TRIM21 and myositis disease: Tests for anti-nuclear antibodies (ANAs), anti-double-stranded DNA (anti-dsDNA), and anti-extractable nuclear antigen antibodies (including anti-Jo-1, anti-PM-Scl 70, anti-PM-Scl 100, anti-Ku, anti-Ro-52, anti-SSA, anti-SSB, and anti-Sm) were negative, as were serology tests for myositis-specific antibodies (MSAs) (anti-Mi-2, -Jo1, -EJ, -PL-12, -PL-7, -SAE 1/2, -MDA5, -SRP, -HMGCR, -TIF-1γ, -SSA/Ro52, and -NXP-2).