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Infiltrating epitheliosis of the breast: characterization of histological features, immunophenotype and genomic profile

Eberle, Carey A; Piscuoglio, Salvatore; Rakha, Emad A; Ng, Charlotte K Y; Geyer, Felipe C; Edelweiss, Marcia; Sakr, Rita A; Weigelt, Britta; Reis-Filho, Jorge S; Ellis, Ian O


Carey A Eberle

Salvatore Piscuoglio

Professor of Breast Cancer Pathology

Charlotte K Y Ng

Felipe C Geyer

Marcia Edelweiss

Rita A Sakr

Britta Weigelt

Jorge S Reis-Filho



Infiltrating epitheliosis is a rare complex sclerosing lesion (CSL) of the breast, characterized by infiltrating ducts immersed in a scleroelastotic stroma and filled with cells having architectural and cytological patterns reminiscent of those of usual ductal hyperplasia. In this study we sought to define the molecular characteristics of infiltrating epitheliosis.

Methods and results

Eight infiltrating epitheliosis, adjacent breast lesions (one usual ductal hyperplasia, one papilloma, one micropapillary ductal carcinoma in situ and one low?grade adenosquamous carcinoma), and corresponding normal breast tissue from each case were microdissected and subjected to massively parallel sequencing analysis targeting all coding regions of 254 genes mutated recurrently in breast cancer and/or related to DNA repair. Mutations in components of the PI3K pathway were found in all infiltrating epitheliosis samples, seven of which harboured PIK3CA hotspot mutations, while the remaining case displayed a PIK3R1 somatic mutation.


Somatic mutations affecting PI3K pathway genes were found to be highly prevalent in infiltrating epitheliosis, suggesting that these lesions may be neoplastic rather than hyperplastic. The landscape of somatic genetic alterations found in infiltrating epitheliosis is similar to that of radial scars/CSLs, suggesting that infiltrating epitheliosis may represent one end of this spectrum of lesions.


Eberle, C. A., Piscuoglio, S., Rakha, E. A., Ng, C. K. Y., Geyer, F. C., Edelweiss, M., …Ellis, I. O. (2016). Infiltrating epitheliosis of the breast: characterization of histological features, immunophenotype and genomic profile. Histopathology, 68(7), 1030-1039.

Journal Article Type Article
Acceptance Date Oct 21, 2015
Online Publication Date Jan 7, 2016
Publication Date 2016-06
Deposit Date Nov 21, 2018
Journal Histopathology
Print ISSN 0309-0167
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 68
Issue 7
Pages 1030-1039
Public URL
Publisher URL