1. Relapsed or refractory acute myeloid leukemia (AML), acute lymphocytic leukemia (ALL), chronic lymphocytic leukemia (CLL), high risk myelodysplasia (MDS) with an IPSS score > 2.5, Non-Hodgkin's lymphoma (NHL), Hodgkin's lymphoma (HD) or multiple myeloma, for which all potentially curative or standard salvage therapy options have been exhausted.