FSTL1 and Cachexia: In cancer-induced cachexia, the levels of several myokines—including myostatin, IL-15, follistatin-related protein 1 (FSTL-1), fatty acid binding protein 3 (FABP3) and irisin—are elevated, suggesting that inhibition of myokines could be a therapeutical approach (de Castro et al., 2021).