In this regard, Tøndell et al. (9) demonstrated that bronchoalveolar lavage fluid (BALF) present in patients with sarcoidosis showed that the proportion of IFN-γ+ Th17 cells is greater than the controls, and also a positive correlation of IFN-γ+ Th17 cells with radiologic stage and Th1 cells. This evidence concerns the gene IFNG and sarcoidosis.