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High-grade encapsulated papillary carcinoma of the breast: an under-recognized entity

Rakha, Emad A.; Varga, Zsuzsanna; Elsheik, Somaia; Ellis, Ian O

Authors

EMAD RAKHA Emad.Rakha@nottingham.ac.uk
Professor of Breast Cancer Pathology

Zsuzsanna Varga

Somaia Elsheik



Abstract

Aims
Encapsulated papillary carcinoma (EPC) is a recognized special type of breast carcinoma. Despite compelling evidence indicating its invasive nature, although not of a conventional form, the current consensus is to manage EPC as an in‐situ disease, based on its indolent clinical behaviour. Although most EPCs are recognized to be of low and intermediate grade, a distinct proportion of these tumours do show high cytonuclear grade features. The existence and behaviour of these rare high‐grade variants remains to be defined. We aim to characterise these tumours and provide evidence to guide their management.

Methods and results
In this study, we have identified 12 high‐grade EPCs without associated conventional stromal invasion. To further characterize these high‐grade tumours, a series of invasive papillary carcinomas (n = 30) were assessed for the coexistence of EPC. The literature was also reviewed. Approximately 3% of pure EPCs showed high‐grade features as defined by nuclear pleomorphism and increased mitotic activity. These tumours not only showed histological features associated with aggressive behaviour, but were also often hormone receptor‐negative, tended to be of larger size, and were more frequently associated with stromal invasion. Of the 10 patients with follow‐up data, one with pure high‐grade EPC developed recurrence and died of her disease.

Conclusion
High‐grade EPC is rare, and its histological features and more aggressive clinical behaviour suggest that consideration should be given to managing it in a similar fashion to conventional forms of invasive breast carcinoma, based on established clinicopathological parameters.

Journal Article Type Article
Publication Date 2015-04
Journal Histopathology
Print ISSN 0309-0167
Electronic ISSN 1365-2559
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 66
Issue 5
Pages 740-746
APA6 Citation Rakha, E. A., Varga, Z., Elsheik, S., & Ellis, I. O. (2015). High-grade encapsulated papillary carcinoma of the breast: an under-recognized entity. Histopathology, 66(5), 740-746. doi:10.1111/his.12591
DOI https://doi.org/10.1111/his.12591
Publisher URL https://onlinelibrary.wiley.com/doi/full/10.1111/his.12591
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