AMACR and posterior cortical atrophy: In these cells, no expression of the PCa epithelial cell marker Alpha-methylacyl-CoA racemase (AMACR), epithelial cell adhesion molecule (EPCAM) and the mesenchymal cell marker Platelet-Derived Growth Factor Receptor β (PDGFR-β) was found, confirming their non-epithelial and non-mesenchymal origin.