Phase I/II Clinical Trial of mbIL21 ex Vivo-expanded Donor-derived NK-cell Infusions With Hematopoietic Stem Cell Transplantation for Disease Relapse Prophylaxis in Pediatric and Young Adult Patients With Chemorefractory or Minimal Residual Disease Positive Acute Leukemia
This pilot clinical trial aims to evaluate the feasibility, adverse reactions and maximum tolerated dose of mbIL21 ex vivo-expanded donor-derived NK-cell infusions before and after haploidentical or matched-related hematopoietic stem cell transplantation in a cohort of pediatric and young adult patients with chemorefractory or minimal residual disease (MRD) positive acute leukemia.
• Patient (age from 14 to 25 years) and/or patient's legal representative (age from 0 to 18 years) should provide written informed consent.
• Patients with one of the following disease:
‣ Acute myeloid leukemia: a. primary refractory disease (absence of complete remission (CR) after two induction regimens), b. refractory relapse (absence of CR after one salvage regimen), c. MRD-persistence before conditioning (presence of residual leukemic population more than 0,01% of bone marrow nucleated cells by flow cytometry);
⁃ Acute T-lymphoblastic leukemia: a. primary refractory disease (absence of complete remission (CR) after two induction regimens), b. refractory relapse (absence of CR after one salvage regimen), c. MRD-persistence before conditioning (presence of residual leukemic population more than 0,1% of bone marrow nucleated cells by flow cytometry);
⁃ Acute mixed phenotype leukemia: a. primary refractory disease (absence of complete remission (CR) after two induction regimens), b. refractory relapse (absence of CR after one salvage regimen), c. MRD-persistence before conditioning (presence of residual leukemic population more than 0,01% of bone marrow nucleated cells by flow cytometry).
• Patient is indicated to receive allo-HSCT according to actual clinical practice.
• Haploidentical or matched related donor was chosen and is available for allo-HSCT (and NK-cell therapy).
• Patient's clinical status: Lansky/Karnowski index ≥50%.
• Kidney function: clearance of endogenous creatinine or glomerular filtration rate according to Schwarz equation ≥50 ml/min/1,73 m2.
• Liver function: total bilirubin ≤3 ULN except for Gilbert's disease, ALT/AST ≤3 ULN.
• Heart function: left ventricular ejection fraction ≥40%.
• Lung function: lung capacity ≥50%, for children who cannot carry out of respiratory function - oxygen saturation during pulse oximetry ≥92% (without supplemental oxygen).
⁃ Life expectancy ≥8 weeks.
⁃ Patients who agree to long-term follow up for up to 2 years.