That the combined analysis of CK5 and CK6 only increased the fraction of positive squamous cell carcinomas by 0–1% (average 0.1%) if compared to CK5 analysis alone and by 0–2% (average 0.5%) if compared to CK6 analysis alone does not provide strong evidence for superiority of using a combined CK5/6 antibody for the identification of squamous cell carcinomas, however. Here, KRT5 is linked to squamous cell carcinoma.