KRT5 and squamous cell carcinoma: Notably, the squamous lineage of these lesions is identical to squamous carcinomas in other anatomical locations and its hallmark is the robust positive staining for p63 (Uramoto et al. 2010), p40, and K5/14 in all cases, with coexpression of the EGFR in 94.7%, and variable staining for the squamous keratins K10/13.