Systemic Lupus Erythematosus

TLDR: Contributions are gathered from physicians and researchers from North America, South America, Europe, and Asia that highlight several important and/or novel aspects of the molecular pathogenesis, clinical organ involvement, and experimental therapies in this prototypical systemic autoimmune disease.

Abstract: In sharp distinction to organ-specific autoimmune diseases such as thyroiditis, diabetes, or myasthenia gravis, systemic lupus erythematosus (SLE) is a constellation of signs and symptoms classified as one nosologic entity. Indeed, it is the diversity of presentation, accumulation of manifestations over time, and undulating disease course that challenge the most astute of clinicians. With rare exception, the unifying laboratory abnormality is the presence of circulating antinuclear antibodies (ANA). Acknowledging the complexity of this disease, its broad differential diagnosis, and the need to develop better and more specific therapies, the American College of Rheumatology (ACR) has designated 11 diagnostic criteria (presented in Table 15A-1) (1,2). These criteria reflect the major clinical features of the disease (mucocutaneous, articular, serosal, renal, neurologic) and incorporate the associated laboratory findings (hematologic and immunologic). The presence of four or more criteria is required for diagnosis. They need not necessarily present simultaneously: a single criterion such as arthritis or thrombocytopenia may recur over months or years before the diagnosis can be confirmed by the appearance of additional features. While there is incomplete agreement among rheumatologists as to whether these criteria need to be strictly applied in a practice setting, or reserved only for formal academic studies, they do facilitate a methodologic approach to evaluate a patient.