PECAM1 and neoplasm: The expression of CD31 was stronger in tumors developed from LM3-shSlit3 cells when compared with that from LM3-shCTL cells, and weaker in tumors developed from Hep3B-Slit3 when compared with that from Hep3B-pcDNA, suggesting that Slit3 impaired the process of angiogenesis during the tumor growth process.