Open-Label Study Designed to Evaluate the Safety and Preliminary Efficacy of ApoCell for the Prevention of Acute GvHD
Graft Versus Host Disease
|Study Design:||Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Prevention
|Official Title:||Phase 1/2a, Multicenter, Open-Label Study Designed to Evaluate the Safety, Tolerability and Preliminary Efficacy of ApoCell Administration, a Donor Apoptotic Cell-Based Product, for the Prevention of Acute Graft Versus Host Disease (GvHD) in Subjects With Hematologic Malignancies Undergoing Allogeneic Sibling HLA-Matched Hematopoietic Stem Cell Transplantation (HSCT)|
- Determine the safety profile and tolerability [dose limiting toxicity (DLT)] of ascending doses of ApoCell in subjects undergoing allogeneic sibling HLA-matched HSCT within 180 days post-transplantation. [ Time Frame: 180 days ]
- *Determine the success rate for HSC engraftment and time to successful engraftment. *Describe the rates and grade of acute GvHD following ApoCell infusion. *Determine the success rate for HSC engraftment and time to successful engraftment. *Determine [ Time Frame: 180 days ]
|Study Start Date:||June 2009|
|Estimated Study Completion Date:||April 2016|
|Primary Completion Date:||December 2012 (Final data collection date for primary outcome measure)|
Three subjects per cohort will be treated with ApoCell according to an escalating schedule of doses
Three subjects per cohort will be treated with ApoCell according to an escalating schedule of doses starting at a single dose of 35 million apoptotic cells/kg in the first cohort of three subjects. Unless a DLT is experienced by subjects in a given cohort, the dose in the subsequent cohort will be increased by two-fold. The second cohort will receive 70 millions cells/kg, and the third cohort 140 millions cells/kg. The final fourth cohort will receive 210 millions cells/kg.
Allogeneic hematopoietic stem-cell transplantation (HSCT) has revolutionized the treatment of hematopoietic malignancies, inherited hematopoietic disorders, aplastic anemia, and other severe diseases. Unfortunately, graft versus host disease (GvHD) remains a major toxicity that greatly limits the application and efficacy of allogeneic HSCT, occurring commonly after the procedure and affecting 30 to 80% of patients. Acute GvHD occurs within 100 days in up to 50% of allogeneic HLA-matched HSCT recipients despite prophylactic immunosuppressive drugs.
The most efficient treatment for GvHD prevention is T cell depletion. However, most clinicians avoid that modality due to the crucial effect of T cells in prevention of tumor relapse. Current standard prophylaxis and therapy for acute GvHD include mainly the use of immunosuppressive drugs that help less than 50% of the patients and are associated with increased infection risk. New strategies of GvHD prophylaxis are examined and this study uses a physiological strategy of antigen presenting cell (APC) tolerance induction that will modulate effector cells either directly or via T regulatory cells.
ApoCell treatment is anticipated to be a prophylactic measure for acute GvHD by inducing tolerance in the donor effector cells, leading to a potentially significant decrease in the immune response of the donor cells against the recipient. The effects of apoptotic cells on preventing GvHD may involve the following mechanisms: inhibit pro-inflammatory cytokine production, promote anti-inflammatory cytokines production, induce tolarogenic APCs, decrease ability to stimulate T-cell responses, delete CD8 T-effector cells, induce regulatory T-cells, and inhibit response to inflammatory cytokines and LPS.
Tolarex Ltd. is proposing a novel cell-based approach of donor apoptotic cells treatment, ApoCell, for a Phase I-IIa study of patients undergoing sibling HSCT with high risk of developing acute GvHD. The ApoCell product is composed of HLA-matched donor mononuclear enriched leukocytes in the form of liquid suspension that will be injected intravenously to the patient 24 hours prior to HSCT. The ApoCell suspension contains at least 55% of early apoptotic cells. The cell suspension is prepared under cGMP conditions with PBS solution within 8 hours prior to intravenous injection and should be stored at 2-8oC until administered.
Please refer to this study by its ClinicalTrials.gov identifier: NCT00524784
|Department of Bone Marrow Transplantation|
|Jerusalem, Israel, 91120|
|Principal Investigator:||Reuven Or, Professor||Hadassah Medical Organization|