Arsenic Trioxide and Gemtuzumab Ozogamicin in Treating Patients With Advanced Myelodysplastic Syndromes

RATIONALE: Drugs used in chemotherapy, such as arsenic trioxide and gemtuzumab ozogamicin, work in different ways to stop the growth of cancer cells, either by killing the cells or by stopping them from dividing. Giving more than one drug (combination chemotherapy) may kill more cancer cells.

PURPOSE: This phase II trial is studying how well giving arsenic trioxide together with gemtuzumab ozogamicin works in treating patients with advanced myelodysplastic syndromes.

OBJECTIVES:

Primary

• Determine the efficacy of arsenic trioxide and gemtuzumab ozogamicin to achieve complete and partial remissions in patients with advanced myelodysplastic syndromes.

Secondary

• Determine the efficacy of this regimen, in terms of 50% decrease in RBC transfusion requirements and change in hemoglobin concentration from baseline in patients treated with this regimen.
• Determine the platelet, neutrophil, bone marrow, and cytogenic response in patients treated with this regimen.
• Determine the response duration in patients treated with this regimen.
• Determine the quality of life of patients treated with this regimen.
• Determine the safety and toxicity of this regimen in these patients.

OUTLINE: This is a multicenter, open-label study.

Patients receive arsenic trioxide IV over 1 hour once daily on days 1-5 in week 1 and then twice weekly in weeks 2-12. They also receive gemtuzumab ozogamicin IV over 2 hours on day 8. Treatment repeats every 12 weeks for up to 2 courses in the absence of disease progression or unacceptable toxicity.

Quality of life is assessed at baseline, every 12 weeks during study treatment, and then 4 weeks after the completion of study treatment.

After completion of study treatment, patients are followed periodically.

PROJECTED ACCRUAL: A total of 40 patients will be accrued for this study.

• Leukemia
• Myelodysplastic Syndromes

• Drug: arsenic trioxide
  Arsenic trioxide will be administered at a dose of 0.25 mg/kg/day IV over 1-2 hours for 5 consecutive days during the first week. Subsequently, arsenic trioxide will be given at a dose of 0.25mg/kg/day twice a week for 11 additional weeks (weeks 2-12).
  Other Name: Trisenox
• Drug: gemtuzumab ozogamicin
  Gemtuzumab ozogamicin consists of a 2 hr infusion at a dose of 3mg/m2 on day 8 of each 12-week cycle. Gemtuzumab ozogamicin should be administered at a minimum of one hour after the completion of the aresenic trioxide infustion
  Other Name: Mylotarg

DISEASE CHARACTERISTICS:

• Diagnosis of one of the following hematologic malignancies:

  • Myelodysplastic syndromes (MDS) of one of the following FAB classifications:

    • Refractory anemia with excess blasts (RAEB) (WHO RAEB-1)
    • RAEB in transformation (RAEB-t) (RAEB-2)
    • Chronic myelomonocytic leukemia (CMML) with > 5% myeloblasts (WHO CMML-2)
  • IPSS score of intermediate-2 or higher in the setting of > 5% myeloblasts
  • Acute myeloid leukemia that has evolved from MDS
• Must not be a candidate for bone marrow transplantation as first-line therapy or must have declined bone marrow transplantation

PATIENT CHARACTERISTICS:

• ECOG performance status of 0, 1, or 2
• Life expectancy of at least 4 months
• Serum potassium ≥ 4.0 mEq/dL and serum magnesium ≥ 1.8 mg/dL (supplemental electrolytes allowed)
• Absolute QTc interval < 460 msec
• No serious medical condition, laboratory abnormality, or psychiatric illness that, in the view of the treating physician, would place the patient at an unacceptable risk if he or she were to participate in the study or would prevent that person from giving informed consent
• Not pregnant or nursing
• Fertile patients must be willing to use adequate contraception (barrier method with spermicidal jelly, IUD, or oral contraceptives)
• Negative pregnancy test
• Creatinine > 2.5 mg/dL
• SGOT or SGPT > 1.5 times upper limit of normal
• Bilirubin > 2.0 mg/dL
• No history of malignancy within the past 3 years other than MDS except basal cell or squamous cell carcinoma of the skin or carcinoma in situ of the cervix or breast
• Arsenic trioxide is contraindicated in patients who are hypersensitive to arsenic

PRIOR CONCURRENT THERAPY:

• No prior bone marrow transplantation
• Must not receive another investigational or approved therapy for MDS within 4 weeks of study enrollment, including growth factors (within 1 week of study enrollment)
• No prior arsenic trioxide or gemtuzumab ozogamicin
• No other concurrent cytotoxic drugs or investigational agents