PECAM1 and neoplasm: PC3 tumours show little CD31 VF or Hoechst uptake on average (Figure 3B) and these parameters are uncorrelated (r=0.25, p=0.21, n=25); conversely, LNCaP tumours show high CD31 VF and Hoechst uptake, which are positively correlated (r=0.63, p=0.02, n=14).