Result of attempted hematopoietic reconstitution using isologous, peripheral blood mononuclear cells: a case report.

In order to test the effect of peripheral blood mononuclear cell infusions on hematopoietic recovery in man we intensively leukapheresed a normal identical twin and obtained 9.8 x 10(10) peripheral blood mononuclear cells containing 4 x 10(5) CFU-C. These isologous cells were infused into his identical twin brother who had received 150 rad of total body irradiation and intensive combination chemotherapy as adjuvant therapy for Ewing's sarcoma. When compared to other patients receiving similar treatment, leukocyte recovery was accelerated by 3-4 wk, and occurred at a rate comparable to that induced by infusion of autologous cryopreserved marrow. Recovery of granulocytes, monocytes and platelets was not accelerated. The low number of CFU-C present in the preparation used ((one-eighth the number of CFU-C we usually obtain from bone marrow autograft collections) may have led to the pattern of hematopoietic recovery we observed in this patient.