Idelalisib treatment prior to allogeneic stem cell transplantation for patients with chronic lymphocytic leukemia: a report from the EBMT chronic malignancies working party

Johannes Schetelig*, Patrice Chevallier, Michel van Gelder, Jennifer Hoek, Olivier Hermine, Ronjon Chakraverty, Paul Browne, Noel Milpied, Michele Malagola, Gerard Socie, Julio Delgado, Eric Deconinck, Ghandi Damaj, Sebastian Maury, Dietrich Beelen, Stephanie Nguyen Quoc, Paneesha Shankara, Arne Brecht, Jiri Mayer, Mathilde Hunault-BergerJoerg Bittenbring, Catherine Thieblemont, Stephane Lepretre, Henning Baldauf, Liesbeth C. de Wreede, Olivier Tournilhac, Ibrahim Yakoub-Agha, Nicolaus Kroeger, Peter Dreger

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review


No studies have been reported so far on bridging treatment with idelalisib for patients with chronic lymphocytic leukemia (CLL) prior to allogeneic hematopoietic cell transplantation (alloHCT). To study potential carry-over effects of idelalisib and to assess the impact of pathway-inhibitor (PI) failure we performed a retrospective EBMT registry-based study. Patients with CLL who had a history of idelalisib treatment and received a first alloHCT between 2015 and 2017 were eligible. Data on 72 patients (median age 58 years) were analyzed. Forty percent of patients hadTP53(mut/del)CLL and 64% had failed on at least one PI. No primary graft failure occurred. Cumulative incidences of acute GVHD degrees II-IV and chronic GVHD were 51% and 39%, respectively. Estimates for 2-year overall survival (OS), progression-free survival (PFS), and cumulative incidences of relapse/progression (CIR) and non-relapse mortality NRM were 59%, 44%, 25%, and 31%. In univariate analysis, drug sensitivity was a strong risk factor. For patients who had failed neither PI treatment nor chemoimmunotherapy (CIT) the corresponding 2-year estimates were 73%, 65%, 15%, and 20%, respectively. In conclusion, idelalisib may be considered as an option for bridging therapy prior to alloHCT. Owing to the high risk for acute GVHD intensified clinical monitoring is warranted.

Original languageEnglish
Pages (from-to)605-613
Number of pages9
JournalBone Marrow Transplantation
Issue number3
Early online date2 Oct 2020
Publication statusPublished - Mar 2021


  • CLL

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