SQSTM1 and inclusion body myositis: In contrast, the fraction of LC3- and p62-postive fibers (but not TDP-43-positive fibers) was significantly lower in the PM-COX group than in the IBM group (median: LC3, 26.8%FS; p62, 19.3%FS; TDP43, 10.8%FS) (p<0.01 for LC3 and p62, p>0.05 for TDP-43).