A method of treating hematological
cancer comprising administering to a patient in need thereof a therapeutically effective amount of a
phosphatidylinositol 3-
kinase gamma (PI3Kg) inhibitor and an
antimetabolite, optionally a therapeutically effective amount of a BCL-2 inhibitor. A method of identifying hematological
cancer patients susceptible to treatment with a PI3Kg inhibitor. A method of treating hematological
cancer, the method comprising administering to a patient in need thereof a therapeutically effective amount of a p-21 activated
kinase 1 (PAK-1) inhibitor, optionally a therapeutically effective amount of a BCL-2 inhibitor.