18-FLT PET/MR Imaging to Predict Graft Failure and Graft Versus Host Disease in Bone Marrow Transplant Patients
试验速览
- 阶段
- 早期 1 期
- 状态
- 终止
- 入组人数
- 10
- 试验地点
- 1
- 主要终点
- Overall FLT-PET Bone Marrow Signal
研究概览
简要总结
Allogeneic HSCT is potentially curative for numerous high risk hematologic malignancies and offers several advantages over traditional chemotherapy. First, higher doses of cytotoxic chemotherapy and/or irradiation can be given since patients are subsequently rescued from the severe myelosuppression induced by the pre-transplant conditioning regimen by the infusion of healthy hematopoietic stem cells.
Second and perhaps more importantly, mature T cells contained in the graft are able to mount immune responses against residual cancer cells surviving the conditioning regimen due to major and/or minor MHC disparities between the donor and recipient. Unfortunately, the allo-immune responses driving the GVL effect are typically not specific for malignant cells. As a consequence, donor immune cells attack normal host tissues resulting in a process known as acute graft-versus-host disease (GVHD). Acute GVHD is primarily T cell driven, usually occurs within the first few months after transplant, and results in skin rash, diarrhea, cholestatic liver damage, and, on occasion, acute lung injury.
详细描述
The current proposal explores the use of a novel imaging modality, FLT PET/MRI, to correlate allogeneic transplant outcomes with FLT and MRI findings during early stem cell engraftment and at a later time point following stable count recovery. Specifically, this study will determine if the strength of the early FLT signal within the bone marrow correlates with engraftment success and if isolated areas of cellular proliferation within the marrow at a later time point might predict for leukemia relapse. In addition, based on the important role that host lymphoid tissues are known to play in GVHD pathogenesis in mice, this study will determine if the FLT signal within host SLT after transplant can predict for the development of GVHD in human BMT patients. Because FLT imaging by itself cannot distinguish between bone marrow engraftment/proliferation and the allo-immune driven T cell expansion that ultimately results in GVHD, this study will image autologous transplant patients as a comparator arm. Autologous HSCT like allogeneic transplantation involves the administration of very high doses of chemotherapy to high risk cancer patients in order to achieve better tumor kill. However, in this situation patients are administered their own cryopreserved stem cells to reconstitute the ablated hematopoietic system. Under those circumstances there is no allo-immune reactivity to drive T cell activation and expansion after transplant, and as a result there is no GVHD in the autologous transplant setting. Thus, these patients will help us to elucidate how much of the FLT signal seen in the allogeneic setting is the result of allo-immune driven T cell expansion.
研究设计
- 研究类型
- Interventional
- 分配方式
- Non Randomized
- 干预模型
- Single Group
- 主要目的
- Diagnostic
- 盲法
- None
入排标准
- 年龄范围
- 18 Years 至 99 Years（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Patients undergoing allogeneic bone marrow transplant for acute myeloid leukemia (AML), acute lymphoblastic leukemia (ALL), or myelodysplastic syndrome
- •Allogeneic transplant patients receiving either a fully myeloablative or reduced intensity chemotherapy +/- total body irradiation (TBI) conditioning regimen are eligible.
- •Allogeneic transplant patients receiving stem cells from a matched related, matched unrelated, mismatched unrelated, mismatched related (including haplotype matched) donors are eligible
- •Allogeneic transplant patients must be in a complete morphologic remission prior to transplant
- •Patients undergoing autologous bone marrow transplant for multiple myeloma
- •Myeloma patients must have achieved at least a very good partial remission prior to transplant and exhibit fewer than 10% plasma cells in their pre-transplant marrow biopsy
- •At least 18 years of age
- •Negative urine pregnancy test in women of child-bearing potential
排除标准
- •Any woman who is pregnant or has reason to believe she is pregnant or any woman who is lactating.
- •Condition that makes MRI unsafe (e.g., cardiac pacemaker, epicardial pacemaker leads, cochlear implants, metal aneurysm clip, metal halo devices)
- •Inability to tolerate MRI (e.g., unable to lie flat for > 1 hour, severe claustrophobia)
- •Known allergy to fluorothymidine
- •Creatinine clearance < 40 ml/min, as estimated by the Cockcroft-Gault formula
- •Body Mass Index (BMI) > 35
- •Poorly controlled diabetes mellitus (fasting blood glucose > 500 mg/dl)
- •Institutionalized subject (prisoner or nursing home patient)
- •Critically ill or medically unstable
- •Currently hospitalized (All FLT PET/MR scans will be obtained in the outpatient setting)
研究组 & 干预措施
Allogeneic
A total of 12 patients who have undergone allogenic bone marrow transplantation will undergo Fluorothymidine FLT-PET-MRI imaging on two separate occasions.
干预措施: Fluorothymidine (FLT) (Drug)
Autologous
3 patients undergoing autologous stem cell transplant will also undergo Fluorothymidine FLT-PET-MRI imaging the same two time points in order to determine how much of the FLT signal observed after allogeneic transplant is unique to that population and the result of allo-antigen driven T cell expansion.
干预措施: Fluorothymidine (FLT) (Drug)
结局指标
主要结局
Overall FLT-PET Bone Marrow Signal
时间窗: 35 Days (Approximate)
Compare the overall FLT-PET bone marrow signal on transplant day +25 between allogeneic stem cell transplant recipients who do and do not go on to achieve complete donor bone marrow reconstitution by transplant day +35.
Overall FLT-PET Signal Intensity within Host Secondary Lymphoid Sites
时间窗: 100 Days (Approximate)
Compare the overall FLT-PET signal intensity within host secondary lymphoid sites on transplant day +60 between allogeneic stem cell transplant recipients who do and do not develop acute GVHD by transplant day +100.
次要结局
- Overall Long-Term FLT-PET Bone Marrow Signal(100 Days (Approximate))
- Overall Long-Term FLT-PET Signal Intensity within Host Secondary Lymphoid Sites(100 Days (Approximate))
- Differences in FLT Uptake in Autologous HSCT and Allogeneic HSCT Patients(100 Days (Approximate))
- Strength of FLT-PET Signal and Transfusion Independence(35 Days (Approximate))
- Strength of the FLT-PET Signal and Bone Marrow Cellularity(35 Days (Approximate))
- Strength of FLT-PET Signal and Transfusion Independence (Long Term)(100 Days (Approximate))
- Strength of FLT-PET Signal and Bone Marrow Cellularity (Long Term)(100 Days (Approximate))
- Overall FLT-PET Signal Intensity and Acute Graft Versus Host Disease(60 Days (Approximate))
- Isolated/Asymmetric Foci of Increased FLT(100 Days (Approximate))
- Strength of FLT-PET signal and MRI Findings(60 Days (Approximate))