PECAM1 and neoplasm: No significant difference in the extent of vascularization (CD31) (S2A and S2B Fig), perfusion (ratio FITC-lectin/CD31) (S2D Fig) or extravasated fibrinogen (ratio fibrinogen/CD31) (S2A–S2C Fig) was found between SG+/- and SG-/- primary tumours.