ICAM1 and neoplasm: RT has also been shown to stimulate tumor cell release of chemokines CXCL16 and CXCL10, to increase the expression of adhesion molecules E-selectin and ICAM-1 in endothelial cells and to upregulate major histocompatibility complex (MHC1), Fas, ICAM-1, and NKG2D ligands [15–21].