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The introduction of agents inhibiting the BCR-associated kinases such as ibrutinib has dramatically changed treatments algorithms of chronic lymphocytic leukaemia (CLL) as well as the role of different adverse prognosticators. We evaluated the efficacy of ibrutinib as single agent, in a real-life context, on 180 patients with CLL mostly pre-treated, recruited from three independent cohorts from Italy. Patients received 420 mg oral ibrutinib once daily until progression or occurrence of unacceptable side effects. Seventy-three patients discontinued ibrutinib for progression or for adverse events. NOTCH1 mutations (M) were correlated with a reduced redistribution lymphocytosis, calculated at 3 months on ibrutinib (p=0.022). Moreover, NOTCH1 mutated patients showed inferior nodal response at 6 months on ibrutinib compared to NOTCH1 wild type patients (p&lt;0.0001). Significant shorter progression free survival (PFS) and overall survival (OS) were observed in NOTCH1 mutated patients (p=0.00002 and p=0.001). Interestingly, NOTCH1 M plus lower bax/bcl-2 ratio identified a CLL subset showing the worst PFS and OS (p=0.0002 and p=0.005). In multivariate analysis of PFS and OS, NOTCH1 M were confirmed an independent prognosticator (p=0.00006 and p=0.0039). In conclusion, NOTCH1 M are strongly associated with lower bax/bcl-2 ratio, consistent with a defective apoptosis, lower redistribution lymphocytosis and lower nodal shrinkage under ibrutinib treatment, this last responsible for partial responses, subsequent relapses, shorter PFS and OS. The therapeutic options for NOTCH1 mutated patients could be represented by either new small molecules combination approaches or from antibodies targeting NOTCH1.

haematologica

Impaired nodal shrinkage and apoptosis define the independent adverse outcome of NOTCH1 mutated patients under ibrutinib therapy in chronic lymphocytic leukaemia