ICAM1 and neoplasm: ICAM1/GN-DU145 cells were able to form tumor tissue upon the neutralization of NK cells for 19 days after transplantation (Fig. 4 D), and interestingly, ICAM1/GN-DU145-derived tumor growth was continuously promoted, like GN-DU145-derived tumor growth, after the discontinuation of NK cell neutralization.