TRANSPLANTATION OF ALLOGENEIC PERIPHERAL-BLOOD STEM-CELLS

Recombinant G-CSF has been given to over 150 normal donors for the col lection of allogeneic or syngeneic peripheral blood stem cells (PBSCs) , G-CSF was found to be well-tolerated with mild-moderate bone pain, e dema and mild thrombocytopenia being the observed side effects. To dat e, approximately 100 unmodified primary PBSC transplants from HLA-iden tical related donors have been performed with engraftment that is, in general, considerably more rapid than marrow, Acute g-raft-versus-host -disease (GVHD) grades II - IV occurred in 44% of patients and grades III - IV in 16%. From a small number of evaluable patients surviving f or more than 100 days, it appears the incidence of chronic GVHD is app roximately 50%, Despite the infusion of one to two logs more T cells, these results are not remarkably different than would be expected with marrow transplantation. Further studies are needed to define the role of allogeneic PBSCs for transplantation, to refine PBSC mobilization and collection techniques, and to evaluate the long-term effects of cy tokines in normal donors.