- Patients whose related allotransplant donor is available, eligible and enrolled on this or another National Institutes of Health (NIH)/Clinical Center (CC) protocol that permits collection of a clinical donor lymphocyte cell product, and donors are first-degree relatives with genotypic identity at 5-6/6 human leukocyte antigen (HLA) loci (HLA- A, B, and DR. Haploidentical (less than 5/6 genotypic identity) allotransplant recipients will not be eligible, due to risk of severe GVHD with donor lymphocyte infusion (DLI).