- Compare engraftment, long-term hematopoietic recovery, rate of GVHD, rate of relapse, toxicity rates, overall disease-free survival and overall survival when donor leukocyte infusions (DLI) are given for patients who have disease recurrence, progression, or low donor chimerisms after unrelated stem cell transplantation or before DLI with historical controls of other donor leukocyte infusions.