Volume 164, Issue 6 pp. 841-850
Research Paper

MET dysregulation is a hallmark of aggressive disease in multiple myeloma patients

Alberto Rocci

Alberto Rocci

Myeloma Unit, Division of Haematology, University of Torino, Azienda Ospedaliera Città della Salute e della Scienza di Torino, Torino, Italy

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Manuela Gambella

Manuela Gambella

Myeloma Unit, Division of Haematology, University of Torino, Azienda Ospedaliera Città della Salute e della Scienza di Torino, Torino, Italy

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Simona Aschero

Simona Aschero

Myeloma Unit, Division of Haematology, University of Torino, Azienda Ospedaliera Città della Salute e della Scienza di Torino, Torino, Italy

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Ileana Baldi

Ileana Baldi

Unit of Biostatistics, Public Health and Epidemiology, Department of Cardiac, Thoracic and Vascular Sciences, University of Padova, Padova, Italy

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Livio Trusolino

Livio Trusolino

Laboratory of Molecular Pharmacology, Institute for Cancer Research and Treatment (IRCC), Candiolo (Torino), Italy

Department of Oncological Sciences, University of Torino School of Medicine, Candiolo (Torino), Italy

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Federica Cavallo

Federica Cavallo

Myeloma Unit, Division of Haematology, University of Torino, Azienda Ospedaliera Città della Salute e della Scienza di Torino, Torino, Italy

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Francesca Gay

Francesca Gay

Myeloma Unit, Division of Haematology, University of Torino, Azienda Ospedaliera Città della Salute e della Scienza di Torino, Torino, Italy

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Alessandra Larocca

Alessandra Larocca

Myeloma Unit, Division of Haematology, University of Torino, Azienda Ospedaliera Città della Salute e della Scienza di Torino, Torino, Italy

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Valeria Magarotto

Valeria Magarotto

Myeloma Unit, Division of Haematology, University of Torino, Azienda Ospedaliera Città della Salute e della Scienza di Torino, Torino, Italy

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Paola Omedè

Paola Omedè

Myeloma Unit, Division of Haematology, University of Torino, Azienda Ospedaliera Città della Salute e della Scienza di Torino, Torino, Italy

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Gianluca Isaia

Gianluca Isaia

Division of Geriatric, Department of Clinical and Biological Sciences, S. Luigi Gonzaga Hospital, University of Torino, Torino, Italy

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Andrea Bertotti

Andrea Bertotti

Laboratory of Molecular Pharmacology, Institute for Cancer Research and Treatment (IRCC), Candiolo (Torino), Italy

Department of Oncological Sciences, University of Torino School of Medicine, Candiolo (Torino), Italy

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Anna M. Liberati

Anna M. Liberati

Department of Oncohaematology, University of Perugia, Santa Maria Hospital, Terni, Italy

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Lucio Catalano

Lucio Catalano

Divisione di Ematologia, Università Federico II, Napoli, Italy

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Luca De Rosa

Luca De Rosa

Haematology and Bone Marrow Transplantation Unit, Azienda Ospedaliera San Camillo-Forlanini, Rome, Italy

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Pellegrino Musto

Pellegrino Musto

Department of Onco-Haematology, IRCCS, Referral Cancer Center of Basilicata, Rionero in Vulture (Pz), Italy

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Roberto Vallone

Roberto Vallone

Servizio di Immunoematologia e Trasfusione, DH Ematologia Azienda Ospedaliera G. Rummo, Benevento, Italy

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Antonietta Falcone

Antonietta Falcone

Divisione di Ematologia, Casa Sollievo della Sofferenza, San Giovanni Rotondo, Italy

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Daniela Drandi

Daniela Drandi

Division of Haematology, University of Torino, Azienda Ospedaliera Città della Salute e della Scienza di Torino, Torino, Italy

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Marco Ladetto

Marco Ladetto

Division of Haematology, University of Torino, Azienda Ospedaliera Città della Salute e della Scienza di Torino, Torino, Italy

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Paolo M. Comoglio

Paolo M. Comoglio

Laboratory of Molecular Pharmacology, Institute for Cancer Research and Treatment (IRCC), Candiolo (Torino), Italy

Department of Oncological Sciences, University of Torino School of Medicine, Candiolo (Torino), Italy

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Mario Boccadoro

Mario Boccadoro

Myeloma Unit, Division of Haematology, University of Torino, Azienda Ospedaliera Città della Salute e della Scienza di Torino, Torino, Italy

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Antonio Palumbo

Corresponding Author

Antonio Palumbo

Myeloma Unit, Division of Haematology, University of Torino, Azienda Ospedaliera Città della Salute e della Scienza di Torino, Torino, Italy

Correspondence: Antonio Palumbo, Myeloma Unit, Division of Haematology, University of Torino, Azienda Ospedaliera Città della Salute e della Scienza di Torino, Torino, Italy.

E-mail: [email protected]

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First published: 23 January 2014
Citations: 15

Summary

Abnormal activation of MET/HGF (Hepatocyte Growth Factor) pathway has been described in several tumours and increased HGF plasmatic levels have been detected in patients with aggressive multiple myeloma (MM). MET and HGF mRNA expression was investigated in 105 samples of purified plasma cells derived from newly diagnosed MM patients treated with bortezomib-based induction therapy. Gene expression was compared with response to therapy and clinical outcome. MET gene copy number was also evaluated. MET mRNA expression was higher in CD138+ than in CD138 cells (median 76·90 vs. 11·24; P = 0·0009). Low MET mRNA expression characterized patients with better response (complete response or very good partial response) compared to other patients (median 56·10 vs. 134·83; P = 0·0006). After a median follow-up of 50 months, patients with high MET mRNA expression displayed a worse progression-free survival (PFS; P = 0·0029) and overall survival (OS; P = 0·0023) compared to those with low MET mRNA levels. Patients with both high MET mRNA expression and high β2-microglobulin level (>5·5 mg/l) had further worse median PFS (P < 0·0001) and OS (P < 0·0001). Patients carrying 4 MET gene copies (8 out of 82, 9·8%) also had a short PFS. High MET mRNA expression identifies patients with dismal PFS and OS and the combination with high β2-microglobulin further characterizes patients with worse outcome.

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