Additionally, interleukin family cytokines such as IL‐2, IL‐4, IL‐6, IL‐8, IL‐10, IL‐12p70, and tumor necrosis factor‐α (TNFα) are signatures of right ventricular failure in PAH patients (Elaine et al., 2010; Humbert et al., 1995). This evidence concerns the gene IL6 and pulmonary arterial hypertension.