Dr. Gerson practiced in the US after coming from Germany during WWII. He was told they treat, not cure, in this country. He had terrible headaches which lead to a high potassium diet approach which started helping turberculosis and cancer patients. This evolved into more and more natural foods high in veggies, devoid of salt, fats and animal protein. His approach has all the things they have been finding as anti-cancer- carrot/apple juice, green juice from lettuce and tops from beets, special soup with potatoes, onions, leeks, celery and parsley root, garlic, tomatoes, slow cooked for 3 hours. The primary focus of it all is strengthening the liver, and also starving and dissolving the cancer. There are hourly juices. The potassium supplement was a result of 100 experiments to get a combination of 4 different potassium compounds, that would go into cells and displace sodium. Cancer in general has a fermentation metabolism that loves sodium and needs little oxygen. The therapy gets blood and potassium in there, as well as the carotenoids and other things that stop the cancer or slow it down. Another key factor is the juices must be very fresh, to not destroy the oxidizing enzymes (your body also oxidizes germs with hydrogen peroxide mfg by immune cells); in fact intravenous hyd peroxide is very effective with cancer supposedly, as well as emphyesema- provides oxygen to cells. Also a juice press is needed, not centrifugal, which strips off the charge on the juice, making it ineffective at getting into the cells. Gerson also talks about studies that measured the electrical potential of organs and how they diminished with poisons. This is still an unexplored area I think. Dr. Albert Schweitzer called Gerson an eminent genius, as he renewed Schweitzer's life who went on to do his best work. The book has 50 cases documented cures. Gerson also took some of his cases before Senator Claude Pepper's commitee in the 50s and was narrowly voted down for the gov't to sponsor research in his methods. Morris Fishbein of the AMA harassed Gerson many years, and Fishbein was forced to retract his slanderous article against Gerson in the AMA Journal. Gerson treated John Gunther in Death Be Not Proud, and he got much better, but other doctors decided to try reverse hormones on him as that was the latest thing, and it worked for a short time, then the cancer came back wildly and he died.
THe book is old, 50s,in fact he had to rewrite it after someone broke into his house and stole his manuscripts. Bizarre. Anyway there is a lot of good info in the book. It will not cure all cancers. And there is more to cancer than diet. It requires other life changes. This treatment is a challenge, and may not be suitable for some that cannot handle the low protein initially ("pot" cheese is added later). I think you still need to adjust it to the individual. But the book is surprisingly prophetic on what will happen with poor diets, poor soil, etc. We are seeing it today. It is worth the money, cancer or not.
Gerson.org has other books/videos about people that have used the diet and are cured, including a woman M.D. I am not affiliated with the Gerson Institute, just interested in natural remedies.