Mesenchymal Stem Cells in the Treatment of Relapsed/Refractory Severe Acquired Aplastic Anemia

Mesenchymal Stem Cells in the Treatment of Relapsed/Refractory Severe Acquired Aplastic Anemia
This study is currently recruiting participants.
Verified February 2011 by University of Sao Paulo

First Received on February 16, 2011.  
No Changes Posted
Sponsor: University of Sao Paulo
Information provided by: University of Sao Paulo Identifier: NCT01297972

Mesenchymal stem cells have been tested in many autoimmune disorders with encouraging results and may be an alternative to the treatment of immune-mediated severe acquired aplastic anemia.

Condition Intervention Phase
Aplastic Anemia Biological: Intravenous bone marrow mesenchymal stem cells infusion Phase 1
Phase 2

Study Type: Interventional
Study Design: Endpoint Classification: Safety/Efficacy Study
Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Treatment
Official Title: Bone Marrow Mesenchymal Stem Cells in the Treatment of Refractory Severe Acquired Aplastic Anemia

Resource links provided by NLM:

Further study details as provided by University of Sao Paulo:

Primary Outcome Measures:

  • Number of Participants with Adverse Events as a Measure of Safety and Tolerability of intravenous allogeneic unrelated mesenchymal stem cells infusion in patients with severe acquired aplastic anemia. [ Time Frame: After the mesenchymal stem cells infusion up to 6 mounth after ] [ Designated as safety issue: Yes ]
    Adverse events like allergic reactions,infectious diseases,organ dysfunction or other related to mesenchymal stem cells infusion will be assessed.

Secondary Outcome Measures:

  • Level of cytopenias [ Time Frame: weekly until 6 months ] [ Designated as safety issue: No ]
  • Transfusional requirements [ Time Frame: weekly until 6 months ] [ Designated as safety issue: No ]
    Units of blood or platelets transfused after the mesenchymal stem cells infusion will be measured and compared to previously.

  • Incidence of infections and febrile neutropenia [ Time Frame: weekly until 6 months ] [ Designated as safety issue: No ]

Estimated Enrollment: 5
Study Start Date: February 2011
Estimated Study Completion Date: December 2011
Estimated Primary Completion Date: December 2011 (Final data collection date for primary outcome measure)
Intervention Details:

    Biological: Intravenous bone marrow mesenchymal stem cells infusion

    After standard immunosuppressive therapy with rabbit antithymocyte globulin 3,5 mg/Kg/day during 5 days, allogeneic unrelated bone marrow derived mesenchymal stem cells will be infused intravenously. Oral cyclosporine 5 mg/Kg/day (with dose correction weekly to keep serum cyclosporine level between 150-250 mg/dl) up to 6 months will be added.

Detailed Description:

Acquired aplastic anemia is a bone marrow failure syndrome characterized by and empty bone marrow and low blood counts. Most of the cases are immune-mediated. Allogeneic bone marrow transplant is the preferable treatment modality for patients younger than 40 years with a matched sibling donor. Patients not eligible for transplant are treated with intensive immunosuppressive therapy often based on anti-thymocyte globulin and cyclosporine.

However, up to one third of patients treated with immunosuppression are refractory and one third of those who response eventually relapse. Refractory and relapsed cases may be the result of insufficient immunosuppression and these cases may benefit from additional immunosuppression. Mesenchymal stem cells infusion may be a potential treatment option, considering its properties to modulate the immune system.

Refractory or relapsed patients with aplastic anemia will be treated with conventional immunosuppressive regimen (anti-thymocyte globulin plus cyclosporine) combined with intravenous infusion of allogeneic unrelated bone marrow mesenchymal stem cells.


Ages Eligible for Study:   18 Years to 65 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Diagnosis of Acquired Aplastic Anemia
  • Relapse/refractory to at least 1 immunosuppressive first line treatment
  • Not eligible to allogeneic bone marrow transplantation

Exclusion Criteria:

  • Previous or current malignancy
  • Active or latent infectious disease
  • Positive serologic tests for HIV, HCV, HBV, HTLV-1 and 2, Syphilis or Chagas disease
  • Previous drug reaction for antithymocyte globulin, cyclosporin or corticosteroids
  • Severe organic impairment (renal, hepatic, cardiac, pulmonary)
  • Uncontrolled hypertension or diabetes
  • Pregnancy
  • Previous history of allergic reaction to penicillin or streptomycin
  • Severe psychiatric disorder
  Contacts and Locations

Please refer to this study by its identifier: NCT01297972

Contact: Diego V Clé, MD 55-16-81126986
Contact: Rodrigo T Calado, MD 55-16-36022610

Hospital das Clínicas da Faculdade de Medicina de Ribeirão Preto da Universidade de São Paulo Recruiting
Ribeirão Preto, São Paulo, Brazil, 14048900
Contact: Diego V Clé, MD     55-16-81126986    
Sponsors and Collaborators
University of Sao Paulo
Principal Investigator: Diego Villa Clé, MD University of São Paulo
Study Chair: Rodrigo Tocantins Calado, MD University of São Paulo
  More Information


Responsible Party: Diego Villa Clé, MD, University of São Paulo Identifier: NCT01297972    
History of Changes
Other Study ID Numbers: CONEP 16119
Study First Received: February 16, 2011
Last Updated: February 16, 2011
Health Authority: Brazil: National Committee of Ethics in Research

Keywords provided by University of Sao Paulo:

Aplastic Anemia
Mesenchymal Stem Cells

Additional relevant MeSH terms:

Anemia, Aplastic
Hematologic Diseases
Bone Marrow Diseases processed this record on August 21, 2012

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