In patients with pulmonary sarcoidosis we detected an increased percentage of TREM-1+ CD14+ cells and MFI compared with HP patients and CG subjects in BALF: percentage (Figure 1(a))—sarcoidosis: median: 76.7, IQR: 21.2; HP: median: 29.9, IQR: 43.6; CG: median: 53.3, IQR: 35.89 (sarcoidosis versus HP: P < 0.001; sarcoidosis versus CG: P < 0.05). Here, TREM1 is linked to sarcoidosis.