SFTPD and acute respiratory distress syndrome: Biomarkers that reflect inflammation (IL-6, IL-8) [24], coagulation (plasminogen activator inhibitor-1, protein C, thrombomodulin) [25], endothelial cell injury (von Willebrand factor) [26], and epithelial cell injury [SP-D and receptor for advanced glycosylation end products (RAGE)] [27], have all been linked to increased disease severity and poorer clinical outcomes in patients with ARDS.