Safety Trial of NK Cell DLI 3-5/6 Family Member Following Nonmyeloablative ASCT

NK Cell infusion using CD56 monoclonal antibody following nonmyeloablative SCT from mismatched donors: The cells from leukapheresis will be NK 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 aGVHD at the time of infusion. Patients will be evaluated for toxicity and response until 20 weeks after the last NK Infusion.