1.What are the factors of the development of leukemia? (1) Food contamination. For example, some food does not meet hygiene standards, fruits and vegetables residual pesticides. (2) Decoration pollution. It has been proved that the benzene and other harmful gases in the decoration materials are associated with the onset of leukemia. (3) Others suffer from water and air pollution, drug abuse, genetic defects, pregnant women discharged with harmful substances, inappropriate drug treatment, radiation screening, inadequate nutritional intake, etc. Therefore prevention of leukemia should start with diet and living. Pregnant women and children should try to stay away from harmful environments, advocate eating food that meets hygiene standards, choose harmless decoration materials when decorating homes, and open windows sufficiently before moving in, etc. Particular attention should be paid to the use of medication under the guidance of a doctor. 2. How to prevent leukemia? Children are a high incidence of leukemia, the reason, in addition to the weaker immune function of children, the harmful substances emitted from indoor decoration materials, improper medication, excessive preservatives in food, a large number of pesticides remaining on vegetables, fish, poultry, meat and eggs in the drug are factors that can not be ignored. The following suggestions are made on how to prevent leukemia: (1) Proper exercise: Let children do more outdoor exercise when the air is fresh to enhance their immune system. (2) Moderate diet: usually do a reasonable diet in terms of diet to prevent the appearance of acidic substances that endanger children’s health. (3) Keep away from pollution: Reduce the time children spend in polluted environments. (4) Reasonable medication: children should pay attention to the safety of medication when they are sick, and should not use medication without permission. (5) Pay attention to hygiene: children should eat less processed food, vegetables and fruits should be cleaned before consumption, and those that can be peeled should be peeled as much as possible. (6) Be alert to diseases: Parents should immediately take their children to a hospital hematologist for examination if they find symptoms such as anemia, weakness, pallor, unexplained fever, bleeding, etc. 3. Is the best treatment for leukemia a bone marrow transplant? At present, the treatment of childhood leukemia is mainly based on chemotherapy and intrathecal drug injection. The progress of treatment is mainly in the strategy of treatment. Emphasis is placed on high-dose, combined, sequential therapy, stratified treatment based on different risk levels, and standardized treatment under micro residual disease monitoring based on strict standardized MICM staging. Bone marrow transplantation is necessary only for those few children with high-risk acute leukemia, chronic granulocytic leukemia, recurrent episodes or failure to remit. The risk of bone marrow transplantation has been greatly reduced and the success rate for children with suitable donors can be over 90%. The problem of donor sources for only children is being solved by expanding the blood stem cell bank and conducting cord blood transplants. Some hospitals have also developed a semi-compatible transplantation method with parents as donors to treat childhood leukemia, opening a new way to cure childhood leukemia.