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A Study Evaluating the Safety and Efficacy of the LentiGlobin BB305 Drug Product in β-Thalassemia Major Participants
Bu çalışma, β-talasemi majör hastalarında LentiGlobin BB305 ürünüyle yapılan otolog kan yapıcı kök hücre naklinin güvenliğini ve etkinliğini değerlendirmiştir. Üründe, hastanın kendi CD34+ kök hücrelerine, insan βA-T87Q-globin genini taşıyan LentiGlobin BB305 lentiviral vektörü aktarılmaktadır. Randomize olmayan, açık etiketli, tek dozluk Faz 1/2 (Phase 1/2) çalışmaya, en az 3 aday ergen dahil olmak üzere 12-35 yaş arasında ve düzenli kan nakli ihtiyacı olan (yılda en az 100 mL/kg eritrosit süspansiyonu ya da ≥8 transfüzyon) 18'e kadar katılımcı alınmıştır.
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Inclusion criteria: * Participants between 12 and 35 years of age, inclusive, at the time of consent/assent, and able to provide written consent/assent, if applicable. * Diagnosis of β-thalassemia major and a history of at least 100 mL/kg/year of pRBCs or ≥8 transfusions of pRBCs per year for the prior 2 years. * Eligible for allogeneic bone marrow transplant. * Treated and followed for at least the past 2 years in a specialized center that maintained detailed medical records, including transfusion history. Exclusion criteria: * Positive for presence of human immunodeficiency virus type 1 or 2 (HIV 1 and HIV 2). * A white blood cell (WBC) count \<3 × 10\^9/L, and / or platelet count \<100 × 10\^9/L if not due to hypersplenism. * Uncorrected bleeding disorder. * Any prior or current malignancy or myeloproliferative or immunodeficiency disorder. * Immediate family member with a known or suspected Familial Cancer Syndrome (including but not limited to hereditary breast and ovarian cancer syndrome, hereditary non-polyposis colorectal cancer syndrome and familial adenomatous polyposis). * Receipt of an allogeneic transplant. * Advanced liver disease, including persistent aspartate transaminase (AST), alanine transaminase (ALT), or total bilirubin value \>3 × the upper limit of normal, liver biopsy demonstrating cirrhosis, extensive bridging fibrosis, or active hepatitis. * Kidney disease with a calculated creatinine clearance \<30% normal value. * Uncontrolled seizure disorder. * Diffusion capacity of carbon monoxide (DLco) \<50% of predicted (corrected for hemoglobin). * A cardiac T2\* \<10 ms by magnetic resonance imaging (MRI). * Any other evidence of severe iron overload that, in the Investigator's opinion, warrants exclusion. * Clinically significant pulmonary hypertension, as defined by the requirement for ongoing pharmacologic treatment or the consistent or intermittent use of supplemental home oxygen. * Participation in another clinical study with an investigational drug within 30 days of Screening. * Any prior or current malignancy or myeloproliferative disorder. * Prior receipt of gene therapy.