PFS in the study population. Kaplan-Meier curves of PFS assessments in CLL/SLL patients treated with monotherapy duvelisib or ofatumumab. PFS was significantly longer for duvelisib-treated patients compared with ofatumumab-treated patients by assessments of blinded IRC (13.3 months vs 9.9 months, HR = 0.52, P < .0001) (A) and investigators (17.6 months vs 9.7 months, HR = 0.40, P < .0001) (B). BID, twice daily; DUV, duvelisib; OFA, ofatumumab.