FST and sarcoidosis: In the sarcoidosis group we found statistically significant relationships between concentrations of Ang-2 and IL-8 (r = 0.62, P < 0.0001), follistatin and PECAM-1 (r = 0.76, p < 0.0001) as well as PDGF-BB and PECAM-1 (r = 0.82, p < 0.0001).