Oil red O staining showed lots of mature adipose cells in the tumor tissues of the ASCs + 4T1/EPCs group (Figure 3(d)); however, H&E and CD-31 immunostaining of tissue sections revealed broad vascularization in the c-Kit+ASCs + 4T1/EPCs group, in contrast to the other groups (Figure 3(e)). This evidence concerns the gene PECAM1 and neoplasm.