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Erschienen in: Breast Cancer Research and Treatment 2/2011

01.09.2011 | Preclinical study

Molecular classification of breast phyllodes tumors: validation of the histologic grading scheme and insights into malignant progression

verfasst von: Mei Kim Ang, Aik Seng Ooi, Aye Aye Thike, Patrick Tan, Zhongfa Zhang, Karl Dykema, Kyle Furge, Bin Tean Teh, Puay Hoon Tan

Erschienen in: Breast Cancer Research and Treatment | Ausgabe 2/2011

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Abstract

Phyllodes tumors of the breast are rare fibroepithelial neoplasms with a potential for recurrence. Current histological classification is not always predictive of clinical behavior. The aim of this study was to identify genetic changes associated with the development of borderline and malignant phyllodes tumors in an Asian population, and to assess if genetic data supported the categorization of these tumors into the existing three grades of benign, borderline, and malignant. Expression profiling of 21 phyllodes tumors (6 benign, 10 borderline, 5 malignant) was performed using Affymetrix U133Plus 2.0 GeneChips®. Gene expression among benign, borderline, and malignant tumors was compared and a 29 gene list was able to classify them according to their histologic grade. Among these 29 genes are those responsible for matrix formation, cell adhesion, epidermis formation, and cell proliferation. Comparative genomic microarray analysis showed that the most common chromosomal alteration associated with borderline and malignant tumors was 1q gain, and an increasing number of chromosomal changes was noted with increasing histological grade. Upregulation of HOXB13 was seen in malignant relative to borderline phyllodes tumors and further investigated by immunohistochemistry in a corresponding set of formalin-fixed, paraffin-embedded tumors. HOXB13 protein overexpression was found to be correlated with stromal hypercellularity and atypia (P = 0.03, P = 0.039, respectively) and may be implicated in the development of malignant phyllodes tumors.
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Metadaten
Titel
Molecular classification of breast phyllodes tumors: validation of the histologic grading scheme and insights into malignant progression
verfasst von
Mei Kim Ang
Aik Seng Ooi
Aye Aye Thike
Patrick Tan
Zhongfa Zhang
Karl Dykema
Kyle Furge
Bin Tean Teh
Puay Hoon Tan
Publikationsdatum
01.09.2011
Verlag
Springer US
Erschienen in
Breast Cancer Research and Treatment / Ausgabe 2/2011
Print ISSN: 0167-6806
Elektronische ISSN: 1573-7217
DOI
https://doi.org/10.1007/s10549-010-1204-5

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