Different antigenic targets of IgE have been described in several medical conditions, including systemic lupus, bullous pemphigoid, pemphigus vulgaris, autoimmune uveitis, rheumatoid arthritis, multiple sclerosis, autoimmune pancreatitis, which led to the new research field of IgE-mediated autoimmunity [108]. This evidence concerns the gene IGHE and rheumatoid arthritis.