On November 8 eminent guests Alexander G. Rumyantsev MD, PhD,  Academician of the Russian Academy of Sciences, Honorary Professor of Hematology, Oncology and Radiation Therapy Departments, the founder and the president of Dmitry Rogachev National Research Center of Pediatric Hematology, Oncology and Immunology and the head of blood bank of the center Pavel Trakhtmanin visited Hematology center after prof.R.H Yeolyan. Pavel Trakhtmanin prepared informative and interesting lecture for the doctors and clinicians of the center concerning the transfusion of blood components. During the lecture, doctors discussed a number of current issues and innovative approaches of the field and the future prospects of education for clinical residents.