In addition, for AST, a higher incidence rate of hospital mortality was found in patients belonging to the group with a higher value than normal only in the total PPH group (for total patients with PPH, ALB: p = 0.001; AST: p = 0.022; for patients with PPH and without liver disease, ALB: p = 0.001) (Table 4). This evidence concerns the gene ALB and pulmonary arterial hypertension.