Clinical Trial: Alefacept in Patients With Relapsed/Refractory Aplastic Anemia

Study Status: Suspended
Recruit Status: Suspended
Study Type: Interventional

Official Title: A Phase 1/2 Study of Alefacept, a CD2 Receptor Antagonist in Patients With Relapsed/Refractory Aplastic Anemia

Brief Summary:

Aplastic Anemia (AA) is an autoimmune hematologic stem cell disease mediated by activated T-lymphocytes that leads to pancytopenia. The disease related morbidity and mortality if left untreated can approach 90%. For over 30 years, anti-thymocyte globulin (ATG) in combination with cyclosporine (CsA) remains the standard therapy. However, the treatment response with ATG is at best between 50-60% with a sizeable number of partial responses. Treatment with ATG is also associated with significant toxicity and high relapse rate that can be as high as 45%. Since the prognosis in refractory and relapsed AA remains poor, there is a need for less toxic novel immunosuppressive agents that can improve response rates and remission duration in refractory and relapsed AA.

Alefacept is a human recombinant dimeric fusion protein composed of the terminal portion of leukocyte functioning antigen-3 (LFA3/CD58) and the Fc portion of human IgG1. It prevents co-stimulatory signals between antigen presenting cells and memory T cells by competitive inhibition of CD2 in T cells, induces selective apoptosis of CD4+ and CD8+ memory effector T cells by interaction between the Fc portion of IgG1 and the FcyIII in NK cells, and possibly direct ligation of CD2 molecules on T cells that subsequently result in the alteration in T cell agonist signaling. It has been used successfully in the treatment of other T cell mediated disorders particularly psoriasis and steroid refractory graft versus host disease (GVHD) with minimal side effects. In a case of liver transplant associated AA (similar to transfusion associated AA) which is fatal in most patients, Alefacept induced remission after patient did not respond to ATG and other immunosuppressants. The investigators hypothesize that the LFA3-CD2 co-stimulatory pathway play an important role in the immune pathogenesis of AA and treatment with Alefacept can hel

Detailed Summary:

OBJECTIVES:

  1. Primary Objective

    • To define the safety, tolerability, dose-limiting toxicities (DLT), of alefacept in relapsed/ refractory aplastic anemia (AA).
    • To evaluate the efficacy of alefacept in refractory/ relapsed AA by determining overall response rates (ORR) which includes complete remission [CR] and partial remission (PR) rates.

  2. Secondary Objective

    • To evaluate for predictive markers for response to Alefacept with relapsed/ refractory AA and evaluate its effect on the PNH clone. The effects of alefacept in major populations of lymphocytes will be evaluated. The absolute numbers of various T cell populations including CD3+ T cell, CD3+/CD4+ T cell, CD3+/CD8+, CD57+ natural killer cell count and CD4/CD8 ratio will be measured as part of an immunodeficiency panel by flow cytometry. The functional properties of T cells will be evaluated by measuring markers of T cell activation and cytokine production. The saturation of CD2 receptors with alefacept will be determined. Occupied CD2 will not be detectable by competing antibody in-vitro. The expression of CD2 within lymphocytes will be measured prior to the initiation of therapy and every 2 weeks prior to and 30 minutes after the administration of alefacept. The presence of a Paroxysmal Nocturnal Hemoglobinuria (PNH) clone in patients with AA has been shown to correlate with increased response to immunosuppression25.

OUTLINE: This is an open-label, single center study. Patients will receiv
Sponsor: The Cleveland Clinic

Current Primary Outcome:

  • To measure the number of dose limiting toxicities (DLTs) as a determination of the maximum tolerable dose (MTD). [ Time Frame: Every 12 weeks ]
    The dosing cohorts includes (Cohort -1= 5 mg IV weekly, Cohort 1= 7.5 mg IV weekly, Cohort 2= 10 mg IV weekly, and Cohort 3= 12.5 mg IV weekly). The MTD will be defined as the dose level that has maxiumum effectiveness with minimal toxicity.
  • To evaluate the efficacy of alefacept in refractory/ relapsed AA by determining overall response rates (ORR) which includes complete remission [CR] and partial remission (PR) rates. [ Time Frame: Every 12 weeks ]


Original Primary Outcome: Same as current

Current Secondary Outcome: To analyze bood samples to evaluate for predictive markers for response to Alefacept with relapsed/ refractory AA and evaluate its effect on the PNH clone. [ Time Frame: Every 2 weeks for the first 4 weeks, then monthly after that ]

Original Secondary Outcome: Same as current

Information By: The Cleveland Clinic

Dates:
Date Received: December 20, 2010
Date Started: May 2011
Date Completion: November 2017
Last Updated: February 8, 2012
Last Verified: February 2012