TRIM21 and synovial sarcoma: C-reactive protein (CRP), erythrocyte sedimentation rate (ESR), immunoglobulins G, A, M (IgG, IgA, IgM), antinuclear antibodies (ANA), anti-Ro52 antibodies (Anti-Ro52), anti-SSA antibodies (Anti-SSA), and anti-SSB antibodies (Anti-SSB) constitute the primary laboratory parameters utilized for the clinical diagnosis of SS [27].