Try our beta test site
IMPORTANT: Listing of a study on this site does not reflect endorsement by the National Institutes of Health. Talk with a trusted healthcare professional before volunteering for a study. Read more...

Treatment of Autoimmune Thrombocytopenia (AITP)

This study has been completed.
Information provided by:
National Institutes of Health Clinical Center (CC) Identifier:
First received: November 3, 1999
Last updated: January 24, 2017
Last verified: March 21, 2011

Platelets are particles found along with red and white blood cells in the blood that play a role in the process of blood clotting. Disorders affecting the platelets can lower the amount of platelets in the blood and put patients at risk of bleeding. The condition of low platelets is referred to as thrombocytopenia.

Thrombocytopenia can be associated with a variety of diseases including cancer, leukemia, tuberculosis, or as a result of an autoimmune reaction. Autoimmune reactions are disorders in which the normal immune system begins attacking itself. Autoimmune thrombocytopenia (AITP) is a disorder of low blood platelet counts in which platelets are destroyed by antibodies produced by the immune system.

Unfortunately, many patients with AITP do not respond to standard treatments for thrombocytopenia. Cyclophosphamide is a drug that works to suppress the activity of the immune system. Researchers believe that combining this drug with transplanted rescued blood stem cells may provide effective treatment for AITP.

The purpose of this study is to explore the affordability and safety of this therapy for the treatment of AITP. The effectiveness of the therapy will be measured by the number of patients whose platelet levels rise greater than 100,000/m3.

If this treatment approach appears affordable, this study will form the basis for a larger study to compare alternate treatment approaches.

Condition Intervention Phase
Autoimmune Disease
Autoimmune Hemolytic Anemia
Device: Isolex 300i
Phase 1

Study Type: Interventional
Study Design: Allocation: Non-Randomized
Masking: No masking
Primary Purpose: Treatment
Official Title: High-Dose Cyclophosphamide With CD34+ Selected Autologous Hematopoietic Cell Support for Treatment of Refractory Chronic Autoimmune Thrombocytopenia

Resource links provided by NLM:

Further study details as provided by National Institutes of Health Clinical Center (CC):

Enrollment: 29
Study Start Date: July 21, 1997
Study Completion Date: June 11, 2009
Detailed Description:

Autoimmune Thrombocytopenia (AITP) is a disorder of low blood platelet counts in which platelet destruction is caused by antiplatelet autoantibodies. A large proportion of patients with chronic AITP are refractory to standard therapies including corticosteroids, immune globulin and splenectomy. Cyclophosphamide is a cytotoxic immunosuppressive agent which may induce durable remissions of refractory autoimmune diseases. High-dose cyclophosphamide with peripheral blood stem cell (PBPC) rescue has been proposed as a potential definitive therapy for AITP; however, the infusion of autoreactive lymphocytes could result in relapse. The use of PBPC depleted of T-lymphocytes could circumvent this limitation.

The purpose of this phase I/II study is to explore the feasibility and safety of this approach, and to seek preliminary evidence of effectiveness, of using high-dose cyclophosphamide (50 mg/kg/day x 4) followed by infusion of autologous PBPC enriched for CD34+ cells (concomitantly depleted of CD3+ cells) for the treatment of patients with refractory AITP. Safety/feasibility parameters to be examined will include the ability to mobilize, harvest and purify sufficient PBPC to yield greater than 2 x 10(6) CD34+ cells/kg; symptomatic acceptability and hematologic toxicities of the mobilization regimen (filgrastim 10 micrograms/kg/day IV); tolerability of the leukapheresis procedure, including the central line placement and maintenance; depth and duration of blood cell nadirs following chemotherapy; peritransplant bleeding episodes and transfusion requirements; episodes of febrile neutropenia, culture-proven infections and antibiotic usage. Effectiveness will be gauged by the rapidity and number of patients to achieve complete remission (platelet count greater than 100,000/mm(3) and partial remission (platelet count greater than 50,000/mm(3) or doubling of the platelet count with resolution of bleeding episodes). Ancillary evidence of therapeutic effect will be sought by examining changes in titers of platelet surface glycoprotein antibodies. In addition, alterations in T-lymphocyte subsets will be examined by flow cytometry. If this treatment approach appears feasible, this study will form the basis for a larger trial to compare alternate treatment approaches.


Ages Eligible for Study:   18 Years to 65 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Male or female, ages 18-65 years old.

Refractory severe chronic autoimmune thrombocytopenia, with or without autoimmune hemolytic anemia (Evan's syndrome), with all the following:

  1. Platelet count frequently below 20,000/mm(3) despite active

    treatment for a period of greater than 6 months.

  2. Normal or increased megakaryocytes on bone marrow


  3. No plausible alternative etiology such as drug-mediated

    thrombocytopenia, marrow failure syndrome or thrombocytopenia

    related to viral or bacterial infection.

  4. Failure of treatment with:

i. conventional-dose steroids (e.g., prednisone or dosage of 40

mg/day or equivalent, followed by dosage taper) for at least 3


ii. intravenous immunoglobulin.

iii. splenectomy.

e. Episodic bleeding requiring transfusions or ecchymoses interfering

with ordinary daily activities.


ECOG performance status greater than 1.

Cardiopulmonary disease including:

  1. History of coronary artery disease, angina pectoris or congestive heart failure.
  2. LV ejection fraction less than 40 percent by 2D echocardiogram.

Renal disease, serum creatinine greater than 2.5 mg/dL or creatinine clearance less than 30 mL/min.

Significant hepatic dysfunction, bilirubin greater than 2 mg/dL or transaminases greater than 2 times UNL.

Uncorrected coagulopathy.

Bone marrow aplasia (cellularity less than 10 percent), single or multilineage hematopoietic failure, myelodysplastic syndrome, or extensive marrow fibrosis.

History or active diagnosis of malignancy (except treated non-melanoma skin cancer or cevical carcinoma in situ).

HIV positive.

Pregnancy or lactation, unwillingness to practice adequate birth control in the peritransplant period.

Psychiatric illness or mental incapacity to understand and give informed consent.

Other medical illness or condition which, in the opinion of the Investigators, may contraindicate participation in this study due to patients' risk or compromise of study integrity.

  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: NCT00001630

United States, Maryland
National Institutes of Health Clinical Center, 9000 Rockville Pike
Bethesda, Maryland, United States, 20892
Sponsors and Collaborators
National Heart, Lung, and Blood Institute (NHLBI)
  More Information

Publications: Identifier: NCT00001630     History of Changes
Other Study ID Numbers: 970154
Study First Received: November 3, 1999
Last Updated: January 24, 2017

Keywords provided by National Institutes of Health Clinical Center (CC):
Autoimmune Disease
Evan's Syndrome
Autoimmune Hemolytic Anemia
Episodic Bleeding

Additional relevant MeSH terms:
Autoimmune Diseases
Anemia, Hemolytic, Autoimmune
Anemia, Hemolytic
Purpura, Thrombocytopenic, Idiopathic
Blood Platelet Disorders
Hematologic Diseases
Pathologic Processes
Immune System Diseases
Purpura, Thrombocytopenic
Blood Coagulation Disorders
Thrombotic Microangiopathies
Hemorrhagic Disorders
Skin Manifestations
Signs and Symptoms processed this record on April 27, 2017