Scleroderma, Systemic Clinical Trial
Official title:
A Randomized, Open-Label, Phase II Multicenter Study of High-Dose Immunosuppressive Therapy Using Total Body Irradiation, Cyclophosphamide, ATGAM, and Autologous Transplantation With Auto-CD34+HPC Versus Intravenous Pulse Cyclophosphamide for the Treatment of Severe Systemic Sclerosis (SCSSc-01)
SCOT is a clinical research study designed for people with severe forms of scleroderma. SCOT stands for Scleroderma: Cyclophosphamide Or Transplantation. The SCOT study will compare the potential benefits of stem cell transplant and high-dose monthly cyclophosphamide (Cytoxan) in the treatment of scleroderma.
Severe systemic sclerosis (SSc) is a serious autoimmune disorder in which a person's own immune cells attack organs in the body. SSc affects the skin, joints, lungs, heart, intestinal tract, and kidneys, and half of the patients with the most severe organ involvement die within 5 years. Treatment for SSc usually includes supportive care or immunosuppressive drugs (drugs to suppress the immune system). As the immune cells are believed to be causing the disease, researchers are looking for new therapies that either slow down or stop this process, while not being too toxic. The main purpose of this study is to determine the safety and effectiveness of high-dose immunosuppressive therapy followed by reinfusion (transplantation) of the participant's own autologous (self) peripheral blood stem cells (PBSCs) compared to treatment with monthly (for 12 months) intravenous doses of cyclophosphamide (Cytoxan) therapy for the treatment of severe systemic sclerosis (SSc). These treatments are being given in order to determine if they will slow down or stop SSc from becoming more severe, and if they can reverse the effects of the disease. The researchers are evaluating the effects of the two treatments on serious organ damage and survival related to SSc, while also looking at the side effects of the two treatments. This trial also includes three optional mechanistic sub-studies open to a subset of participants enrolled in the SCOT trial: 1. Pharmacokinetics of 4-hydroxycyclophosphamide in Patients Receiving Cyclophosphamide for the SCOT trial (Originally listed separately as DAIT SCSSc-01-01, NCT00848614). The purpose of this study is to determine the plasma concentration and exposure time required for cyclophosphamide to produce optimal immunosuppressive activity with minimal toxicity in participants with severe systemic sclerosis. 2. Vascular Progenitor Cells and the Pathogenesis of Systemic Sclerosis(Originally listed separately as DAIT SCSSc-01-02, NCT00871221). The purpose of this study is to measure and characterize the circulating endothelial progenitor cells from the blood of 30 participants and also to determine the extent of vascular cell apoptosis and proliferation in cutaneous microvasculature in these participants before and after the receipt of the two SCOT treatment regimens. 3. Molecular Analysis of T Cell Immune Recovery for the SCOT Trial(Originally listed separately as DAIT SCSSc-01-03, NCT00872508). The purpose of this study is [1] to describe the condition of peripheral T cell reactivity and repertoire diversity in SSc patients and evaluate evidence for potential defects prior to randomization, [2] to gain a better understanding of the impact of cyclophosphamide (Cytoxan) and high-dose immunosuppressive therapy with autologous stem cell transplantation on thymopoiesis, and [3] to describe the kinetics and breadth of T cell immune recovery in SSc patients treated with these interventions. ;
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