KRT6A and cutaneous fibrous histiocytoma: Keratin 6a has been found to be overexpressed in the overlying epidermis of patients with dermatofibromas (Stoler et al. 1989), in keratinizing and nonkeratinizing squamous cell carcinomas of the cervix (Smedts et al. 1992), and in squamous cell carcinomas of the head and neck (Sesterhenn et al. 2005).