Experimental and clinical data suggest that alloreactive NK cells can reduce the risk of graft-rejection, GvHD and leukemic relapse after HLA-mismatched transplantation. The effectiveness of allogeneic NK cells is a function of HLA-differences between donor and recipient that give rise to NK cell clones which do not express inhibitory receptors matching for the HLA molecules of the recipient. Aim of the study is to evaluate cellular therapy with alloreactive, IL-2 activated NK cells after transplantation of T-cell depleted stem cell grafts from one haplotype mismatched family donors in patients with hematological malignancies.

Inclusion Criteria:

• Patients with AML or ALL in first CR with the following high risk features:

  1. AML with aberration Del (5q) -5, del (7q) -7, t(9;22) or t(6;9), abn 3q, 9q, 11q, 20q, 21q, 17p;
  2. AML with a complex caryotype;
  3. secondary AML after previous chemo- or radiotherapy or MDS;
  4. Ph-positive ALL

• Patients with AML or ALL after induction failure or in second CR

• Patients with CML in second chronic or accelerated phase

• Patients with malignant Lymphoma and the following high risk features:

  1. relapse after autologous transplantation
  2. primary chemotherapy refractory disease

• All patients must fulfill the following criteria:

  1. lack of a suitable HLA-identical family, unrelated or cord blood donor
  2. no active infection, no severe impairment of cardial, pulmonary, renal and hepatic function
  3. blast count in the marrow < 30%
  4. informed consent

Exclusion Criteria:

• active infection, no severe impairment of cardial, pulmonary, renal and hepatic function
• blast count in the marrow > 30%
• unable or unwilling to sign and/or understand informed consent