title: [Clinicopathologic significance of chromosome 17 polysomy in breast cancer].
abstract: OBJECTIVE
  To investigate the clinicopathological significance of chromosome 17 polysomy in breast cancer.
  
  
  METHODS
  Retrospective study of 200 cases of breast cancer including 106 cases of invasive ductal carcinoma and 94 cases of in-situ carcinoma was performed by fluorescence in-situ hybridization (FISH) to explore the relationship between chromosome 17 polysomy and age, nuclear atypia, lymphatic metastasis, HER2 gene amplification and HER2 protein expression.
  
  
  RESULTS
  Twenty-six percent (52/200) of chromosome 17 polysomy was detected in 200 cases of breast ductal carcinoma, all of which were invasive ductal carcinoma. Overall 52. 8% (52/180) of invasive ductal carcinoma cases showed chromosome 17 polysomy, which was correlated to HER2 gene amplification (P = 0.000) and HER-2 protein expression (P=0.000), and to HER2 expression combined with HER2 gene amplification (P=0.001). Chromosome 17 polysomy with or without HER2 gene amplification was also associated with high-grade nuclear atypia (P = 0.012 or P = 0.010) and lymphatic metastasis (P = 0.002 or P = 0.009 ). However, chromosome 17 polysomy with or without HER2 gene amplification was not correlative with the age of patients (P = 1. 000 or P = 0. 415).
  
  
  CONCLUSIONS
  Chromosome 17 polysomy may be related to the nuclear atypia, metastasis, HER2 gene amplification of invasive ductal carcinoma and thus a worse prognosis of the patients.
authors.affiliation: Department of Pathology, Chinese People's Liberation Army (PLA) General Hospital, Beijing 100853, China.
authors.forename: Ya-li
authors.initials: YL
authors.lastname: Lü
authors.forename: Mei
authors.initials: M
authors.lastname: Zhong
authors.forename: Lin
authors.initials: L
authors.lastname: Liu
authors.forename: Li-xin
authors.initials: LX
authors.lastname: Wei
authors.forename: Po
authors.initials: P
authors.lastname: Zhao
mesh_terms: D001943:Breast Neoplasms / Q000235:genetics* / Q000473:pathology; D044584:Carcinoma, Ductal / Q000235:genetics*; D002869:Chromosome Aberrations; D002886:Chromosomes, Human, Pair 17 / Q000235:genetics*; D005784:Gene Amplification; D018628:Gene Dosage; D015972:Gene Expression Regulation, Neoplastic / Q000235:genetics; D018734:Genes, erbB-2 / Q000235:genetics*; D006801:Humans