To this end, we examined primary leukemic specimens of patients from the phase II childhood refractory/relapsed ALL trial (AALL07P1 study, NCT00873093) in which BTZ is administered in two intensive re-induction regimens containing vincristine, prednisone, PEG-asparaginase, doxorubicin or cyclophosphamide and etoposide followed by methotrexate treatment. This evidence concerns the gene ASPG and acute lymphoblastic leukemia.