Journal
APPLIED IMMUNOHISTOCHEMISTRY & MOLECULAR MORPHOLOGY
Volume 30, Issue 10, Pages 681-686Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/PAI.0000000000001072
Keywords
uroplakin II; urothelial carcinoma; apocrine carcinoma; breast; staining pattern
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The staining pattern of UPII in breast carcinoma differs from that in urothelial carcinoma, offering a potential solution to diagnostic pitfalls in apocrine carcinoma.
Uroplakin II (UPII) has been shown as a highly specific marker of urothelial carcinoma; however, it can also stain subtypes of apocrine-differentiated breast carcinoma. Given that urothelium and breast epithelium share other common immunohistochemical markers, such as CK7 and GATA3, this can lead to a potential diagnostic pitfall. We stained a cohort of triple-negative breast cancer with UPII. Compared with the diffuse, cytoplasmic staining in urothelial carcinoma, UPII was positive in 38.9% of apocrine carcinoma (7/18) with a course, granular cytoplasmic staining pattern and negative in all nonapocrine triple-negative breast cancer cases. Furthermore, the same staining pattern was present in all apocrine metaplasia of the breast (4/4) and apocrine sweat glands in normal skin (6/6). This distinct subcellular localization of UPII staining in breast carcinoma can offer a potential solution to the above diagnostic pitfall.
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