850 patients were treated in hematology department of Municipal Clinical Hospital №16 in 2018. 85% of them were oncohematological patients. Medicine in the field of Hematology has reached a new level; and the term "doom" is absent now. Patients with hematological diseases were called "unpromising" twenty or thirty years ago. Now physicians are trying to bring every patient to recovery. However, you shouldn’t forget that the result will be effective when the diagnosis and treatment will be made at the initial stage of the disease.