We conducted a study of plasma expression of microRNA hsa-miR-181a-5p, hsa-miR-194-5p, and hsa-miR-148a-3p, as well as three proteins—COQ10A, GAPDH1, and SDHC—in patients with an established diagnosis of myasthenia gravis in comparison with healthy volunteers. Here, SDHC is linked to myasthenia gravis.