EPAS1 and pulmonary arterial hypertension: We next tested the classification power of the 14 HIF2α-mediated GO terms in distinguishing PAH patients from controls in two validation lung transcriptome data sets: the cohort A (GEO accession: GSE15197; Rajkumar et al., 2010) containing 13 controls and 18 PAH patients and the cohort B (GEO accession: GSE53408; Zhao et al., 2014) with 11 controls and 12 PAH patients.