Masui et al. [19] found serum resistin levels significantly increased in patients with elevated right ventricular systolic pressure (RVSP) than in those with normal RVSP; the authors concluded that elevation of resistin levels is associated with proliferative obliterative vasculopathy, especially pulmonary arterial involvement leading to PAH. The gene discussed is RETN; the disease is pulmonary arterial hypertension.