This study is evaluating the safety of haploidentical stem cell transplantation using high dose chemotherapy and radiotherapy, with the infusion of donor stem cells followed by the infusion of genetically modified donor T cells. The genetic modification involves the insertion of a safety switch, called iCasp9, into the donor T cells, which allows the cells to be removed with a drug, AP1903, if the patient develops graft-versus-host disease, which is a life-threatening complication of stem cell transplantation.

Condition: Leukaemia