We examined the correlations between levels of cytokines related to the pathogenesis of RA (IL-2, IL-4, IL-6, IL-10, IL-17, IFN-γ, TNF-α) and T cell subsets and found positive associations with Tfr-like and mTfr-like cells for IL-2 (r = 0.343, p = 0.018; r = 0.385, p = 0.007, respectively), IL-4 (r = 0.478, p = 0.001; r = 0.435, p = 0.002, respectively), IL-17 (r = 0.295, p = 0.044; r = 0.316, p = 0.013 respectively), IFN-γ (r = 0.405, p = 0.005; r = 0.373, p = 0.010, respectively), and TNF-α (r = 0.397, p = 0.006; r = 0.379, p = 0.009, respectively). The gene discussed is IL4; the disease is rheumatoid arthritis.