601072 Described herein is the use of (a) a PNP inhibitor (b) an anti-CD20 agent and optionally (c) an alkylating agent, in the manufacture of a medicament for treating a hematologic cancer in a subject in need thereof, wherein the medicament is formulated for separate, sequential or simultaneous administration of (a), (b) and (c). The combination of Forodesine, Bendamustine and Rituximab is exemplified. Examples of treated conditions include non-Hodgkin’s lymphoma, chronic lymphocytic leukemia and acute lymphocytic leukemia.