Histological appearance of basal tumours and CK14 expression patterns. (a) Typical histological appearance of a basal breast carcinoma (haematoxylin and eosin). (b) CK14 expression: a basal tumour with basal keratin expression in almost every tumour cell (diffuse staining pattern). (c) Another basal tumour with only a minority of tumour cells showing expression (focal staining pattern).
Fulford et al. Breast Cancer Research 2007 9:R4 doi:10.1186/bcr1636