PECAM1 and neoplasm: Furthermore, similar analysis of the B16/PDGF-BB tumor vasculature with the widely used vascular markers CD31 (Figure 3G) and podocalyxin (data not shown) revealed an inhibitory effect of 1-NaPP1 on vessel density, length, branching and number of junctions as well as a significant increase in vascular lacunarity, thus corroborating the strong impact on the vasculature upon PDGFRβ signaling inhibition (Figure 3H-L).