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Retreatment Protocol for BL22 Immunotherapy in Relapsed or Refractory Hairy Cell Leukemia

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00924040
Recruitment Status : Terminated (The supply of BL22 has expired and MedImmune the sponsor is not interested in producing any new supply.)
First Posted : June 18, 2009
Results First Posted : May 1, 2012
Last Update Posted : October 29, 2015
Information provided by (Responsible Party):
Robert Kreitman, M.D., National Institutes of Health Clinical Center (CC)

Brief Summary:

BL22 is a type of protein that scientists have created to interact with certain cancer cells. Experiments have shown that BL22 can bind with cancer cells that have a particular kind of protein (called CD22 ) on their surface, and can kill those cells. CD22 is present on certain types of hairy cell leukemia (HCL) cancer cells, and researchers have been working on treatments that will use BL22 and other related proteins to interact with and kill these kinds of cancer cells. The primary purpose of this study will be to provide access to and treatment with BL22 for patients who have HCL in order to determine their response to the treatment. In addition, the study will assess potential side effects of BL22 and examine why some patients respond better than others to treatment with BL22 and related therapies.

This study will include about 21 to 25 adults who have been diagnosed with forms of HCL that have not responded well to standard treatments such as surgery, chemotherapy, or radiation therapy. These adults also will have received anti-CD22 therapies before, potentially including treatments with BL22, and have not developed immunity or resistance to these treatments.

Prior to the study, patients will undergo a 1- to 2-week screening period to assess their eligibility for treatment. Eligible patients will participate in the study for up to 16 cycles of treatment, with each cycle lasting approximately 4 weeks. For each cycle, patients will receive 1 prescribed dose of BL22 every other day for a total of 3 doses per cycle, and will be assessed after every cycle to evaluate the success of the treatment. During the evaluation visits, patients will be required to have a brief physical examination, give blood and urine samples for testing, and undergo other tests as need to check heart and kidney function and assess the state of the leukemia. Patients who agree will give additional blood, urine, or bone marrow samples for future research purposes.

Condition or disease Intervention/treatment Phase
Hairy Cell Leukemia Drug: BL22 (CAT-3888) Phase 2

  Show Detailed Description

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 1 participants
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: Retreatment Protocol for BL22 Immunotherapy in Relapsed or Refractory Hairy Cell Leukemia
Study Start Date : February 2009
Actual Primary Completion Date : August 2010
Actual Study Completion Date : August 2010

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Leukemia

Arm Intervention/treatment
Experimental: BL22 Immunotherapy
30 micrograms/kg intravenous over 30 minutes every other day (QOD) on days 1, 3, 5, of a 4 week cycle (at least 26 days) for a maximum of 16 cycles or until they become ineligible.
Drug: BL22 (CAT-3888)
30 micrograms/kg intravenous over 30 minutes every other day (QOD) on days 1, 3, 5, of a 4 week cycle (at least 26 days) for a maximum of 16 cycles or until they become ineligible.

Primary Outcome Measures :
  1. Number of Months to Response to Treatment [ Time Frame: 2/14/2009 till 6/24/2010 ]
    Response is defined by the Response Evaluation Criteria in the protocol, namely the earliest point where all relevant tests (i.e. lab tests, physical exam, radiology results) are consistent with complete response (CR) or partial response (PR). CR or PR must be confirmed for at least 4 weeks. Complete response: No evidence of leukemic cells by routine H/E stains of the peripheral blood and bone marrow. Partial response:neutrophils >/= 1,500/micrograms/L or 50% improvement over baseline without growth factors for at least 4 weeks.

Secondary Outcome Measures :
  1. Number of Participants With Adverse Events [ Time Frame: 2 years & 6 months ]
    Here are the number of participants with adverse events. For the detailed list of adverse events see the adverse event module.

