 This treatment is commonly used agent in patients who require chronic treatment based on tolerance and efficacy.It may cause hypogammaglobulinemia (transient) requiring IVIgG replacement.Sirolimus (rapamycin, rapamune) which is a mTOR (mammalian target of rapamycin) inhibitor can be active in most patients and can in some cases lead to complete or near-complete resolution of autoimmune disease (>90%) With this treatment most patients have complete resolution of lymphoproliferation, including lymphadenopathy and splenomegaly (>90%) and have elimination of peripheral blood DNTs.