Alloreactive NK Cells for Allogeneic Stem Cell Transplantation for Acute Myeloid Leukemia (AML) and Myelodysplastic Syndrome (MDS)

Inclusion Criteria:

1. Patients with age \</= 70 years with one of of the following: Acute myeloid leukemia past first remission, in first or subsequent relapse, in second or greater remission or primary induction failure; Myelodysplastic syndromes with intermediate or high risk IPSS score; CML which has progressed to accelerated phase or blast crisis despite imatinib treatment
2. Patients must have an HLA matched (HLA A, B, C, DR) related or unrelated donor willing to donate for allogeneic peripheral blood progenitor cell transplantation. (Recent large analyses of the National Marrow Donor Program indicate that a mis-match at the DQ locus has no adverse effect on outcome. The current national standard of care is to consider only these 4 loci in identifying suitably "matched" donors.)
3. Patients must have a haploidentical relative who is predicted to be alloreactive based upon the presence of the relevant KIR genes and incompatibility with the recipient for HLA C and Bw antigens.
4. Zubrod performance status \</= 2.
5. Left ventricular ejection fraction \>/= 45%. No uncontrolled arrhythmias or uncontrolled symptomatic cardiac disease.
6. No symptomatic pulmonary disease. forced expiratory volume at one second (FEV1), forced vital capacity (FVC) and diffusing capacity of lung for carbon monoxide (DLCO) \>/= 50% of expected, corrected for hemoglobin.
7. Serum creatinine \</= 1.8mg%.
8. Serum glutamate pyruvate transaminase (SGPT) \</= 200 IU/ml unless related to patients malignancy.
9. Bilirubin \</= 1.5 mg/dl (unless Gilbert's syndrome).No evidence of chronic active hepatitis or cirrhosis. If positive hepatitis serology, discuss with Study Chairman and consider liver biopsy.
10. Patient or patient's legal representative, parent(s) or guardian able to sign informed consent.
11. No known allergy to mouse proteins or monoclonal antibodies

Exclusion Criteria:

1. Uncontrolled infection, not responding to appropriate antimicrobial agents after seven days of therapy. The Protocol PI is the final arbiter of eligibility.
2. Pleural/pericardial effusion or ascites estimated to be \>1L.
3. HIV-positive.
4. Pregnancy: Positive Beta Human Chorionic Gonadotropin (HCG) test in a woman with child bearing potential defined as not post-menopausal for 12 months or no previous surgical sterilization.
5. Known allergy to mouse proteins.
6. Patient has received other systemic chemotherapeutic drugs (including Mylotarg) within 14 days prior to trial enrollment or has unresolved grade \>1 toxicity from prior chemotherapy treatment. (Hydroxyurea or low dose ara-c less than or equal to 20 mg/m2/d is permitted if indicated to control induction refractory disease, and IT chemotherapy is allowed if indicated as maintenance treatment for previously diagnosed lumbar microdiscectomy (LMD), that is in remission prior to enrollment on this study).