A Phase 1 Clinical Trail of the Safety and Efficacy of Gene-modified Autologous Hematopoietic Stem Cell (BD211) Intravenous Infusion for the Treatment of Transfusion-dependent β-thalassaemia Patients
试验速览
- 阶段
- 1 期
- 状态
- 招募中
- 发起方
- 入组人数
- 9
- 试验地点
- 3
- 主要终点
- Mean time from BD211 treatment to successful neutrophil engraftment, as well as the number and percentage of participants with successful neutrophil engraftment.
研究概览
简要总结
This study will be intented to evaluate the safety, tolerability, and engraftment efficacy after myeloablative preconditioning and transplantation of autologous CD34+ hematopoietic stem cells transduced with a lentiviral vector encoding the human βA-T87Q-globin gene in patients with transfusion-dependent (TDT) β-thalassemia.
详细描述
This is an open-label, single-dose study of BD211 in patients with transfusion-dependent β-thalassemia aged 3 to 35 years. It is estimated that 9 subjects will be enrolled. BD211 is a gene modified gene therapy product designed to produce healthy β-globin in red blood cells in beta-thalassemia patients. The total follow-up duration was 18 months, the safe endpoints and effectiveness endpoints will be used to assess the safety and efficacy profiles in patients with transfusion-dependent β-thalassemia.
研究设计
- 研究类型
- Interventional
- 分配方式
- Na
- 干预模型
- Single Group
- 主要目的
- Treatment
- 盲法
- None
入排标准
- 年龄范围
- 3 Years 至 35 Years（Child, Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Participants aged 3 years (inclusive) to 18 years (exclusive), with no gender restrictions.
- •Parents/legal guardians have fully understood and voluntarily signed a written informed consent form; and it is recommended that children aged 8 and above be involved in the decision to participate in this clinical trial and obtain a written consent form.
- •Transfusion-dependent β-thalassemia patients. "Transfusion-dependent" is defined as: requiring at least 100 mL/kg of packed red blood cells annually; the genotype can be β0/β0, β0/β+, or β+/β+, diagnosed through hemoglobin studies.
- •Eligible for allogeneic hematopoietic stem cell transplantation, but without a donor or those refusing to undergo allogeneic hematopoietic stem cell transplantation.
- •Have undergone symptomatic treatment for at least the past 2 years and have retained medical records including transfusion history.
- •Stable condition and maintained an appropriate iron chelation regimen.
- •Good status of organ function.
- •Good compliance from the individual and parents/legal guardians, willing to adhere to visit schedules, trial plans, laboratory tests, and other trial procedures as stipulated in this protocol.
- •Willing to participate in long-term follow-up research.
排除标准
- •Has a fully HLA-matched hematopoietic stem cell donor and is willing to receive a fully HLA-matched hematopoietic stem cell transplant. Enrollment is otherwise only advised after review by the safety review committee.
- •Positive for antibodies against Human Immunodeficiency Virus 1/2 (HIV-1/HIV-2), Treponema pallidum (TP) specific antibodies, Human T-lymphotropic Virus 1 or 2 (HTLV-1/HTLV-2) antibodies, and Vesicular Stomatitis Virus G (VSV-G).
- •Positive for Hepatitis B Virus (HBV) HbsAg or HBV-DNA; Hepatitis C Virus (HCV) HCAb positive; positive nucleic acid test for Epstein-Barr Virus (EBV) or Cytomegalovirus (CMV).
- •Severe active bacterial, viral, fungal, malarial, or parasitic infections.
- •Has had, or currently has, a malignant, myeloproliferative, or immunodeficiency disorder.
- •Direct relatives with known or suspected hereditary cancer syndromes (including but not limited to breast cancer, colorectal cancer, ovarian cancer, prostate cancer, and pancreatic cancer).
- •Autoimmune diseases that could result in transfusion difficulties.
- •Major organ diseases or abnormal lab tests, including:
- •Liver cirrhosis, fibrosis, or active hepatitis, and/or abnormal liver function tests (Serum total bilirubin (TBIL) ≥ 1.5x Upper Limit of Normal (ULN); Alanine aminotransferase (ALT) and Aspartate aminotransferase (AST) ≥ 2.5x ULN; Alkaline phosphatase ≥ 2.5x ULN).
- •Heart disease, or Left Ventricular Ejection Fraction (LVEF) < 60%.
- •Kidney diseases, or serum creatinine ≥ 1.5ULN, creatinine clearance rate < 30% of the normal level (measured or calculated by the Cockcroft-Gault equation).
- •Endocrine disorders, such as insulin-dependent diabetes, hyperthyroidism, or hypothyroidism.
- •Severe iron overload, serum ferritin ≥ 5000 ng/mL.
- •Cardiac T2* < 20 ms, and/or liver iron content (LIC) ≥ 15mg/g liver weight by MRI.
- •Significant pulmonary hypertension diagnosed clinically according to guidelines, requiring clinical medical intervention.
- •Uncorrected bleeding disorders.
- •Severe psychiatric disorders.
- •Peripheral blood white cell (WBC) count < 3x10^9/L or platelets count < 120x10^9/L.
- •Received hydroxyurea treatment within the last 3 months before stem cell collection.
- •Used erythropoiesis-stimulating agents within the 3 months prior to HSC collection.
- •History of allogeneic transplantation.
- •Previously received any type of gene and/or cell therapy.
- •Participating in another clinical trial and is within a 30-day screening period.
- •Has contraindications to anesthesia.
- •Has contraindications to hematopoietic stem cell collection.
- •Allergic to the investigational drug or its excipients.
- •Any other conditions determined by the investigator as unsuitable for participation in this clinical trial.
结局指标
主要结局
Mean time from BD211 treatment to successful neutrophil engraftment, as well as the number and percentage of participants with successful neutrophil engraftment.
时间窗: 18 months
Definition of successful neutrophil engraftment: A consistent absolute neutrophil count (ANC) recovery of ≥0.5×10\^9/L over three consecutive days.
Proportion of participants achieving transfusion independence (TI)
时间窗: 18 months
TI defined as "hemoglobin (Hb) ≥ 90g/L without any transfusion of packed red blood cells (pRBCs) for 12 months at any time during the study period after BD211 treatment"; proportion of participants with TI = number of participants with TI ÷ total number of BD211 treatment.
Mean time from BD211 treatment to successful platelet engraftment, as well as the number and percentage of participants with successful platelet engraftment.
时间窗: 18 months
Definition of successful platelet engraftment: No platelet transfusion for 7 days with platelet counts of ≥20×10\^9/L in three consecutive measurements.
次要结局
- Mean Hb values after BD211 treatment(12 months~18months)
- Proportion of participants with 60% and 80% reduction in blood transfusions from baseline(12 months~18months)
- Change in ferritin levels from baseline.(18 months)
- Types, numbers and incidence rate of adverse events (AEs) and serious adverse events (SAEs) that occurred within 18 months after BD211 adminstration.(18 months)
- Mean time required from BD211 treatment (D0) to achieve TI(18 months)
- Incidence of aberrant replication competent lentivirus (RCL) or malignant transformation induced by vector insertion after BD211 treatment.(18 months)
- BD211 transplant-related mortality (TRM) and overall survival (OS) after BD211 treatment.(18 months)
- Total number of days hospitalized from the discharge day from LAFR to 18 months after BD211 administration(18 months)
- Mean duration (days) after participants reached TI(18 months)
- Expression of βA-T87Q globin protein in whole blood(18 months)
- Mean VCN of the BD211 lentivirus vector in peripheral blood(18 months)
- Dose-response relationship(18 months)