This multicenter Ph 2 study (NCT02825836) enrolled symptomatic, BTKi-naïve CLL/SLL pts ≥18 years...Treatment with TL-895 resulted in rapid clearance of leukemic compartments, particularly in TN pts, leading to earlier and deeper responses than expected with monotherapy BTKi. In R/R pts with a very high frequency of del17p/TP53MUT, remissions have been durable.