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Moxetumomab Pasudotox for Advanced Hairy Cell Leukemia

This study is ongoing, but not recruiting participants.
Information provided by (Responsible Party):
MedImmune LLC Identifier:
First received: April 9, 2013
Last updated: March 30, 2017
Last verified: March 2017


- Moxetumomab pasudotox is an experimental non-chemotherapy cancer treatment drug. It targets CD22, a molecule on the surface of essentially all hairy cell leukemia cells. Moxetumomab pasudotox binds to CD22, goes into the cell, and releases a toxin which kills the cell. In a phase I trial it had activity in relapsed/refractory hairy cell leukemia with safety profile supporting further clinical study ( This is a phase III multicenter trial designed to confirm these results.

Condition Intervention Phase
Leukemia, Hairy Cell
Drug: moxetumomab pasudotox
Drug: IV Bag Protectant for Moxetumomab pasudotox
Phase 3

Study Type: Interventional
Study Design: Intervention Model: Single Group Assignment
Masking: No masking
Primary Purpose: Treatment
Official Title: A Pivotal Multicenter Trial of Moxetumomab Pasudotox in Relapsed/ Refractory Hairy Cell Leukemia

Resource links provided by NLM:

Further study details as provided by MedImmune LLC:

Primary Outcome Measures:
  • Rate of CR in patients treated with study drug [ Time Frame: Every 4 weeks ]

Secondary Outcome Measures:
  • Overall response rate [ Time Frame: every 4 weeks. ]
  • Relapse free survival [ Time Frame: Once patients have a Complete Response (CR), they will be followed with monthly blood work for 6 months then every 3 months for 2 years, then yearly thereafter. Bone marrow examinations at 6 months. ]
  • Progression free survival [ Time Frame: Once patients have a Complete Response (CR), they will be followed with monthly blood work for 6 months then every 3 months for 2 years, then yearly thereafter. Bone marrow examinations at 6 months. ]
  • Time to Response [ Time Frame: Duration of Study ]
    TTR will be measured from start of administartion to the first documentation of response (CR or PR)

  • Safety [ Time Frame: 1st Administration through 30 Days after Last Dose ]
    Occurence of AEs, abnormal laboratory values, and SAEs reported from 1st administration of moxetumomab pasudotox through 30 days after last dose

  • Pharmacokinetic [ Time Frame: Duration of Treatment ]
  • Immunogenic Potential [ Time Frame: Duration of Treatment ]

Enrollment: 89
Actual Study Start Date: April 29, 2013
Estimated Study Completion Date: May 17, 2017
Estimated Primary Completion Date: May 17, 2017 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Arm A
Patients will receive Moxetumomab Pasudotox IV over 30 minutes on days 1, 3, 5 of each 28 day cycle for a maximum of 6 cycles or until disease progression, unacceptable toxivity, initiation of alternate therapy or documented CR.
Drug: moxetumomab pasudotox Drug: IV Bag Protectant for Moxetumomab pasudotox

Detailed Description:


  • Hairy cell leukemia is an indolent B-cell leukemia comprising 2% of all leukemias, or approximately 900 of the 44,000 new cases of leukemia/year in the US
  • Over the last two decades, immunotoxin research has accumulated to support a role for CD22-targeted therapy in the treatment of HCL.
  • Moxetumomab pasudotox is a recombinant immunotoxin containing an Fv fragment of an anti-CD22 monoclonal antibody and truncated Pseudomonas exotoxin.
  • Moxetumomab pasudotox has demonstrated a high complete response (CR) rate in patients with chemoresistant hairy cell leukemia (HCL) and has shown activity in pediatric acute lymphoblastic leukemia as well.
  • Modification of the structure of moxetumomab pasudotox has greatly improved binding and cytotoxicity toward CD22 expressing malignant cells compared to the precursor molecule. Preclinical and clinical studies have demonstrated that this increase in binding affinity results in improved antitumor activity and tolerability
  • Currently there are no approved agents with significant efficacy for HCL patients after failure of standard therapy


  • This is a multicenter, single-arm study of moxetumomab pasudotox in patients with relapsed/refractory hairy cell leukemia.
  • 77 patients will be enrolled to receive moxetumomab pasudotox IV on days 1, 3 and 5 of each 28 day cycle for a maximum of 6 cycles or until disease progression, unacceptable toxicity occurs, the subject begins alternate therapy, or documented CR (for subjects who have no assessable minimal residual disease and not to exceed 6 cycles). If less than or equal to 2 of the first 25 patients do not achieve durable CR, no additional patients will be accrued.
  • The overall IRB accrual ceiling is currently set at 80 to allow for a small number of patients that cannot be assessed for response.

Ages Eligible for Study:   Child, Adult, Senior
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
  • Patients must have histologically confirmed hairy cell leukemia or hairy cell leukemia variant .with a need for therapy
  • Patients must be Pseudomonas-immunotoxin naive
  • Patients must have had at least 2 prior purine analogs, or at least 1 course of purine analog and 1 of either rituximub or BRAF inhibitor.
  • Men or women age greater than or equal to 18 years.
  • ECOG performance status less than or equal to 2.
  • Patients must have adequate organ function


  • Patients who have had chemotherapy, immunotherapy or radiotherapy within 4 weeks prior to entering the study.
  • Patients who are receiving any other investigational agents.
  • Patients with known brain metastases should be excluded from this clinical trial
  • Patients with clinically significant ophthalmologic findings during screening
  • Pregnant or breastfeeding females.
  • Positive for Hepatitis B core antibody surface antigen unless the patient is on Lamivudine or Entecavir and Hepatitis B Viral DNA load is less than 2000 IU/mL.
  • Lymph nodes greater than 4cm or prior splenectomy
  • Active second malignancy requiring treatment other than minor resection of indolent cancers like basal cell and squamous skin cancers
  • HIV-positive patients unless taking appropriate anti-HIV medications with a CD4 count of greater than 200.
  • History of allogeneic bone marrow transplant.
  • Patients with history of both thromboembolism and known congenital hypercoagulable conditions.
  • Uncontrolled pulmonary infection, pulmonary edema.
  • Aequate oxygen saturation
  • Radioimmunotherapy within 2 years prior to enrollment in study.
  • Adequate hematologic function
  • Adequate lung function
  • Patients with history of thrombotic microangiopathy or TTP-HUS.
  • Patients with QTc interval (Federica) elevation > 500 msec based on at least 2 separate 12-lead ECGs
  • Patient on high dose estrogen
  • Patients with clinical evidence of disseminated intravascular coagulation
  Contacts and Locations
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, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT01829711

  Show 34 Study Locations
Sponsors and Collaborators
MedImmune LLC
Study Director: MedImmune LLC MedImmune LLC
  More Information

Additional Information:
Responsible Party: MedImmune LLC Identifier: NCT01829711     History of Changes
Other Study ID Numbers: 130106
13-C-0106 ( Other Identifier: CTEP )
CD-ON-CAT-8015-1053 ( Other Identifier: MedImmune )
Study First Received: April 9, 2013
Last Updated: March 30, 2017

Keywords provided by MedImmune LLC:
Moxetumomab Paudotox
anti-CD22 recombination immunotoxin
Biologic Therapy
Recombinant Immunotoxin
Monoclonal Antibody
Pseudomonas Exotoxin
Targeted Therapy

Additional relevant MeSH terms:
Leukemia, Hairy Cell
Neoplasms by Histologic Type
Lymphoproliferative Disorders
Lymphatic Diseases
Immunoproliferative Disorders
Immune System Diseases
Immunologic Factors
Physiological Effects of Drugs processed this record on May 23, 2017