Be mindful. Vitamin B17 won't destroy a tumor. B17 kills the malignant aspect (cells) of the tumor. The tumor will swell as the B17 releases its cyanide/benzaldehyde/sugar. The swelling is alarming, for those who don't expect it. Tumors are 90-95% benign, meaning: they don't shrink considerably when the cancer is gone. Surgery is required, after B17 therapy, if the tumor is impinging on nerves and/or blood vessels.
I have scads of cancer books, the problem being: they're all *******. Cancer is a vitamin-deficiency disease. Its complexity is stupefying (as is the structure of a chihuahua's nostrils) yet, like pernicious anemia, pellagra, scurvy, beriberi & others, cancer's cure abounds in nature. Basically, the seeds of all fruits (save North American citrus) carry amygdalin (B17). On the way to chemo "treatment" a patient walks through & drives by the cure for cancer: green plants. The applied info cured my mother, my father & my sister-in-law in this little soap opera of mine. All relationships have a beginning, a middle & an ending.