Fig. 2From: Diagnostic and prognostic impact of cytokeratin 18 expression in human tumors: a tissue microarray study on 11,952 tumorsCytokeratin 18 (CK18) expression in tumors. The images show diffuse strong CK18 staining in a colorectal carcinoma (a), an invasive breast carcinoma of no special type (b), a clear cell carcinoma of the kidney (c), and a squamous cell carcinoma of the cervix uteri (d). CK18 immunostaining is focal in a squamous cell carcinoma of the larynx (e) and absent in another renal cell clear cell carcinoma (f)Back to article page