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Lim AST, Krishnan S, Lim TH, See K, Ng YJ, Tan YM, Choo N, Lau LC, Tien SL, Ma J, Tan D. Amplification of 1q21 and other abnormalities in multiple myeloma patients from a tertiary hospital in singapore. Indian J Hematol Blood Transfus 2014; 30:253-8. [PMID: 25435723 DOI: 10.1007/s12288-013-0294-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2012] [Accepted: 08/17/2013] [Indexed: 01/21/2023] Open
Abstract
Much effort has been made to stratify multiple myeloma patients for targeted therapy. However, responses have been varied and improved patient stratifications are needed. Forty-five diagnostic samples from multiple myeloma patients (median age 65 years) were stratified cytogenetically as 15 having non-hyperdiploidy, 20 having hyperdiploidy and 10 having a normal karyotype. Fluorescence in situ hybridization (FISH) assays with FGFR3/IGH, CCND1/IGH, IGH/MAF, RB1 and TP53 probes on bone marrow samples showed that IGH rearrangements were the most common abnormality in the non-hyperdiploid group but these were also found among hyperdiploid patients and patients with normal cytogenetics. Of these, FGFR3/IGH rearrangements were most frequent. Deletion of RB1/monosomy 13 was the most common genetic abnormality across the three groups and was significantly higher among non-hyperdiploid compared to hyperdiploid patients. On the other hand, the study recorded a low incidence of TP53 deletion/monosomy 17. The FGFR3/IGH fusion was frequently seen with RB1 deletion/monosomy 13. FISH with 1p36/1q21 and 6q21/15q22 probes showed that amplification of 15q22 was seen in all of the hyperdiploid patients while amplification of 1q21, Amp(1q21), characterized non-hyperdiploid patients. In contrast, deletions of 1p36 and 6q21 were very rare events. Amp(1q21), FGFR3/IGH fusion, RB1 deletion/monosomy 13, and even TP53 deletion/monosomy 17 were seen in some hyperdiploid patients, suggesting that they have a less than favorable prognosis and require closer monitoring.
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Affiliation(s)
- Alvin S T Lim
- Cytogenetics Laboratory, Department of Pathology, Singapore General Hospital, The Academia-Diagnostics Tower, L9, 20 College Road, Singapore, 169856 Singapore
| | - Sathish Krishnan
- Department of Haematology, Singapore General Hospital, Singapore, Singapore
| | - Tse Hui Lim
- Cytogenetics Laboratory, Department of Pathology, Singapore General Hospital, The Academia-Diagnostics Tower, L9, 20 College Road, Singapore, 169856 Singapore
| | - Karen See
- Cytogenetics Laboratory, Department of Pathology, Singapore General Hospital, The Academia-Diagnostics Tower, L9, 20 College Road, Singapore, 169856 Singapore
| | - Yit Jun Ng
- Cytogenetics Laboratory, Department of Pathology, Singapore General Hospital, The Academia-Diagnostics Tower, L9, 20 College Road, Singapore, 169856 Singapore
| | - Yu Min Tan
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | - Natasha Choo
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | - Lai Ching Lau
- Cytogenetics Laboratory, Department of Pathology, Singapore General Hospital, The Academia-Diagnostics Tower, L9, 20 College Road, Singapore, 169856 Singapore
| | - Sim Leng Tien
- Cytogenetics Laboratory, Department of Pathology, Singapore General Hospital, The Academia-Diagnostics Tower, L9, 20 College Road, Singapore, 169856 Singapore ; Department of Haematology, Singapore General Hospital, Singapore, Singapore
| | - Jun Ma
- Faculty of Medicine, Nursing and Health Sciences, Monash University, Melbourne, VIC Australia
| | - Daryl Tan
- Department of Haematology, Singapore General Hospital, Singapore, Singapore
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