IFNG and interstitial lung disease: (22) reported that the proportion of IFN-γ+ Th17.1 cells in BALF was higher in sarcoidosis patients than in healthy participants, and there was no significant difference between the proportion of these cells in sarcoidosis patients and in patients with other ILDs, including hypersensitivity pneumonitis (HP), IPF, connective tissue disease-associated ILD (CTD-ILD), and an unspecified ILD, and an increased ratio of lung Th17.1 cells to Tregs in sarcoidosis patients, compared with patients with other ILDs or healthy participants.