The book is based on a therapy used by more than 170 Soviet and Russian medical doctors. According to their clinical observations and hundreds of Western studies, low body oxygenation is the key factor that promotes cancer. These observations resulted in a unique clinical trial on cancer patients organized by one of the Ukrainian physicians who applied the Buteyko method on 120 people with metastatic cancer. The book "Doctors Who Cure Cancer" provides detailed analysis of the method since this is the most successful clinical trial in the whole history of cancer research. The tested cancer therapy was based on breathing retraining or teaching patients who to breathe in accordance with medical norms days and nights. Here are some details of this trial. Early metastatic cancers are deadly, but even these cancers can be cured For early stages of metastasis, the typical 3- or 5-year survival rate is usually about 70-80%. In this astonishing published clinical trial, the survival rate in the control group was about 76%. But 96% of people in the main group, which practiced breathing exercises (to increase body oxygenation), in addition to standard medical therapies, survived. Therefore, this self-oxygenation technique naturally reduced mortality almost 6 times! There were only 2 people in the experimental group who died, but both had serious additional healt problems (heart disease and diabetes). But all those who had only cancer survived. This can be the most powerful natural cancer cure used by doctors. Can we cure cancer naturally? The trial was published in Ukrainian Oncology Journal (Kiev). This self-oxygenation method has been used by more than 160 Soviet and Russian medical doctors on over 200,000 patients, many of whom had cancers. Prior to this clinical trial, these Soviet and Russian MDs tested hundreds of people with cancers and found that all of them had heavy breathing pattern with low results for the DIY body oxygen test. These doctors discovered that dynamic of cancer (stalemate, metastasis or regression of tumors) depends on breathing patterns and body oxygenation. They developed a program for cancer treatment that is based on simple breathing exercises and lifestyle changes. Breathing parameters in people with cancer Several Western studies (described in this book) measured minute ventilation, respiratory frequency and end-tidal CO2 in people with cancer. All these medical publications found that virtually each and every person with cancer: -breathed about 2 times more air per minute than the medical norm -had very low exhaled CO2 content (about 2 times less for people with metastasis) -had increased respiratory rate at rest (up to 30-40 breaths/min instead of normal 10-12 breaths/minute). This is called "hyperventilation" or breathing more than the medical norm. Overbreathing, according to hundreds of clinical studies, reduces O2 levels in body cells. Review of other breathing therapies for treatment of cancer Apart from the Buteyko breathing method used by more than 150 doctors, this book reviews other self-oxygenation techniques and breathing exercises that increase body oxygenation. The book suggests that people can cure cancer naturally if they normalize their automatic breathing and achieve about 40 seconds for the simple DIY body oxygen test.