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Survival curve for serum endostatin (ES) in pulmonary arterial hypertension (PAH). (A) Kaplan-Meier survival analysis of derivation cohort dichotomized by serum ES levels; n = 82, P = 0.001. (B) Kaplan-Meier survival analysis of a validation idiopathic PAH cohort; n = 50, P = 0.02.
