Clofarabine and High-Dose Melphalan Followed by Donor Stem Cell Transplant in Patients With Acute Myeloid Leukemia, Acute Lymphocytic Leukemia, or Myelodysplastic Syndromes

Leukemia Clinical Trial

Official title: A Phase I Study of Clofarabine Plus High Dose Melphalan as a Conditioning Regimen for Allogeneic Transplantation

Status Completed

Clinical Trial Summary

RATIONALE: Giving chemotherapy, such as clofarabine and melphalan, before a donor stem cell transplant helps stop the growth of cancer or abnormal cells. It also helps stop the patient's immune system from rejecting the donor's stem cells. When the healthy stem cells from a donor are infused into the patient, they may help the patient's bone marrow make stem cells, red blood cells, white blood cells, and platelets. Sometimes the transplanted cells from a donor can make an immune response against the body's normal cells. Giving cyclosporine and mycophenolate mofetil after the transplant may stop this from happening. PURPOSE: This phase I trial is studying the side effects and best dose of clofarabine when given together with high-dose melphalan followed by a donor stem cell transplant in treating patients with acute myeloid leukemia, acute lymphocytic leukemia, or myelodysplastic syndromes.

Clinical Trial Description

OBJECTIVES: - To determine the maximum tolerated dose and toxicities of clofarabine when administered with high-dose melphalan as a conditioning regimen in patients undergoing allogeneic stem cell transplantation for acute myeloid leukemia, acute lymphocytic leukemia, or myelodysplastic syndromes. - To assess the efficacy of this regimen in facilitating engraftment in these patients. - To perform correlative laboratory studies of engraftment, immune reconstitution, and therapeutic outcomes. OUTLINE: This is a dose-escalation study of clofarabine. Patients are stratified according to age (< 18 years vs ≥ 18 years). - Reduced-intensity conditioning regimen: Patients receive clofarabine IV over 30 minutes on days -9 to -5 and high-dose melphalan IV over 30 minutes on day -4. Cohorts of 3-6 patients receive escalating doses of clofarabine until the maximum tolerated dose (MTD) is determined. The MTD is defined as the dose preceding that at which 2 of 3 or 2 of 6 patients experience dose-limiting toxicity. At least 6 patients are treated at the MTD. - Allogeneic stem cell transplantation: Patients undergo allogeneic stem cell transplantation on day 0. - Graft-versus-host disease (GVHD) prophylaxis: Patients receive cyclosporine IV over 10 hours or orally twice daily beginning on day -1 and continuing until day 90-100, followed by a taper in the absence of GVHD. Patients also receive mycophenolate mofetil IV or orally twice daily beginning on day 0 and continuing until day 28, followed by a taper in the absence of GVHD. Patients undergo blood and/or bone marrow sample collection periodically for correlative laboratory studies. Samples are examined for markers of immune reconstitution (i.e., CD8+ T lymphocytes, CD4+ T lymphocytes, NK cells, B cells, and monocytes) by flow cytometry and for diversity of the reconstituted T-cell repertoire by PCR-based T-cell receptor repertoire analysis. Samples are also examined for gene expression of hRRM2 and markers of apoptosis (i.e., Bcl-2, Bid, NFkB2, and Bcl-3) by real-time RT-PCR and for markers of ribonucleotide reductase inhibition (i.e., dCTP levels in circulating peripheral blood mononuclear cells). After completion of study therapy, patients are followed periodically for up to 5 years. ;

Related Conditions & MeSH terms

• Leukemia
• Myelodysplastic Syndromes
• Preleukemia
• Syndrome

• NCT number: NCT00641030
• Study type: Interventional
• Source: City of Hope Medical Center
• Status: Completed
• Phase: Phase 1
• Start date: July 2007
• Completion date: January 2011