MMP3 and myasthenia gravis: 15.3% of the patients in the MG group were MMP-3-positive (defined as higher than cut-off value 48 ng/mL) with very high mean MMP-3 concentration (79.9 ng/mL), whereas the proportion of MMP-3 positive patients in the MS (3.4%), epilepsy (6.7%), stroke (0%), and the control group (4.4%) was significantly lower.