BDNF and idiopathic pulmonary arterial hypertension: Genes such as the CARD19 (c9orf89), PIK3C3, LINC00308 (C21orf74), SLC7A5P1 (LAT1-3TM), BDNF, NECAB1 (EFCBP1), ZNF221 usually had higher expression values in the IPAH patient group.