RETN and idiopathic pulmonary arterial hypertension: In multivariable Cox proportional hazards models (Table 2), the relationship between resistin levels and outcome remained significant in the overall cohort (HR, 2.6; 95% CI: 1.27–5.33; P < 0.0087) and in IPAH (HR, 3.29; 95% CI: 1.19–9.07; P < 0.0214) after adjusting for the following seven variables: age, gender, BMI, variables significant in the univariate analysis (RAP and mPAP) and NTproBNP.