You have no idea how sick and twisted greedy people can be.
Yes. There are/were several natural plant-based remedies/cures for many things, including cancer.
Problem is, corporations cannot patent Mother Nature.
Thus, we have chemical based "treatments", which are known to have serious "side effects", but thanks to big pharma lobbyists and corrupt politicians, legislators, and lawyers, corporations are allowed to "test" these probably unsafe "medicines" on the generally ignorant public without any fear of repercussions.