Patients with Non Hodgkin-lymphoma undergoing stem cell mobilization for planned high-dose therapy will be treated with two cycles of chemotherapy (etoposide, ifosfamide, cisplatin, epirubicin), either followed by daily administration of filgrastim (first cycle) or pegfilgrastim (once after the second cycle). The number of circulating cluster of differentiation 34+ cells, colony-forming units and primitive progenitors will be analyzed at corresponding time points. Peripheral blood stem cells will be collected after the second cycle of chemotherapy by leukapheresis. After the second cycle, high-dose therapy with peripheral blood stem cell support will be administered (the protocol will be chosen according to the diagnosis, including total body irradiation-containing regimens).
