The ROC curves revealed that PTX3 (AUCROC 0.866; 95% CI 0.757–0.974) was a more accurate marker of the presence of PAH than either CRP (AUCROC 0.518; 95% CI 0.333–0.704) or BNP (AUCROC 0.670; 95% CI 0.497–0.842; Figure 3). The gene discussed is CRP; the disease is pulmonary arterial hypertension.