IL10 and rheumatoid arthritis: Despite the results of Fu et al. (Fu et al., 2011) showing the hypermethylation of the anti-inflammatory IL10 gene in the PBMCs of RA patients, the results of Hernández-Bello et al. found an aberrant overexpression of the IL10 gene in these patients (Hernández-Bello et al., 2017).