There are natural treatments that are just as effective. I trust them more because they are God-given. That would be my choice if I ever have to choose.
I have never heard of anyone who had pancreatic cancer who was cured by "natural treatments." I do know people who were healed by miracles, but in general God works through doctors and nurses, by medical researchers whose brains He created, and through the technology that harnesses His science to help people. What makes people think that He is not the one who guides lifesaving research? Modern medicine is just as God-given as some herb.
And honestly, you don't know what choice you would make in cancer treatment until you're looking death in the eye.