The present invention relates to methods of treating hematologic cancers using a combination of inhibitors of PD-1 or PD-L1 and TIM-3, LAG-3 or CTLA-4. In one embodiment, an inhibitor of PD-1 or PD-L1 is administered in combination with an inhibitor of TIM-3. In another embodiment, an inhibitor of PD-1 or PD-L1 is administered in combination with an inhibitor of LAG-3. In yet another embodiment, an inhibitor of PD-1 or PD-L1 is administered in combination with an inhibitor of CTLA-4.