Study of Gene Modified Donor T-cells Following TCR Alpha Beta Positive Depleted Stem Cell Transplant

Inclusion Criteria:

Age > 1 month and < 26 years
Life expectancy > 10 weeks
Subjects deemed eligible for allogeneic stem cell transplantation.
Subjects with life-threatening hematological malignancies (high-risk ALL in 1st CR, ALL in 2nd or subsequent CR, AML in 1st CR, AML in 2nd or subsequent CR, myelodysplastic syndromes, non-Hodgkin lymphomas in 2nd or subsequent CR, other hematologic malignancies eligible for stem cell transplantation per institutional standard);

Non-malignant disorders amenable to cure by an allograft:

primary immune deficiencies,
severe aplastic anemia not responding to immune suppressive therapy,
osteopetrosis,
hemoglobinopathies, (thalassemias, and sickle cell anemia, and Diamond-Blackfan anemia among others)
congenital/hereditary cytopenia, including Fanconi Anemia before any clonal malignant evolution (MDS, AML) Note: Subjects will be eligible if they meet either item 4 OR item 5.
Lack of suitable conventional donor (HLA identical sibling or HLA phenotypically identical relative or 10/10 unrelated donor evaluated using high resolution molecular typing) or presence of rapidly progressive disease not permitting time to identify an unrelated donor
A minimum genotypic identical match of 5/ 10 is required.
The donor and recipient must be identical, as determined by high resolution typing, at least one allele of each of the following genetic loci: HLA-A, HLA-B, HLA-Cw, HLA- DRB1 and HLA-DQB1.
Lansky/Karnofsky score > 50
Signed written informed consent

Exclusion Criteria:

Greater than Grade II acute GVHD or chronic extensive GVHD due to a previous allograft at the time of inclusion
Subject receiving an immunosuppressive treatment for GVHD treatment due to a previous allograft at the time of inclusion
Dysfunction of liver (ALT/AST > 5 times normal value, or bilirubin > 3 times normal value), or of renal function (creatinine clearance < 30 mL / min)
Severe cardiovascular disease (arrhythmias requiring chronic treatment, congestive heart failure or left ventricular ejection fraction < 40%)
Current active infectious disease (including positive HIV serology or viral RNA)
Serious concurrent uncontrolled medical disorder
Pregnant or breastfeeding subject
For subjects who have received more than 1 x 10E5 alpha/beta T cells/kg with the graft infusion the clinical trial site must contact the sponsor for approval to be eligible to receive BPX-501 infusion.