Identification of Autoantibodies Associated with Connective Tissue Disorders in Idiopathic Multicentric Castleman Disease (ASH 2023)
While anti-interleukin-6 (IL-6) therapy with siltuximab is effective in 34-50% of iMCD patients, disease pathophysiology remains largely unknown... IgG autoantibodies associated with CTDs, such as anti-Mi2, anti-SRP54, anti-La, anti-Ro, and anti-Histone 3; and ACAs, such as anti-OSM, anti-TNF, and anti-ITM2B were common in iMCD patients. While autoantibodies suggest autoimmune involvement, the presence of autoantibodies does not directly implicate autoimmunity as a pathological mechanism. For example, Hodgkin's disease and other post-infectious etiologies can present with elevated autoantibodies.