Primo Vascular System: An Endothelial-to-Mesenchymal Potential Transitional Tissue Involved in Gastric Cancer Metastasis

Figure 4

Primo vessels were distinct from vascular vessels and lymphatic vessels. Weak CD31 fluorescence (an endothelium marker) was observed in primo vessels while strong CD31 expression was detected in vascular vessels. Furthermore, primo vessels negatively expressed LYVI-1 (a lymphatic endothelium marker).