IL6 and atrial fibrillation: ILs are found in various cancer-induced cardiotoxicities, including hypertension, HF, and AF (Aoyagi and Matsui, 2011; Guo et al., 2012a,b), revealing elevated concentrations of pro-inflammatory cytokines, such as IL-6 and IL-2 (Fildes et al., 2009; Guo et al., 2012a).