THe CIA was doing research back in the early 60's trying to find a cancer thay could use as a germ warfare agent. They couldn't find a lethal cancer.
UNTIL they started loading people up with radiation and chemicals. Then the cancer would kill folks. They experimanted on prisoners of our "legal" prison system.
The radiation and chemicals so lowered the immune system it made the cancer "terminal". True story.
Cancer has three causes, Chemicals, parasites and radiation. I had two out of three and it will kill you, but it takes much longer than "they" say.