Abstract
Hyperactivation of the Hedgehog (Hh) pathway, which controls refueling of multiple myeloma (MM) clones, might be critical to disease recurrence. Although several studies suggest the Hh pathway is activated in CD138− immature cells, differentiated CD138+ plasma cells might also be able to self-renew by producing themselves the Hh ligands. We studied the gene expression profiles of 126 newly diagnosed MM patients analyzed in both the CD138+ plasma cell fraction and CD138−CD19+ B-cell compartment. Results demonstrated that an Hh-gene signature was able to cluster patients in two subgroups characterized by the opposite Hh pathway expression in mature plasma cells and their precursors. Strikingly, patients characterized by Hh hyperactivation in plasma cells, but not in their B cells, displayed high genomic instability and an unfavorable outcome in terms of shorter progression-free survival (hazard ratio: 1.92; 95% confidence interval: 1.19–3.07) and overall survival (hazard ratio: 2.61; 95% confidence interval: 1.26–5.38). These results suggest that the mechanisms triggered by the Hh pathway ultimately led to identify a more indolent vs a more aggressive biological and clinical subtype of MM. Therefore, patient stratification according to their molecular background might help the fine-tuning of future clinical and therapeutic studies.
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Acknowledgements
This work was partly supported by programme funding from AIRC (Associazione Italiana Ricerca sul Cancro) Investigator Research Grant (to MC), RFO (Ricerca Fondamentale Orientata; to MC), BolognAIL (Associazione Italiana contro le Leucemie-Linfomi e Mieloma), Fondazione Guido Berlucchi, Progetto di Ricerca 2014 (to CT) and Progetto Regione-Università 2010/2012L Bolondi (to G Martinelli).
Author contributions
MM and CT designed research, analyzed and interpreted the data and wrote the manuscript; BS, MP and FAD collected samples and data; MM performed gene expression experiments; EB performed immunoblot assays; DR analyzed gene expression results; NT and G Marzocchi provided data on FISH experiments; G Martinelli interpreted the data; EZ, PT, LP and SR provided the clinical data; AP performed statistical correlations; MC critically revised the paper that was approved by the other authors.
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Martello, M., Remondini, D., Borsi, E. et al. Opposite activation of the Hedgehog pathway in CD138+ plasma cells and CD138−CD19+ B cells identifies two subgroups of patients with multiple myeloma and different prognosis. Leukemia 30, 1869–1876 (2016). https://doi.org/10.1038/leu.2016.77
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DOI: https://doi.org/10.1038/leu.2016.77
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