Disclosed is the novel use of some Aza-podophyllotoxin derivatives (AZPs) for modulation of the immune system (immunomodulation), including a method for modulating an immune response comprising administering to a subject an effective amount of at least one Aza-podophyllotoxin derivative of general formula wherein A-ring is selected from the group consisting of 1,3-dioxolane, cyclopentane, 1,4-dioxane, one methoxy, two methoxys, and ethyl and wherein E-ring is selected from the group consisting of dimethoxyanisole, veratrol, anisole, benzene, syringol, bromobenzene, chlorobenzene, 1,2-dichlorobenzene, 2,3-dimethoxybenzene, 3,4,5-trimethoxybenzene.
