To 'create space' for EBV-CTL growth after infusion in NPC patients we have already used a special protein called a CD45 antibody, which removes for a short period of time most of the patient's T cells. The preliminary results of this study is encouraging: the use of the CD45 antibody is safe and we observed enhanced EBV-CTL growth after infusion. In addition, all patients who has EBV-CTL growth had clinical responses.