Duvelisib Eliminates CLL B Cells, Impairs CLL-Supporting Cells, and Overcomes Ibrutinib Resistance in Preclinical Models

Inhibitors of Bruton’s Tyrosine Kinase (BTKi) and phosphoinositide 3-kinase (PI3Ki) have significantly improved therapy of chronic lymphocytic leukemia (CLL). However, the emergence of resistance to BTKi has introduced an unmet therapeutic need. Here we demonstrate in vitro and in vivo the essential roles of PI3K-δ for CLL B-cell survival and migration and of PI3K-γ in T-cell migration and macrophage polarization; and more efficacious inhibition in CLL-cell burden by dual inhibition of PI3K-δ,γ. We also report an ibrutinib-resistant CLL case, whose clone exhibited BTK and PLCγ2 mutations, responded immediately to single agent duvelisib with a redistribution lymphocytosis followed by a partial clinical remission associated with subsequent modulation of T and myeloid cells. CLL samples from patients progressed on ibrutinib were also responsive to duvelisib in patient-derived xenografts irrespective of BTK mutations. Our data support dual inhibition of PI3K-δ,γ as a valuable approach for therapeutic interventions, including patients refractory to BTKi.