Safety Trial of NK DLI From 6/6 HLA Matched Family Member Following Nonmyeloablative ASCT

The cells from leukapheresis will be natural killer (NK) cell selected using a CD56 antibody and a cell column system provided by Miltenyi Biotec. The target cell dose for each NK cell infusion will be up to 1 X 10(7) CD56+ cells/kg patient weight with less than 0.5 X 10(6) CD3+ cells/kg patient weight. The first NK cell infusion will be administered 6 weeks post transplant in patients who have ≤ grade II acute graft versus host disease (aGVHD) at the time of infusion. Patients will be evaluated for toxicity and response until 20 weeks after the last NK Infusion.

Apheresis repeated daily up to 3 days until target dose of cells reached (preferably without donor receiving growth factors). Cells were transfused immediately after collection and processing. If collections occurred during initial mobilization at the time of stem cell transplant, the donor was off growth factor for \>24 hours. These extra cell collections from the donor were sufficient for the natural killer cells used in the trial. The cells were NK selected using a CD56 antibody (CliniMACS CD56 Reagent), CliniMACSplus instrument and CliniMACS tubing set provided by Miltenyi Biotec using the company protocol (Miltenyi Biotec Inc, Auburn, California). Pre and post processing cell count, viability, Hematopoietic Progenitor Cell Assay (HPCA) and flow analysis were done.