NOTCH1 mutations identify a chronic lymphocytic leukemia patient subset with worse prognosis in the setting of a rituximab-based induction and consolidation treatment

Michele Dal Bo, Maria Ilaria Del Principe, Federico Pozzo, Dario Ragusa, Pietro Bulian, Davide Rossi, Giovanni Capelli, Francesca Maria Rossi, Pasquale Niscola, Francesco Buccisano, Riccardo Bomben, Antonella Zucchetto, Luca Maurillo, Paolo de Fabritiis, Sergio Amadori, Gianluca Gaidano, Valter Gattei, Giovanni Del Poeta

Research output: Contribution to journalArticlepeer-review

Abstract

Induction therapy with fludarabine followed by rituximab and consolidation plus maintenance with rituximab improved response duration (RD) and overall survival (OS) in our patients with chronic lymphocytic leukemia (CLL). The aim of our study was to investigate the clinical impact of NOTCH1 mutations in this setting of patients. The study included 123 progressive CLL patients homogeneously assigned to first-line induction treatment with fludarabine followed by rituximab. Fifty-nine patients either in complete remission (CR) minimal residual disease positive (MRD+) after induction (n = 39) or in partial remission (PR, n = 20) underwent consolidation/maintenance therapy with rituximab. Sixteen patients in CR MRD + or PR underwent observation only. The presence of NOTCH1 mutations was investigated by amplification refractory mutation system (ARMS) PCR and by Sanger sequencing. NOTCH1 mutations occurred in 20 out of 123 (16.3 %) cases. Consolidated patients showed longer OS than unconsolidated patients (p = 0.030). Both NOTCH1 mutated and CR MRD+ or PR NOTCH1 mutated patients showed significantly shorter OS after treatment (p = 0.00014 and p = 0.0021, respectively). Moreover, NOTCH1 wild-type consolidated cases experienced significantly longer RD and OS than NOTCH1 mutated consolidated or not consolidated cases (p = 0.00001 and p = 0.018, respectively). Finally, the independent prognostic impact of NOTCH1 mutations for OS was confirmed in multivariate analysis (p <0.001). The presence of NOTCH1 mutations identifies a CLL subset with worse prognosis in the setting of a rituximab-based induction and consolidation treatment.

Original languageEnglish
Pages (from-to)1765-1774
Number of pages10
JournalAnnals of Hematology
Volume93
Issue number10
DOIs
Publication statusPublished - Oct 1 2014

Keywords

  • Chronic lymphocytic leukemia
  • NOTCH1 mutations
  • Overall survival
  • Response duration
  • Rituximab

ASJC Scopus subject areas

  • Hematology
  • Medicine(all)

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