CD34 and neoplasm: Furthermore, in all examined types of BCCs (apart from nodular BCC), the morphological pattern of tumor stroma differentiation and its absence of CD34 extravascular positivity may be comparable with the pattern of CD34 expression and morphology of papillary dermis underlying neighboring epidermis, so the tumor stroma of BCCs may be seen as an “exaggerated” variant of papillary dermis.