The United Nations has a slogan: “Never die of ignorance”. But the reality is that many oncology patients die of ignorance, which is very wrong! In her book “The Truth: A Misguided War on Cancer”, Davis, a famous American oncologist, pointed out that “cancer thrives on ignorance and can be fought with knowledge” and that by strengthening knowledge about tumors, “we can save more lives” and even save up to “one of the most common diseases that die every year”. We can save more lives” and even save up to “40% of the people who die from cancer every year. Facing the ravages of cancer, we should first realize that tumor is not terrible, and like other chronic diseases, it can be avoided through active preventive measures; secondly, regular medical checkups and early diagnosis make it possible to cure most tumors, which must be taken seriously; again, even if you have a tumor, it is not an incurable disease. “Remember, tumor itself is not fatal, many tumor patients actually do not die because of the disease, but are crushed by the great fear after getting tumor. More importantly, when you have tumor, you should believe in science, actively acquire scientific and reasonable related knowledge, and use knowledge to fight against tumor. It is reported that unreasonable use of drugs by tumor patients is a key factor affecting their 5-year survival rate. At present, there are more and more anti-cancer drugs in the medical market, especially anti-cancer Chinese medicine, and even many health care products claim to be able to “cure cancer”, which makes the phenomenon of unreasonable use of drugs more prominent. Professor Tang Jingbo, head of the expert group of the Drug Evaluation Center of the State Food and Drug Administration, pointed out, “At present, only 20% of cancer patients are in compliance with the standard drug use, and up to 20% are not in compliance at all.” In addition, for the current reality of high incidence of tumor, many businessmen aim at the growing market of tumor treatment. In recent years, under the signboard of “trace elements” (selenium), “magical Chinese medicine” (lingzhi, cordyceps, etc.) and so on, the loss of money is a small matter, because the belief in these “panacea” has delayed the regular treatment. “The loss of money is a minor matter, but there are many people who have lost their lives because they have delayed their regular treatment and lost their precious lives. For example, Ganoderma lucidum is not a “magic elixir” to fight cancer, it does have the effect of stopping bleeding and calming the mind, tonifying the kidney and nourishing the heart, but it can only be used as an adjunct to anti-cancer treatment, nowadays, many pharmaceutical companies and drug dealers’ medical advertisements, and probably the hype of medical doctors, over-exaggerate its anti-cancer effect and mislead patients to take Ganoderma lucidum-like preparations with adjunct regulation as the main treatment. This not only wastes a lot of money, but also misses the time of treatment. There is also the issue of life taboos and daily care for tumor patients. Because of the traditional culture, Chinese people are often very concerned about this point after getting tumor, especially how to avoid eating? This is the most important issue for tumor patients. Many so-called “old Chinese doctors” often warn patients not to eat “chicken, duck, fish and meat”, “spicy and oily meat”, and not even to touch eggs, and finally patients can only have three meals a day. In the end, patients can only pass their days with three meals a day. Tumor itself is a kind of high metabolic disease, which will frantically rob the nutrition of the body, plus the various traumatic treatments that patients have to undergo will damage the vital energy of the body, if they cannot ensure reasonable nutrition, patients may not wait until they are “sick and die”, they will be “starved to death” first. If reasonable nutrition is not ensured, the patient may be “starved to death” before “dying of illness”.