SNRPD1 and systemic lupus erythematosus: The results indicated that 19.00% and 29.59% of naive SLE and non-naive SLE patients had no anti-SmD1, anti-Sm and anti-dsDNA autoantibodies, respectively, whereas 24.00% of 100 naive SLE patients and 16.57% of the 169 non-naive SLE were positive for all three tested autoantibodies.