In various embodiments, the present invention provides methods, compositions, dosing, and administration schedules for treatment of autoimmune diseases, including systemic erythematosus (SLE), for example, comprising administering to a patient in need of such treatment a TACI-Ig fusion molecule such as atacicept. In one embodiment, the TACI-Ig fusion molecule is administered in amount sufficient to slow, suppress or inhibit proliferation-inducing functions of BLyS and APRIL, in particular the use of multiple administrations of the fusion molecule at relatively low dose over the course of the treatment.
