I. Understanding Cancer 1. The current incidence of cancer in the world: In 2008, 12.7 million people worldwide suffered from cancer and 7.6 million died. 2. The current incidence of cancer in China: In the past 30 years, the number of cancer cases per year was about 2.6 million and 1.8 million deaths. 3.Types of cancer: There are about 200 kinds of cancers at present, including liver cancer, lung cancer, stomach cancer, cervical cancer, esophageal cancer, breast cancer and so on. 4.Cancer occurrence includes two stages: initiation stage and promotion stage. 5.Tumor spread: direct spread, lymphatic metastasis, hematogenous metastasis, implantation metastasis. Tumor staging: TNM staging method. Cancer prevention: tertiary prevention. Cancer-causing factors include chemical factors, physical factors, biological factors, genetic factors and so on. What are the methods of tumor diagnosis? 1.Laboratory examination: shedding cells, tumor markers, immune function monitoring examination, 2.Endoscopic examination: tracheoscopy, gastroscopy, enteroscopy, cystoscopy, colposcopy, hysteroscopy. 3.Imaging examination: ultrasonography, X-ray, CT, MRI 4.Pathological examination 4.What are the tumor treatment methods? 1.Surgical treatment: palliative surgery, radical surgery. 2.Radiation therapy: including external irradiation, intracavitary irradiation, inter-tissue irradiation, r-knife, X-knife. 3.Heat therapy: applicable to superficial tumors, combined with radiotherapy. 4.Chemotherapy: most tumors are suitable for chemotherapy. 5.Biotherapy: biological agents. 6.Targeted therapy: Gefitinib, Erlotinib, Imatinib and so on. Endocrine therapy: breast cancer, prostate cancer, ovarian cancer and so on. 8.Chinese medicine treatment: supportive and supportive treatment. V. What is cancer? Simply speaking, cancer is a new organism formed by abnormal proliferation of local tissues under the action of various carcinogenic factors. VI. Why do people get tumors? Mutations occur in DNA during the process of replication, which is beneficial to the evolution of species. Therefore, it is inevitable that errors occur during the process of replication and tumors are produced due to gene mutations. This is the price that human evolution is bound to pay.