Lavoie et al. reported an increased TCTP expression in lung tissue sections from patients with PAH and an hyperproliferation of blood outgrowth endothelial cells (BOECs) isolated from patients with PAH overexpressing TCTP [48], suggesting a potential role for TCTP in the hyperproliferation observed in PAH. The gene discussed is TPT1; the disease is pulmonary arterial hypertension.