Advantages of the Liposomal Form of Xymedon in Leukopoiesis Restoration against the Background of Myelosuppressive Therapy with Liposomal Antineoplastic Drugs in Experiment.

We analyzed advantages of the liposomal form of Xymedon (50 and 100 mg/kg) over free Xymedon (in the corresponding doses) in leukopoiesis restoration in rats with Walker-256 carcinoma treated with liposomal combination of doxorubicin (4 mg/kg) and cyclophosphamide (45 mg/kg) (single intravenous injection on day 11 after transplantation of tumor cells). Liposomal and free Xymedon were injected intravenously over 5 days starting from day 11 of the experiment. Changes in leukopoiesis in peripheral blood and myelograms were assessed on days 3 and 7 after chemotherapy. Liposomal Xymedon in both doses (unlike its free form) 2-fold increased the number of lymphocytes on day 3 after chemotherapy in comparison with the level observed after administration of liposomal cytostatics alone. Liposomal Xymedon in a dose of 50 mg/kg (but not 100 mg/kg) promoted the maintenance of monocyte count at the level of intact control on days 3 and 7 after chemotherapy. Liposomal Xymedon in a dose of 50 mg/kg and free Xymedon in a dose of 100 mg/kg equally stimulated the increase in myelocytes content in the bone marrow to the level of intact control on day 3 after chemotherapy, thus promoting restoration of granulocytopoiesis.