The reason Fen. & Iverm. work is because cancer is a parasite, think of the tumors and growths as growing protective environments for the parasites to multiply, travel and consume. These parasites feed and infest cells that are almost dead or cell walls that are deteriorating due to toxins. There was a study done on more then 200 different cancer samples and what they found in every sample was microscopic parasites, that would infest, consume and begin a tumorous growth that other healthy cells would stick to, obsorb and starve the cells until they were weak enough to be infested.