HMGCR and inclusion body myositis: Regarding the other patients, 12/24 IBM presented anti-Cn1A Ab, 14/18 IMNM had either anti-HMGCR Ab (n = 12) or anti-SRP Ab (n = 2), ASyS patients all had anti-RNA synthetase Ab (anti-Jo1 n = 6, anti-PL7 n = 4), and 13/20 OM patients had autoantibodies (mainly anti-SmRNP n = 4, anti-Ku n = 3, anti-Scl70 n = 2; Table 3).