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Distribution and significance of 14-3-3σ, a novel myoepithelial marker, in normal, benign, and malignant breast tissue

Simpson, Peter T. and Gale, Theodora and Reis-Filho, Jorge S. and Jones, Chris and Parry, Suzanne and Steele, Dawn and Cossu, Antonio and Budroni, Mario and Palmieri, Giuseppe and Lakhani, Sunil (2004) Distribution and significance of 14-3-3σ, a novel myoepithelial marker, in normal, benign, and malignant breast tissue. The Journal of Pathology, Vol. 202 (3), p. 274-285. eISSN 0022-3417. Article.

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DOI: 10.1002/path.1530


14-3-3σ is a candidate tumour suppressor gene transactivated by p53 in response to DNA damage. In gene expression analysis of normal luminal and myoepithelial cells, 14-3-3σ was preferentially expressed by myoepithelial cells. This study has analysed the immunohistochemical distribution and subcellular localization of 14-3-3σ in normal breast tissue and in a large series of benign and malignant breast lesions on whole tissue sections and by tissue microarray. Immunohistochemistry demonstrated that 14-3-3σ was consistently expressed in the cytoplasmic compartment and occasionally in the nuclei of myoepithelial cells arranged as a continuous layer around normal ducts and lobular units, whereas luminal epithelial, stromal, endothelial, pericytic, lipomatous, and neural cells showed no staining. Myoepithelial cells of benign proliferations and pre-invasive lesions were consistently positive for 14-3-3σ. Strong expression of 14-3-3σ was evident in one case of ductal carcinoma in situ (5.5%) and in 105/554 invasive cancers (18.9%). Survival data were available for 452 patients with invasive breast carcinoma. 14-3-3σ cytoplasmic subcellular localization was a statistically significant prognostic factor for the whole series of invasive carcinomas, as well as for those positive for oestrogen (ER) or progesterone receptors (PR). This analysis demonstrates the utility of 14-3-3σ as a new adjunct antibody for characterization of myoepithelial cells and myoepithelial lesions and it may be a novel prognostic factor for breast cancer patients.

Item Type:Article
ID Code:2530
Uncontrolled Keywords:14-3-3σ, breast cancer, myoepithelial cells, immunohistochemistry, myoepithelial carcinoma
Subjects:Area 06 - Scienze mediche > MED/08 Anatomia patologica
Divisions:002 Altri enti e centri di ricerca del Nord Sardegna > Azienda ASL1, Sassari > Centro multizonale di osservazione epidemiologica
001 Università di Sassari > 03 Istituti > Anatomia patologica
002 Altri enti e centri di ricerca del Nord Sardegna > CNR-Consiglio Nazionale delle Ricerche > Istituto di chimica biomolecolare, Sassari
Copyright Holders:© 2004 Pathological Society of Great Britain and Ireland
Deposited On:18 Aug 2009 10:08

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