- Use of any known immunomodulatory therapy within 4 weeks prior to study entry including but not limited to drugs such as systemic corticosteroids; interferons; interleukins; thalidomide; sargramostim (GM-CSF); dinitrochlorobenzene (DNCB); thymosin alpha 1 (thymosin alpha); thymopentin; inosiplex (Isoprinosine); polyribonucleoside (Ampligen); ditiocarb sodium (Imuthiol).