- Subjects who have taken other immunomodulatory therapies within 2 months prior to Entry: systemic corticosteroids, immune globulin (IV gamma globulin, IVIG), interferons, interleukins, pentoxifylline (Trental), thalidomide, filgrastim (G-CSF), sargramostim (GM-CSF); dinitrochlorobenzene (DNCB), thymosin alpha 1 (thymosin alpha), thymopentin, inosiplex (Isoprinosine), polyribonucleoside (Ampligen), ditiocarb sodium (Imuthiol), any locally available immune modulators, and any other therapeutic or preventive HCC vaccine.