A METHOD AND MEDICAMENT FOR TREATING MIXED LINEAGE LEUKEMIA; TRANSLOCATED MIXED LINEAGE LEUKEMIA; TRANSLOCATED MIXED LINEAGE LEUKEMIA BASED ACUTE MYELOGENOUS LEUKEMIA; TRANSLOCATED MIXED LINEAGE LEUKEMIA BASED ACUTE LYMPHOID LEUKEMIA; A NON-MLL BASED CHRONIC MYELOPROLIFERATIVE DISORDER, OR NON-MLL BASED ACUTE LYMPHOID LEUKEMIA IS PROVIDED, WHEREIN THE ACTIVE AGENT USED IS THE GSK-3 INHIBITOR 7-(2,5-DIHYDRO-4-IMIDAZO[1,2-A]PYRIDINE-3-YL-2,5-DIOXO-1H-PYRROL-3-YL)-9-FLUORO-1,2,3,4-TETRAHYDRO-2-(1-PIPERIDINYLCARBONYL)-PYRROLO [3,2,1-JK] [1,4]BENZODIAZEPINE OR A PHARMACEUTICALLY ACCEPTABLE SALT OR SOLVATE THEREOF.