title: Aneuploidy of chromosome 20 in invasive breast cancer correlates with poor outcome.
abstract: Breast carcinoma is a genetically and phenotypically heterogeneous disease and is frequently associated with nonrandom chromosomal alterations. The aim of this study was to investigate the numerical aberrations of chromosome 20 in breast cancer. The observed chromosome-specific numerical abnormalities were evaluated along with the established clinicopathological parameters, the immunohistochemical expression of ER, PR, p53, c-erbB-2, Ki-67 and patients' survival. Nonisotopic in situ hybridization was applied to interphase cell nuclei on paraffin embedded tissue sections. Polysomy of chromosome 20 was the prevalent alteration in 45 of 50 (90%), monosomy in 2 of 50 (4%) and disomy in 3 of 50 (6%) cases. Invasive ductal carcinomas displayed a higher percentage of polysomy than lobular ones. A statistical significant association was demonstrated between Ki-67 immunohistochemical expression and polysomy of chromosome 20. Disomy was inversely correlated with Ki-67, while monosomy was suggestively associated with PR positive expression. Among the patients, those with the highest levels of polysomy showed the worst survival. In conclusion, the gain of chromosome 20 is the prevalent aberration in patients with breast carcinomas and may be useful prognostic marker in breast cancer.
authors.affiliation: Department of Pathology, Medical School, The National and Kapodistrian University of Athens, Greece. lnakopou@cc.uoa.gr
authors.forename: Lydia
authors.initials: L
authors.lastname: Nakopoulou
authors.forename: Ioanna
authors.initials: I
authors.lastname: Tsirmpa
authors.forename: Ioanna
authors.initials: I
authors.lastname: Giannopoulou
authors.forename: Dimitrios
authors.initials: D
authors.lastname: Trafalis
authors.forename: Sophia
authors.initials: S
authors.lastname: Katsarou
authors.forename: Panayiotis
authors.initials: P
authors.lastname: Davaris
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000782:Aneuploidy; D001943:Breast Neoplasms / Q000175:diagnosis* / Q000235:genetics* / Q000473:pathology; D002890:Chromosomes, Human, Pair 20 / Q000235:genetics*; D005260:Female; D006801:Humans; D017403:In Situ Hybridization; D008875:Middle Aged; D009361:Neoplasm Invasiveness / Q000235:genetics*; D011379:Prognosis