Freezing the graft is not necessary for autotransplants for plasma cell myeloma and lymphomas

We studied rates of granulocyte and platelets recovery in 359 consecutive subjects receiving blood cell infusions in the context of autotransplants for plasma cell myeloma (N= 216) and lymphomas (N= 143). Blood cells were mobilised with filgrastim given for 4-5 days and collected after a median of 2 (range, 1-2) apheresis. Apheresis products were stored at 4 degrees C for a median of 3 days (range, 2-6 days). Most subjects received carmustine, etoposide, cytarabine and melphalan (BEAM), cyclophosphamide, carmustine and etoposide (CBV) or high-dose melphalan. Filgrastim was given post transplant to 319 subjects. Median numbers of mononuclear cells collected was 31 x 10E + 6/kg (interquartile range (IQR) 37 x 10E + 6 cells/kg). Median numbers of CD34-positive cells collected was 3.6 x 10E + 6/kg (IQR 3.8 x 10E + 6/1(g). Median viability after collection was 90% (IQR 7%) after storage, 88% (IQR 12%). A total of 255 of 256 evaluable subjects recovered bone marrow function and there was no late bone marrow failure. Median interval to neutrophils >0.5 x E 9/L was 13 days (range, 9-39 days) and to platelets >20 x 10E + 9/L, 16 days (range, 7-83 days). These rates and ranges seem comparable to those reported after autotransplants of frozen blood cells. There was no correlation between numbers of storage days at 4 degrees C and viability afte storage (r = -0.018, p = 0.14)) nor rates of recovery of neutrophils (r = -0.054, p = 0.52) or platelets (r = 0.116, p = 0.14). Blood cells collected for autotransplant can be stored at 4 degrees C for 6 d. This method is simple, inexpensive and widely applicable.