title: A retrospective analysis of cytogenetic alterations in patients with newly diagnosed multiple myeloma: a single center study in Korea.
abstract: BACKGROUND
  The accurate identification of cytogenetic abnormalities in multiple myeloma (MM) has become more important over recent years for the development of new diagnostic and prognostic markers. In this study, we retrospectively analyzed the cytogenetic aberrations in MM cases as an initial assessment in a single institute.
  
  
  METHODS
  We reviewed the cytogenetic results from 222 patients who were newly diagnosed with MM between January 2000 and December 2015. Chromosomal analysis was performed on cultured bone marrow samples by standard G-banding technique. At least 20 metaphase cells were analyzed for karyotyping.
  
  
  RESULTS
  Clonal chromosome abnormalities were detected in 45.0% (100/222) of the patients. Among these results, 80 cases (80.0%) had both numerical and structural chromosome abnormalities. Overall hyperdiploidy with structural cytogenetic aberrations was the most common finding (44.0%), followed by hypodiploidy with structural aberrations (28.0%). Amplification of the long arm of chromosome 1 and -13/del(13q) were the most frequent recurrent abnormalities, and were detected in 50 patients (50.0%) and 40 patients (40.0%) with clonal abnormalities, respectively. The most common abnormality involving 14q32 was t(11;14)(q13;q32), which was observed in 19 cases.
  
  
  CONCLUSIONS
  These findings demonstrate that myeloma cells exhibit complex aberrations regardless of ploidy, even from a single center in Korea. Conventional cytogenetic analysis should be included in the initial diagnostic work-up for patients suspected of having MM.
authors.affiliation: Department of Laboratory Medicine, Dong-A University College of Medicine, Busan, Korea.
authors.forename: Shuhua
authors.initials: S
authors.lastname: Li
authors.affiliation: Department of Laboratory Medicine, Dong-A University College of Medicine, Busan, Korea.
authors.forename: Hyeon-Ho
authors.initials: HH
authors.lastname: Lim
authors.affiliation: Department of Laboratory Medicine, Dong-A University College of Medicine, Busan, Korea.
authors.forename: Kwang-Sook
authors.initials: KS
authors.lastname: Woo
authors.affiliation: Department of Internal Medicine, Dong-A University College of Medicine, Busan, Korea.
authors.forename: Sung-Hyun
authors.initials: SH
authors.lastname: Kim
authors.affiliation: Department of Laboratory Medicine, Dong-A University College of Medicine, Busan, Korea.
authors.forename: Jin-Yeong
authors.initials: JY
authors.lastname: Han
keywords: Chromosome abnormalities; Cytogenetics; Multiple myeloma