In studies that simultaneously investigated the reactivities to PPD, ESAT-6, and culture filtrate protein-10, IFN-ɣ release by peripheral blood mononuclear cells and bronchoalveolar lavage (BAL) cells in response to these M. tuberculosis antigens did not differ significantly between patients with sarcoidosis and those with control lung diseases [38,39]. Here, IFNA1 is linked to sarcoidosis.