  2. Number of Participants With Complete Response (CR) Who Resolve the Bone Marrow Abnormality by Magnetic Resonance Imaging (MRI) [ Time Frame: Bone marrow biopsy and MRI 4 weeks after patients meeting blood criteria for CR, and if CR is present, repeat bone marrow biopsy and MRI every 12 months. Bone marrow biopsy and MRI is not done in patients with PR as best response. ]
    Patients are assessed by MRI to determine which ones resolve their marrow abnormality. A non-parametric Wilcoxon test was to be used to determine whether CR correlated with resolution of MRI abnormality

  3. Number of Patients Who Developed Neutralizing Antibodies After One or More Cycles of BL22 [ Time Frame: 24 weeks ]
    Fresh malignant cells are isolated from blood, bone marrow, lymph nodes or other tissue and incubated with recombinant immunotoxins to determine sensitivity to BL22 and other agents to estimate the amount of cancer cells in the body by measuring proteins which fall off cancer cells and go into the blood.

  4. Number of Patients With ex Vivo Sensitivity Who Respond Clinically [ Time Frame: Time to CR can be between 2 months and 1 year ]
    Although some hairy cell leukemia (HCL) cells from some patients may have ex vivo sensitivity, they might not respond clinically. Number of participants with pretreatment ex vivo sensitivity (<10 ng/ml IC50) who go on to achieve CR as best response. CR required abscence of HCL in the bone marrow and resolution of cytopenias.

  5. Percentage of Patients Who Respond Clinically, Who Also Have Normalization in sCD22 or sCD25 [ Time Frame: patients may undergo lymphapheresis before the first and/or later cycles up to 12 months after achieving CR or PR ]
    CD25 (sCD25)and CD22 (sCD22) quantify hairy cell leukemia (HCL) tumor burden. Patients with either PR or CR are evaluated for soluble forms of CD25 (sCD25) and soluble CD22 (sCD22). The number of patients with PR or CR who have normalization of sCD25 and sCD22 will be recorded. Normalization is considered <3 ng/ml for sCD25, and <2 ng/ml for sCD22. Patients will be assessed for normalization of sCD25 and sCD22 for at least 12 months after achieving PR or CR.

  6. Correlation Between Number of Prior Cycles of BL22 With Immunogenicity on This Protocol [ Time Frame: Within 2 months of end of treatment ( measure antibodies before each cycle) ]
    Percent of patients neutralizing >75% of 1000 ng/ml of BL22 in a biologic assay by end of treatment, with respect to the number of prior cycles of BL22 prior to entry on this protocol

  7. Percentage of Patients Who Make Antibodies [ Time Frame: 24 weeks ]
    Determination of antibodies against BL22 is determined by the Clinical Laboratory Improvement Amendments (CLIA) certified blood tests in our contract lab. NCI-Frederick in the laboratory of Dr. David Waters (Science Applications International Corporation (SAIC). He is CLIA certified.

  8. Percentage of Patients Who Have Dose Limiting Toxicity (DLT) [ Time Frame: 24 weeks ]
    Determination of dose limiting toxicity (DLT) is by the standard toxicity assessment Common Terminology Criteria for Adverse Events version 3.0 (CTCAEv3.0) done every cycle. For detailed information about the CTCAEv3.0 see the protocol Link module.

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

One of the following:

  1. Patients who previously received CAT-3888 and did not have unacceptable toxicity
  2. Patients who received CAT 8015 in study CAT 8015-1001 and have progression of disease or relapse. These patients must be considered off-study for CAT-8015 protocol specified follow-up

Patient must have histopathological evidence of HCL as confirmed by the Laboratory of Pathology, NCI.

At least one of the following indications for treatment:

  1. Neutropenia (absolute neutrophil count (ANC) less than 1000 cells/microL).
  2. Anemia (hemoglobin (Hgb) less than 10 g/dL).
  3. Thrombocytopenia (platelet (Plt) less than 100,000/microL).
  4. Absolute lymphocyte count of greater than 5000 cells/microL
  5. Symptomatic splenomegaly.
  6. Enlarging lymph nodes greater than 2cm.

