PMID- 24485403 OWN - NLM STAT- MEDLINE DCOM- 20140512 LR - 20140325 IS - 2210-7762 (Print) VI - 207 IP - 1-2 DP - 2014 Jan-Feb TI - Modified cIg-FISH protocol for multiple myeloma in routine cytogenetic laboratory practice. PG - 31-4 LID - S2210-7762(13)00168-3 [pii] LID - 10.1016/j.cancergen.2013.12.001 [doi] AB - The International Myeloma Working Group recommends that fluorescence in situ hybridization (FISH) be performed on specifically identified plasma cells (PC). This is because chromosomal abnormalities are not frequently detected by traditional karyotyping due to the low proliferative rate of PC in multiple myeloma (MM). Conventional FISH enhances the sensitivity but lacks the specificity, as it does not distinguish PC from other hematopoetic cells. To fulfill this recommendation, PC need to be selected either by flow cytometry or immunomagnetic bead-based PC sorting or by concomitant labeling of the cytoplasmic immunoglobulin light chain, which allows for unambiguous identification. These techniques require expertise, time, and funding and are not easily incorporated into the routine workflow of the cytogenetic laboratory. We have modified and refined the technique using fixed cell pellets to achieve nicely separated and easily identifiable PC. With immunostaining and subsequent FISH (i.e., cytoplasmic immunoglobulin FISH, cIg-FISH), this technique can be easily incorporated into every cytogenetic laboratory. Twenty samples from patients with MM were subjected to routine FISH, cIg-FISH, and chromosomal karyotyping and the results were compared. Three FISH probes, which enabled detection of the t(4;14), t(14;16) and deletion of TP53, were used to validate this modified technique successfully. CI - Copyright (c) 2014 Elsevier Inc. All rights reserved. FAU - Gole, Leena AU - Gole L AD - Department of Laboratory Medicine, National University Health Systems, Singapore. Electronic address: leena_gole@nuhs.edu.sg. FAU - Lin, Adeline AU - Lin A AD - Department of Haematology Oncology, National Cancer Institute of Singapore, Singapore. FAU - Chua, Constance AU - Chua C AD - Department of Laboratory Medicine, National University Health Systems, Singapore. FAU - Chng, Wee Joo AU - Chng WJ AD - Department of Haematology Oncology, National Cancer Institute of Singapore, Singapore. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20131227 PL - United States TA - Cancer Genet JT - Cancer genetics JID - 101539150 RN - 0 (Oligonucleotide Probes) SB - IM MH - Aged MH - Aged, 80 and over MH - Bone Marrow/pathology MH - Cell Proliferation MH - Cell Separation MH - Chromosome Mapping MH - Chromosomes, Human, Pair 14/ultrastructure MH - Chromosomes, Human, Pair 16/ultrastructure MH - Chromosomes, Human, Pair 4/ultrastructure MH - Flow Cytometry MH - Genes, p53 MH - Humans MH - In Situ Hybridization, Fluorescence/*methods MH - Middle Aged MH - Multiple Myeloma/*genetics/immunology MH - Oligonucleotide Probes/genetics MH - Plasma Cells/*cytology OTO - NOTNLM OT - Multiple myeloma OT - cytogenetic analysis OT - cytoplasmic immunoglobulin fluorescence in situ hybridization (cIg-FISH) OT - plasma cell EDAT- 2014/02/04 06:00 MHDA- 2014/05/13 06:00 CRDT- 2014/02/04 06:00 PHST- 2013/10/21 00:00 [received] PHST- 2013/11/29 00:00 [revised] PHST- 2013/12/16 00:00 [accepted] PHST- 2014/02/04 06:00 [entrez] PHST- 2014/02/04 06:00 [pubmed] PHST- 2014/05/13 06:00 [medline] AID - S2210-7762(13)00168-3 [pii] AID - 10.1016/j.cancergen.2013.12.001 [doi] PST - ppublish SO - Cancer Genet. 2014 Jan-Feb;207(1-2):31-4. doi: 10.1016/j.cancergen.2013.12.001. Epub 2013 Dec 27.