RecruitingPhase 1Device studyHaploidentical Hematopoietic Stem Cell Transplantation With Ex Vivo TCR Alpha/Beta and CD19 Depletion in Pediatric Hematologic MalignanciesThis single arm pilot phase I study with safety run-in is designed to estimate the safety and efficacy of a familial mismatched or haploidentical hematopoietic stem cell transplantation (haplo-HSCT) using a novel graft modification technique (selective αβ-TCR and CD19 depletion).