Fig. 3From: Relationship between CK19 expression, deregulation of normal keratinocyte differentiation pattern and high risk-human papilloma virus infection in oral and oropharyngeal squamous cell carcinomaCK19 staining expression and localization in perilesional mucosa in HPV−/HPV+ cancers. a. CK19 expression is evident in basal and intermediate layer in dysplasia surrounding HPV−OSCC. b. Strong expression of CK19 in a basaloid OPSCC. Note the overhead mucosa with CK19 up-regulation and maturation disturbance. (LSAB-HRP, nuclear counterstaining with haematoxylin; original magnification a, x200; b, x40)Back to article page