Clinical characteristics and prognostic values of 1p32.3 deletion detected through fluorescence in situ hybridization in patients with newly diagnosed multiple myeloma: a single-center study in China

Abstract

This study aimed to investigate the prevalence, clinical characteristics, and prognostic impact of 1p32.3 deletion in patients with newly diagnosed multiple myeloma (MM). A retrospective analysis was conducted on 411 patients with newly diagnosed MM; among which, 270 received bortezomib-based therapies, and 141 received thalidomide-based therapies. Fluorescence in situ hybridization (FISH) was performed to detect six cytogenetic abnormalities, namely, del(1p32.3), gain(1q21), del(17p13), del(13q14), t(4;14), and t(11;14). Results showed that 8.3% of patients with MM were detected with del(1p32.3) and had significantly more bone marrow plasma cells (P = 0.025), higher β2-microglobulin levels (P = 0.036), and higher lactate dehydrogenase levels (P = 0.042) than those without del(1p32.3). Univariate analysis showed that patients with del(1p32.3) under thalidomide-based therapies (median PFS 11.6 vs. 31.2 months, P = 0.002; median OS 16.8 vs. 45.9 months, P <0.001) were strongly associated with short progression-free survival (PFS) (P = 0.002) and overall survival (OS) (P <0.001). Multivariate analysis revealed that del(1p32.3) remained a powerful independent factor with worse PFS (P = 0.006) and OS (P = 0.016) for patients under thalidomide-based treatments. Patients with del(1p32.3) under bortezomib-based treatments tended to have short PFS and OS. In conclusion, del(1p32.3) is associated with short PFS and OS in patients with MM who received thalidomide- or bortezomib-based treatments.

Keywords

1p32.3 deletion / 1q21 gain / prognosis / multiple myeloma / FISH / bortezomib / thalidomide

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Acknowledgements

We would like to thank the patients who donated multiple myeloma specimens. This work was partially supported by the National Natural Science Foundation of China (Nos. 81400080 and 81470305) and Leukemia Research Innovation Team of Zhejiang Province (No. 2011R50015).

Compliance with ethics guidelines

Huanping Wang, Haitao Meng, Jinghan Wang, Yinjun Lou, Yile Zhou, Peipei Lin, Fenglin Li, Lin Liu, Huan Xu, Min Yang, and Jie Jin declare that they have no conflict of interest with regard to this work. All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2000 (5). Informed consent was obtained from all patients for being included in the study.

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