CDH1 and choroid plexus papilloma: Concerning the expression of E-cadherin, Figarella-Branger et al. [20] reported that anti-E-cadherin immunoreactivity (British Biotechnology Products, clone HEC1) was observed on the basolateral part of most adult CPE in the third and fourth ventricles in surgically removed tissues diagnosed as benign ependymoma and benign choroid plexus papilloma.