BTG3 and systemic lupus erythematosus: In 2019, the European League Against Rheumatism (EULAR)/American College of Rheumatology (ACR) developed new SLE classification criteria, including one obligatory entry criterion (positive antinuclear antibody (ANA)) followed by additional weighted criteria grouped into seven clinical (constitutional, hematologic, neuropsychiatric, mucocutaneous, serosal, musculoskeletal, and renal) and three immunologic (antiphospholipid antibodies, complement proteins, and SLE-specific antibodies) domains, weighted from 2 to 10 [5].