Overall, at the borders of tumour cell dense to pre-existent tissue (defined as peritumoural area), PSMA expression colocalised with astrocyte endfeet, indicated from GFAP co-expression, and with perictyes, indicated from PDFGRb co-expression (Fig. 6) – these PSMA-positive astrocytes and pericytes were lining the microvessels. The gene discussed is GFAP; the disease is neoplasm.