The article provides grounds for a new, expanded definition of a concept «population hematology». It is not only a hematological subsection of the traditional population and epidemiological medicine. It is focused on patients populations as its primary object; however, its uniqueness is in the fact that its primary object is the nested population hierarchy, such as blood cells, cell clones and human groups. The heterogeneity of the samples and changes in the heterogeneity with the course of time are most important. Taking into account the time factor, staging, and long-term observation are unique characteristics of the population hematology methodology. Mechanism of population formation, leaving, and changes in its composition significantly affect the analysis of clinical and population study findings. The peculiarity of this field of medical knowledge is interaction, overlapping of target populations. Donor-recipient, patient-doctor, blood cells-body, virus-carrier-host, blood component-sample, donor-recipient sample, etc. - these are only some of alive and lifeless study objects which may undergo a thorough study. Despite the complexity and various natures of hematological populations, they have common characteristics. Therefore, a common methodology and tools for study designing, collection of experimental data, modeling, and analysis can be developed.

Актуальность. Успехи в терапии рецидивов и рефрактерного острого лимфобластного лейкоза (Р/Р ОЛЛ) в последние годы связаны с внедрением методов иммунотерапии, в т. ч. биспецифического активатора собственных T-клеток пациента блинатумомаба (Блинцито™, Амджен ®) (БЦ). Цель. Оценить эффективность и токсичность БЦ в лечении пациентов с Р/Р ОЛЛ и с персистенцией минимального опухолевого клона до и после трансплантации аллогенных гемопоэтических стволовых клеток (аллоТГСК). Материалы и методы. В исследование включено 66 больных В-ОЛЛ CD19+ в возрасте 18-72 лет, из них LYMPHOID TUMORS

The article provides a literature review on the use of the L-asparaginase (ASP) in acute lymphoblastic leukemia (ALL) and describes two clinical cases. During the treatment with ASP as part of remission induction therapy thrombotic and hemorrhagic complications in the central nervous system were registered. In both cases these complications were associated with reduced plasma levels of antithrombin III (АТ), hypofibrinogenemia and thrombocytopenia. The risk factors for thrombohemorrhagic complications in ALL patients during ASP treatment are reviewed including combined ASP + anthracycline therapy, oral contraceptives, glucocorticosteroids, thrombophilia and the presence of central venous catheter (CVC). Possible mechanisms of thrombosis as well as the timing of its occurrence and possible localisation are discussed. The article considers different strategies for prevention and treatment of thrombotic and hemorrhagic complications in ALL patients receiving ASP. In all ALL patients receiving ASP plasma levels of fibrinogen and AT should be assessed before treatment initiation, on day 3 after the injection and further every 5 to 7 days within a period of 3 weeks after the injection. Novel oral anticoagulants are not dependent on blood AT levels and may be used for prevention and treatment of thrombotic and hemorrhagic complications associated with ASP intake. Finally, recommendations for the correction of AT levels and hypofibrinogenemia are given.