BTG3 and systemic lupus erythematosus: Investigations for systemic lupus erythematosus (SLE) were negative, with a negative Anti-Nuclear Antibody (ANA) and Anti-nDNA antibody test on the Extractable Nuclear Antigens (ENA) panel, which screens for various connective tissue diseases, was also negative, except for a single positive PO antibody, whose clinical significance was considered low in this context.