Patient must have had at least 2 prior systemic therapies. There must have been at least 2 prior courses of purine analog, or 1 if the response to this course lasted less than 2 years, or if the patient had unacceptable toxicity to purine analog.

Patient must have Eastern Cooperative Oncology Group (ECOG) performance status of 0-2, unless due to potentially reversible active uncontrolled infection.

Patient must be greater than or equal to 18 years old.

Patient can understand and give informed consent.

Patient must have adequate liver and renal function, as defined by the following criteria:

  1. Alanine aminotransferase (ALT) and aspartate aminotransferase (AST) less than or equal to 2.5-times the upper limits of normal.
  2. Albumin greater than or equal to 3.0 g/dL.
  3. Total bilirubin less than or equal to 2.2 mg/dL.
  4. Creatinine less than or equal to 1.4 mg/dL or creatinine clearance greater than or equal to 50 mL/min.

Patient must agree to using adequate contraception (hormonal or barrier method of birth control; abstinence) prior to study entry and for the duration of the study.


Patients who are pregnant or nursing. A negative pregnancy test (urine or serum) must be documented within one week prior to starting BL22 in women of child-bearing potential.

Patient has developed antibody titer that neutralizes greater than 75% of the activity of 1 microg/mL of BL22 using a bioassay.

Patients who had systemic cytotoxic chemotherapy, immunotherapy, recombinant anti-CD22 immunotoxin (ie, CAT-8015, BL22, or LMB-2) or systemic steroid (with the exception of stable doses of Prednisone less than or equal to 20 mg/day) treatment within 4 weeks of enrollment. Patients receiving a limited number of doses (less than 5) of steroid for non-treatment reasons (eg, allergy prophylaxis connected with medical testing) may not receive any steroid within one week of enrollment and may not have had any evidence of disease response to steroid. Subjects who are receiving steroids for other conditions (e.g., autoimmune disorders) are eligible, as long as there is no increase in the dose or change in steroid type within 1 week of treatment. Subjects who are using a chronic steroid must wait for 4 weeks before starting the trial.

Patient had monoclonal antibody therapy (with the exception of BL22 or CAT-8015 or LMB-2) within 4 weeks of enrollment.

Patient is receiving any other investigational agent.

Uncontrolled intercurrent illness including, but not limited to, symptomatic congestive heart failure, unstable angina pectoris, cardiac arrhythmia, or psychiatric illness/social situations that would limit compliance with study requirements.

Patients who discontinued from CAT-8015 or BL22 studies due to toxicity or dose-limiting toxicity.

Dose limiting toxicity to CAT-8015

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00924040

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United States, Maryland
National Institutes of Health Clinical Center, 9000 Rockville Pike
Bethesda, Maryland, United States, 20892
Sponsors and Collaborators
National Cancer Institute (NCI)
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Principal Investigator: Robert J Kreitman, M.D. National Cancer Institute, National Institutes of Health

Additional Information:
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Responsible Party: Robert Kreitman, M.D., Principal Investigator, National Institutes of Health Clinical Center (CC) Identifier: NCT00924040     History of Changes
Obsolete Identifiers: NCT00850525
Other Study ID Numbers: 090076
First Posted: June 18, 2009    Key Record Dates
Results First Posted: May 1, 2012
Last Update Posted: October 29, 2015
Last Verified: October 2015

Keywords provided by Robert Kreitman, M.D., National Institutes of Health Clinical Center (CC):
BL22 in HCL after Immunotoxin
Hairy Cell Leukemia

Additional relevant MeSH terms:
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Leukemia, Hairy Cell
Neoplasms by Histologic Type
Lymphoproliferative Disorders
Lymphatic Diseases
Immunoproliferative Disorders
Immune System Diseases