Efficacy and Safety of PI3K Inhibitors in Relapsed/Refractory Large Granular T Lymphocytic Leukemia

"Elevated PI3K activity in T-LGL likely plays an important role in the ability of the pathologic cells to avoid homeostatic apoptosis, since inhibition of this pathway leads to apoptosis in the population of cells harboring the pathologic clone. More importantly, the activity of this pathway may represent a kind of Achilles heel for T-LGL in that PI3K inhibitors alone are quite effective at inducing spontaneous apoptosis in the clonal CTLs after a short incubation."