It has been well demonstrated that breast cancer cells express fragments of cytokeratin-19 (Moll et al, 1982; Brotheric et al, 1998; Sheard et al, 2002), which is one of the various kinds of cytokeratins comprising the intermediate filaments of the cytoskeleton (Moll et al, 1982). Here, KRT19 is linked to breast carcinoma.