In most people’s eyes, once a tumor is diagnosed, it is a death sentence, which is indeed true in most cases. For example, 60-70% of lung cancer is stage III-IV when diagnosed, and the 5-year survival rate of comprehensive treatment does not exceed 10%. Other common tumors that are difficult to be detected at early stage include esophageal cancer, stomach cancer, liver cancer, colorectal cancer, pancreatic cancer, cervical cancer and so on. The symptoms caused by tumors are mainly caused by external pressure, obstruction and painful external invasion. Once symptoms appear, most of them are already near the advanced stage, which is more difficult to cure. China has not yet established effective means of cancer screening, while European and American countries have embarked on the screening of prostate cancer and breast cancer. With the increase of patients diagnosed at early stage, the long-term survival of tumors increases and the cure rate is improved. The current medical level can only improve the tumor cure rate through early diagnosis. 2.Tumors that can be cured through comprehensive treatment The book of internal medicine oncology edited by academician Sun Yan listed several tumors that can be cured through internal medicine treatment: lymphoma, testicular tumor, trophoblastic tumor, certain childhood tumors and leukemia. Some of the tumors that can survive long term with early diagnosis are prostate cancer, breast cancer, and even early stage I lung cancer, where more than 90% can survive 5 years with surgical treatment, and these patients are also considered cured. Most malignant tumors will recur and metastasize after treatment and lead to patient death. Despite the emergence of a large number of new drugs and technologies concerning tumor treatment in recent decades, such as new chemotherapy drugs, newly popular molecular targeted drugs, stereotactic radiotherapy, conformal intensity modulated radiotherapy, etc., which appeared in the 1990s, however, the survival of several common tumors in the middle and late stages of comprehensive treatment has not been substantially improved. Not to mention China, European and American countries spend billions of dollars on cancer research every year, and countless researchers have worked hard, but how can we not overcome it? There is only one answer: the human body is too complex, and the development of tumor is a multifactorial and multi-step evolutionary process. From the completion of human genetic mapping project in 2003 to the identification of hundreds of genes related to cancer development, it is still a mystery who is the final regulator of tumor development in this complex network system, which is the reason why there are a lot of molecular targeted drugs, but the efficacy is always very little. In the battle against cancer, mankind seems to have discovered only the tip of the iceberg, and the biggest obstacle may still lie deep in the sea. During his time in office, President Richard Nixon, whose mother had breast cancer, vowed to accomplish two projects: one was to land a man on the moon, and the other was to conquer cancer. He therefore invested a lot of material and financial resources. Now it has been 41 years since man landed on the moon, and cancer is still rampant in the world. How far is the cure for cancer from us? I think it must not be a short process! In front of cancer, mankind looks so pale and powerless!!!