KRT15 (keratin 15) is a component of the intermediate filament network of the basal layer of stratified epithelia, and mutation in this gene results in epidermolysis bullosa simplex (EBS). This disorder is characterized by basal layer blistering due to cell fragility. The expression of this protein is elevated by interferon (IFN)-γ and thyroid hormone, and thus, they have potential as therapeutic agents for EBS. This protein is also expressed in a population of high-risk breast carcinomas. The expression pattern of this protein might be useful in differentiating trichoepithelioma (TE) from basal cell carcinoma (BCC).
