Active SSc-PAH (SSc-PAH vs. IPAH: ATR1: 68.8/85.5 (0.772) Anti-ETAR: 72.5/85.5 (0.786)) (Non–SSc-PAH vs. SSc-PAH: ATR1: 68.8/78.0 (0.735) Anti-ETAR: 70.0/82.4 (0.754)). The gene discussed is EDNRA; the disease is pulmonary arterial hypertension.