such that cancer cells aren't disposed of normally.