PECAM1 and breast carcinoma: Our results from the analyses of GSL surface profiles confirm the presence of the GD2 positive subpopulation in cell lines with the mesenchymal phenotype (HMLE-EMT, MCF10A LXSN V12), however, breast cancer epithelial cells either of in vitro (T47D, SKBR3, MCF7) or clinical origin (EpCAM+/CD31-/CD45-/CD90-) were positive for GD2 as well.