B-cell Acute Lymphoblastic Leukemia Clinical Trial
Official title:
A Phase II Pilot Trial to Estimate Survival After a Non-total Body Irradiation (TBI) Based Conditioning Regimen in Patients Diagnosed With B-acute Lymphoblastic Leukemia (ALL) Who Are Pre-allogeneic Hematopoietic Cell Transplantation (HCT) Next-generation-sequence (NGS) Minimal Residual Disease (MRD) Negative
This study will evaluate the use of non- TBI (total body irradiation) conditioning for B-ALL patients with low risk of relapse as defined by absence of NGS-MRD (next generation sequencing minimal residual disease) before receiving a hematopoietic cell transplant (HCT). Patients diagnosed with B-ALL who are candidates for HCT will be screened by NGS-MRD on a test of bone marrow done before the HCT. Subjects who are pre-HCT NGS-MRD negative will be eligible to receive a non-TBI conditioning regimen as part of the treatment cohort of the study. Subjects who are pre-HCT NGS-MRD positive will be treated as per treating center standard and will be followed in an observational cohort (HCT center standard of care).
A Phase II pilot trial will estimate survival after a non-TBI based conditioning regimen in patients diagnosed with B-acute lymphoblastic leukemia (ALL) who are pre-allogeneic hematopoietic cell transplantation (HCT) next-generation-sequence (NGS) minimal residual disease (MRD) negative. The relationship of NGS-MRD status to survival in children, adolescents, and young adults with B-ALL undergoing any approach to allogeneic HCT will be explored in a larger cohort (treatment [phase II] and observational arms of the study). The primary objective is to estimate 2-year event free survival (EFS) in pre-HCT NGS-MRD negative patients with B-ALL undergoing a non-TBI based conditioning regimen through a multi-center prospective trial. The accrual period is 3 years. Patients that are NGS-MRD negative with B-ALL may be eligible for the Treatment Arm, which is myeloablative non-TBI conditioning with busulfan, fludarabine, and thiotepa followed -matched related, unrelated, and umbilical cord blood transplants. Patients that are NGS-MRD positive will be followed on the observational arm for outcome. Study sampling will include NGS-MRD bone marrow (BM) aspirate and peripheral blood (PB) samples collected [same day when possible] pre-HCT (within 4 weeks), and post-HCT on days 42 ± 14, 100 ± 20, and 365 ± 60; PB samples only will also be collected day 180± 60 and 270± 60; day +30, day +100, and 1-year post-HCT. NGS-MRD peripheral blood sample only at 6 months and 9 months post-HCT; (Blast specimen at time of diagnosis or relapse is required for NGS-MRD testing). ;
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