Abstract
The use of bortezomib in the clinic has significantly improved outcomes for patients with multiple myeloma (MM), even those harboring high-risk cytogenetic abnormalities or those classified in the high-risk category according to the International Staging System (ISS). In this study, we analyzed the association between immunophenotyping on myeloma cells and the clinical outcomes of patients who received bortezomib-based regimens as first-line therapy. Immunophenotypic analysis before bortezomib therapy was performed by flow cytometry, and whether the immunophenotyping results influenced the clinical outcomes of the patients was investigated. Seventy-four newly diagnosed patients with MM were included in this study. We found that the expression of MPC-1 significantly predicted the time to next therapy (TNT), with a longer TNT in the MPC-1 positive group (p = 0.005), whereas it did not affect overall survival (OS; p = 0.773). In addition, we found that CD45-positivity was associated with shorter TNT (p = 0.0432). Following ISS assessment at treatment initiation, patients who were classified as stage I showed a slightly longer OS compared to those at stage II or III; however, these results were not significant (p = 0.0987). Furthermore, multivariate analysis revealed the prognostic significance of MPC-1 expression, as MPC-1-negativity was associated with a worse TNT. The combination of MPC-1 and CD45 status more sensibly predicted the TNT for bortezomib therapy. Our results demonstrate the clinical importance of immunophenotyping on myeloma cells to determine patient prognoses in this era of novel therapeutic agents.
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We thank Ms. Sachiyo Mazume for collecting the data necessary to make this study possible.
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NI received honoraria and speaker fees from Bristol-Myers Squibb, Celgene K.K., Takeda Pharma Co., Ltd., and Ono Parma Co., Ltd. KM received honoraria and speaker fees from Celgene K.K., Takeda Pharma Co., Ltd., and Ono Parma Co., Ltd. HT, MN, and TH reports honoraria and speaker fees from Bristol-Myers Squibb. YH received speaker fees and honoraria from Celgene K.K., Janssen Pharmaceutical K.K., Bristol-Myers Squibb, Takeda Pharma Co., Ltd., and Ono Parma Co., Ltd. MT received honoraria from Janssen Pharmaceutical K.K., Bristol-Myers Squibb, Takeda Pharma Co., Ltd., and Ono Parma Co., Ltd., supports for extension lectures from Bristol-Myers Squibb, and scholarship funds from Takeda Pharma Co., Ltd. and Ono Parma Co., Ltd. In addition, MT is part of an international clinical trial evaluating an investigational drug that was developed by Bristol-Myers Squibb for the treatment of Sjögren’s syndrome and has cooperative research with Celgene K.K. The remaining co-authors declare no competing financial interests.
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All procedures were performed in accordance with the ethical standards of the Institutional Research Committee of the Nihon University Itabashi Hospital and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
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Kurihara, K., Iriyama, N., Miura, K. et al. MPC-1 expression in myeloma cells is associated with the efficacy of bortezomib therapy. Med Oncol 36, 75 (2019). https://doi.org/10.1007/s12032-019-1298-5
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DOI: https://doi.org/10.1007/s12032-019-1298-5