This phase I trial studies the side effects and the best dose of deglycosylated ricin A chain-conjugated anti-cluster of differentiation (CD)19/anti-CD22 immunotoxins when given together with cytarabine in treating patients with B-cell acute lymphoblastic leukemia that has come back after a period of improvement (relapsed) or does not respond to treatment (refractory). Immunotoxins, such as deglycosylated ricin A chain-conjugated anti-CD19/anti-CD22 immunotoxins, can find certain cancer cells and kill them without harming normal cells. Drugs used in chemotherapy, such as cytarabine, work in different ways to stop the growth of cancer cells, either by killing the cells, by stopping them from dividing, or by stopping them from spreading. Giving deglycosylated ricin A chain-conjugated anti-CD19/anti-CD22 immunotoxins with cytarabine may kill more cancer cells.
PRIMARY OBJECTIVES: I. To define the maximum tolerated dose (MTD) of Combotox (deglycosylated ricin A chain-conjugated anti-CD19/anti-CD22 immunotoxins) when added to high-dose cytarabine during salvage therapy for adult patients with relapsed or refractory B-lineage acute lymphoblastic leukemia. SECONDARY OBJECTIVES: I. To evaluate the efficacy of this regimen. II. To assess for the presence of a postulated CD34+/CD38-/low/CD19+ leukemic stem cell phenotype in the bone marrow at time of relapse and to assess its association with treatment outcome. III. To determine the development of human mouse or ricin antibodies (human anti-mouse antibodies \[HAMA\]/human anti-ricin antibodies \[HARA\]). IV. To determine the pharmacokinetic characteristics of Combotox. V. To evaluate the value of fractional excretion of sodium (FeNa) as early marker of toxicity. OUTLINE: This is a dose-escalation study of deglycosylated ricin A chain-conjugated anti-CD19/anti-CD22 immunotoxins. Patients receive high-dose cytarabine intravenously (IV) over 2-3 hours every 12 hours on days 1-3 and deglycosylated ricin A chain-conjugated anti-CD19/anti-CD22 immunotoxins IV over 4 hours on days 8, 10, and 12. Treatment repeats every 28 days for up to 4 courses in the absence of disease progression or unacceptable toxicity. After completion of study treatment, patients are followed up for 12 weeks.
Study Type
INTERVENTIONAL
Allocation
NA
Purpose
TREATMENT
Masking
NONE
Enrollment
18
Albert Einstein College of Medicine
The Bronx, New York, United States
Fox Chase Cancer Center
Philadelphia, Pennsylvania, United States
Occurrence of dose-limiting toxicity, defined as grade 3 or greater non-hematological adverse event attributable to Combotox, graded per the National Cancer Institute Common Terminology Criteria for Adverse Events version 4.0
Time frame: Up to 28 days
Clinical response rate (response defined as complete response or partial response)
Descriptive statistics and tabular representations will be used to describe and evaluate the response rates for each dose level.
Time frame: Up to day 42
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