Additional file 4.
OSCC with sarcomatoid component, Case 1. A, Slide overview and magnified insert illustrate the morphology of the primary tumor in case #1 (haematoxylin & eosin). B, Staining with AE1/AE3 cytokeratin cocktail results in strong labeling of the squamous component (arrow), weak-absent labeling of the sarcomatoid component (arrowheads) and absence of labeling in the stroma (asterisk).
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Schwock et al. BMC Clinical Pathology 2010 10:1 doi:10.1186/1472-6890-10-1