Analysis of KIR+CD56+ T Cells and FcRg-CD56+CD3- NK Cells in Pediatric Allogeneic Hematopoietic Stem Cell Transplant Patients and Donors
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 35
- 试验地点
- 1
- 主要终点
- Number of FcRg-CD56+CD3- NK cells in stem cell recipients and donors
研究概览
简要总结
Viral infections and reactivation during pediatric allogeneic hematopoietic stem cell transplantation (HSCT) are a common occurrence and significantly contribute to post-transplant morbidity and mortality. The risk is high due to prolonged periods of immune deficiency while awaiting immune reconstitution post-transplant. Current strategies to reduce complications from viral infections include prophylactic treatment, close monitoring for viral infections and prompt treatment at the first sign of symptoms or increasing viral load. However, the most definitive treatment for viral infections remains the host's cellular defenses. Improved understanding of the immune systems response to viral infections may lead to better treatment strategies.
This study is being done to explore the relationships between T-cells and NK cells (infection fighting cells) and viral infections or reactivations in young allogeneic stem cell transplant patients. The investigators will be looking at how these cells react and function in young patients receiving allogeneic stem cell transplantation, as well as in healthy stem cell donors.
详细描述
PRIMARY OBJECTIVE:
- To explore the expansion patterns of KIR+CD56+ T-cells and FcRg-CD56+CD3- NK cells in response to viral infection and reactivation in pediatric allogeneic hematopoietic stem cell transplant (HSCT) patients.
SECONDARY OBJECTIVES:
- To describe the phenotype of KIR+CD56+ T-cells and FcRg-CD56+CD3- NK cells in pediatric allogeneic HSCT patients and healthy donors.
- To describe the specificity and functional capacity of KIR+CD56+ T-cells against viral antigens in both pediatric allogeneic HSCT patients and healthy donors.
- To describe the functional capacity of FcRg-CD56+CD3- NK cells against CMV-infected cells in both pediatric allogeneic HSCT patients and healthy donors.
研究设计
- 研究类型
- Observational
- 观察模型
- Cohort
- 时间视角
- Prospective
入排标准
- 年龄范围
- — 至 21 Years（Child, Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Patients undergoing allogeneic hematopoietic stem cell transplant (HSCT) for a hematologic malignancy or a donor for a patient undergoing allogeneic hematopoietic stem cell transplant for a hematologic malignancy.
- •For HSCT patients: ages birth to 21 years old; for donors: any age.
- •For minors less than 18 years old, both parents must be available on St. Jude campus to provide consent. One parent/legal guardian will be acceptable if one parent is deceased, incompetent, or when the one parent present has legal responsibility for the care and custody of the child.
排除标准
- •Patients undergoing allogeneic hematopoietic stem cell transplant for a disease other than a hematologic malignancy
结局指标
主要结局
Number of FcRg-CD56+CD3- NK cells in stem cell recipients and donors
时间窗: Donors once within 1 week prior to stem cell donation. HSCT recipients: baseline within 1 week prior to stem cell infusion and every 2 weeks, up to 100 days post-transplantation
Blood samples will be drawn as follows: * Donors will have a blood sample drawn once within 1 week prior to stem cell donation. * HSCT recipients will have serial blood samples: a baseline sample within 1 week prior to stem cell infusion and collections every 2 weeks, up to 100 days post-transplantation Summary statistics of the two cell populations, such as mean, median, range, and standard error, will be provided.
Percentage of KIR+CD45+ T-cells in stem cell recipients and donors
时间窗: Donors once within 1 week prior to stem cell donation. HSCT recipients: baseline within 1 week prior to stem cell infusion and every 2 weeks, up to 100 days post-transplantation
Blood samples will be drawn as follows: * Donors will have a blood sample drawn once within 1 week prior to stem cell donation. * HSCT recipients will have serial blood samples: a baseline sample within 1 week prior to stem cell infusion and collections every 2 weeks, up to 100 days post-transplantation Summary statistics of the two cell populations, such as mean, median, range, and standard error, will be provided.
次要结局
- Surface marker expression density of phenotype KIR+CD56+ T-cells and FcRg-CD56+CD3- NK cells in donors and recipients(Donors once within 1 week prior to stem cell donation. HSCT recipients: within 1 week prior to stem cell infusion and within 1 week of 100 days post-transplantation)
- Change in numbers and percentages of KIR+CD56+T-cells after exposure to viral antigen in vitro and cytokine expression levels(Donors once within 1 week prior to stem cell donation. HSCT recipients: baseline within 1 week prior to stem cell infusion and every 28 days, up to 100 days post-transplantation)
- Percentage of KIR+CD56+ T-cells that stain for tetramer/pentamer(Donors once within 1 week prior to stem cell donation. HSCT recipients: baseline within 1 week prior to stem cell infusion and every 28 days, up to 100 days post-transplantation)
- Number of FcRg-CD56+CD3- NK cells after exposure to cytomegalovirus(Donors once within 1 week prior to stem cell donation. HSCT recipients: within 1 week prior to stem cell infusion and within 1 week of 100 days post-transplantation)