In the study performed by Kerschan-Schindl et al., which included 24 women with RA in remission and compared their serum myostatin levels with 24 healthy control women [59], serum myostatin levels, obtained using colorimetric competitive immunoassay, were higher in age-matched healthy control patients than in RA patients in remission (according to the Clinical Disease Activity Index (CDAI), with a median of 1.0 (0.4–1.6)) (myostatin levels: 37.4 (29.9–44) ng/mL vs. 49.7 (45.3–57.3) ng/mL; p-value < 0.001) [59]. Here, MSTN is linked to rheumatoid arthritis.