Study design indicating the 2 schedules of imatinib administration in conjunction with the GMALL protocols 06/99 and 07/03. P indicates prephase; INDI, induction phase 1; INDII, induction phase 2; C1, consolidation phase 1; SCT, stem cell transplantation; CNS 24 Gy, CNS irradiation, scheduled by protocol in patients having achieved a CR after INDI; ith, intrathecal chemotherapy; MTX, methotrexate; BM, bone marrow analysis; MRD, minimal residual disease analysis; and diag, diagnosis.