HSP90AA1 and sarcoidosis: HSP90α was detectable by ELISA in the BALF of sarcoidosis patients (35,595 ± 38,816 pg./mL, n = 14), and the HSP90α level in BALF was higher in severe patients compared with patients at lower chest stages (16,928 ± 7,173 vs. 45,966 ± 45,649 pg./mL, p = 0.042) (Figure 5A).