“…Not all malignant endothelial cells will be positive for this marker; thus, a panel of immunohistochemical stains should be used to avoid false-negatives. Diagnostically helpful stains include CD31, CD34, FLI-1, von Willebrand factor, and factor VIII [ 2 , 3 , 5 , 7 ]. In addition, numerous lymphatic associated antibodies have been developed, including podoplanin (D2–40), lymphatic vessel endothelial hyaluronan receptor-1 (LYVE-1), prospero homeobox protein 1, and vascular endothelial growth factor receptor 3 (VEGFR-3) [ 2 , 3 , 6 ].…”