Based on our results, 9 possible biomarkers were identified (IL-1β, IL-6, IL-8, IL-13, VEGF, angiogenin, C4a, RANTES, and MCP-1) out of 18 tested that significantly differ in the BALF of patients with HP and sarcoidosis. This evidence concerns the gene CXCL8 and hypersensitivity pneumonitis.