Others have found that inherited and acquired TET2 abnormalities occur in only 0.39% of pulmonary arterial hypertension (PAH) cases, but lower expression of TET2 in mononuclear cells was detected, with elevated pro‐inflammatory cytokines, in >86% of inflammation‐associated PAH cases (Potus et al., 2020). This evidence concerns the gene TET2 and pulmonary arterial hypertension.