Table 2 Serological frequencies in myositis subgroups
n (%)
PolymyositisDermatomyositisMyositis/CTD-overlap
Autoantibody status(n = 109)(n = 103)(n = 70)
Myositis-specific autoantibodies:
    Jo-127 (24.8)23 (22.3)8 (11.4)
    PL-71 (0.9)00
    PL-1201 (1.0)0
    EJ01 (1.0)0
    OJ1 (0.9)1 (1.0)1 (1.4)
    KS1 (0.9)1 (1.0)0
    Mi-21 (0.9)17 (16.5)0
    SRP5 (4.6)2 (1.9)0
    155/140019 (18.4)0
Myositis-associated autoantibodies
    U1-RNP5 (4.6)10 (9.7)19 (27.1)
    U3-RNP02 (1.9)2 (2.9)
    Ku02 (1.9)3 (4.3)
    PM-Scl5 (4.6)5 (4.8)19 (27.1)
None of the above autoantibodies63 (57.8)30 (29.1)20 (28.6)
  • SRP, signal recognition particle; CTD, connective tissue disease. Numbers do not add up to totals due to presence of patients with multiple autoantibodies.