Chemotherapy and Monoclonal Antibody Therapy in Treating Patients With Advanced Myeloid Cancer

OBJECTIVES:

- Determine the maximum tolerated dose of bismuth Bi 213 monoclonal antibody M195
following cytarabine in patients with advanced myeloid malignancies.

- Determine the antileukemic effects of this treatment in this patient population.

- Determine the toxicity of this treatment in this patient population.

- Determine the complete remission rate of patients treated with this treatment regimen.

OUTLINE: This is a dose escalation study of bismuth Bi 213 monoclonal antibody M195 (Bi213
MOAB M195).

Patients receive cytarabine IV continuously on days 1-5. Beginning between days 7 and 14,
patients receive Bi213 MOAB M195 IV over 5 minutes up to 4 times daily over 1-4 days.
Patient also receive filgrastim (G-CSF) subcutaneously daily beginning 24 hours after the
final Bi213 MOAB M195 infusion and continuing until blood counts recover. Treatment
continues in the absence of disease progression or unacceptable toxicity.

Cohorts of 3 to 6 patients receive escalating doses of Bi213 MOAB M195 until the maximum
tolerated dose (MTD) is determined. The MTD is defined as the dose at which 2 of 6 patients
experience dose-limiting toxicity. Once the MTD is determined, subsequent patients are
treated at the MTD.

Patients are followed twice weekly for 4 weeks and then monthly for 3 months.

DISEASE CHARACTERISTICS:

- One of the following diagnoses:

- Pathologically confirmed acute myeloid leukemia (AML) meeting one of the
following criteria:

- Newly diagnosed AML, over age 60, and not eligible for higher priority
protocols

- Newly diagnosed AML and unable to receive anthracycline-containing or
high-dose cytarabine-containing regimens

- AML in relapse

- AML refractory to two courses of standard induction chemotherapy or one
course of high-dose cytarabine-containing induction chemotherapy

- Chronic myelogenous leukemia in accelerated phase or myeloid blast crisis

- Refractory anemia with excess blasts (RAEB), RAEB in transformation, or chronic
myelomonocytic leukemia

- More than 25% of bone marrow blasts must be CD33 positive

- Not a candidate for immediate bone marrow transplantation with a HLA-compatible donor

- No active CNS leukemia

PATIENT CHARACTERISTICS:

Age:

- Not specified

Performance status:

- Karnofsky 60-100%

Life expectancy:

- Not specified

Hematopoietic:

- Not specified

Hepatic:

- Bilirubin no greater than 2 mg/dL (unless due to leukemia or Gilbert's disease)

- Alkaline phosphatase no greater than 2.5 times upper limit of normal (ULN)

- AST no greater than 2.5 times ULN

Renal:

- Creatinine less than 2 mg/dL OR

- Creatinine clearance greater than 60 mL/min

Cardiovascular:

- No New York Heart Association class III or IV cardiac disease

Pulmonary:

- No pulmonary disease

Other:

- No detectable antibodies to monoclonal antibody M195

- No serious active uncontrolled infection

- No other concurrent active malignancy requiring therapy

- No other serious or life-threatening conditions that would preclude study

- Not pregnant or nursing

- Negative pregnancy test

- Fertile patients must use effective contraception

PRIOR CONCURRENT THERAPY:

Biologic therapy:

- At least 3 weeks since prior biologic therapy and recovered

Chemotherapy:

- See Disease Characteristics

- Prior hydroxyurea allowed if discontinued before study treatment

- At least 3 weeks since other prior chemotherapy and recovered

Endocrine therapy:

- Not specified

Radiotherapy:

- At least 3 weeks since prior radiotherapy and recovered

Surgery:

- Not specified