Estrogen Receptor and Signal Transducer and Activator of Transcription 3 Expression in Equine Mammary Tumors
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Hughes, K., Scase, T., & Foote, A. (2014). Estrogen Receptor and Signal Transducer and Activator of Transcription 3 Expression in Equine Mammary Tumors. Veterinary Pathology, 52 631-634. https://doi.org/10.1177/0300985814559400
Equine mammary tumors are uncommon, and relatively sparse histopathological and molecular data exists. The present study describes the histopathological features of seven such tumors, which exhibited infiltrative growth, intermediate to high mitotic rates, and focally extensive necrosis. The tumors exhibited variably strong staining for vimentin and cytokeratin 14, and frequently weak cytoplasmic staining for pan-cytokeratin. E-cadherin expression was strong. Interestingly, subgroups of the tumors exhibited strong nuclear staining for estrogen receptor α. Three of seven tumors exhibited nuclear expression of the transcription factor STAT3, suggesting that STAT3 was transcriptionally active. Rare to absent nuclear STAT3 expression was observed in carcinomas exhibiting moderate to intense staining for cytokeratin 14. This investigation confirms previous investigators’ assertions that equine mammary tumors have a malignant phenotype. A subset of the equine mammary tumors exhibited estrogen receptor α expression, suggesting that these tumors may potentially have similar molecular characteristics to their feline and canine counterparts.
Royal College of Veterinary Surgeons (RCVS) Charitable Trust (SG10 1185)
External DOI: https://doi.org/10.1177/0300985814559400
This record's URL: https://www.repository.cam.ac.uk/handle/1810/246136