Therapeutic combinations of a phosphoinositide 3-kinase (PI3K) inhibitor, including PI3K inhibitors selective for the γ- and δ-isoforms and selective for both γ- and δ-isoforms (PI3K-γ,δ, PI3K-γ, and PI3K-δ), a Janus kinase-2 (JAK-2) inhibitor, a Bruton's tyrosine kinase (BTK) inhibitor, and/or a B-cell lymphoma-2 (BCL-2) inhibitor are described. In some embodiments, the invention provides therapeutic combinations of a PI3K-δ inhibitor and a BTK inhibitor, a JAK-2 and a BTK inhibitor, and a BCL-2 and BTK inhibitor.