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HER2 FISH results in breast cancers with increased CEN17 signals using alternative chromosome 17 probes - reclassifying cases in the equivocal category

Holzschuh, Maria-Anna ; Czyz, Zbigniew ; Hauke, Sven ; Inwald, Elisabeth C. ; Polzer, Bernhard ; Brockhoff, Gero



Abstract

Aims: HER2 testing of invasive breast cancer by in-situ hybridization guides therapy decisions. Probing HER2 and centromere of chromosome 17 (cen17) simultaneously is supposed to reveal both a potential HER2 gene amplification and polysomy 17. However, a considerable number of breast cancer patients with quasi polysomy 17 are considered 'equivocal', which is diagnostically meaningless. Moreover, ...

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