IL6 and atrial fibrillation: As expected, the frequency of CD14+HLA-DR–/low MDSC in both PB and ascites was inversely associated with RFS (log-rank test, p = 0.0215 and 0.0226; Figure 3A and Figure 3B); furthermore, we also found an inverse correlation between RFS and the levels of IL-6 and IL-10 in the AF (log-rank test, p = 0.0162 and 0.0175; Figure 3C and Figure 3D).