Mixed apocrine/endocrine ductal carcinoma in situ of the breast coexistent with lobular carcinoma in situ
- 1Department of Pathology, South Manchester University NHS Trust, Withington Hospital, Nell Lane, Manchester M20 2LR, UK
- 2Department of Surgery, Withington Hospital
- 3Department of Pathology Mater Hospital, Eccles Street, Dublin 7, Ireland
- Dr Coyne JOHN.COYNE{at}man.ac.uk
- Accepted 19 April 2000
Abstract
An unusual mixed form of ductal carcinoma in situ (DCIS) of the breast is described, which exhibits a biphenotypic morphology encompassing a range of differential diagnostic DCIS subtypes. In adddition, immunophenotypic and ultrastructural studies demonstrate neuroendocrine and apocrine differentiation, raising questions regarding appropriate classification and biological behaviour. In two cases, coexistence of this mixed form of DCIS with lobular carcinoma in situ (LCIS) in the same duct lobular units is an additional unusual feature that might, at least in some cases, indicate a closer relation between them.
