In this context, the culture supernatants of cancer cells can trigger the expression of E- selectin by endothelial cells suggesting that cancer cells may release by themselves cytokines such as TNF-??, IL-?? or INF-?? that will directly activate endothelial cells to express E-selectin, P-selectin, ICAM-2 or VCAM. On the other hand, several studies further show that cancer cells may initiate the ex