IL17A and sarcoidosis: Some studies have shown that the IFN-γ+IL-17A+ subset, which is defined as the Th17.1 subset, is highly expressed in the BALF and lymph nodes of sarcoidosis patients compared with healthy controls in separate cohorts [33,34]; however, the IFN-γ+IL-17A+ subset in the peripheral blood did not differ between the patients who relapsed and those who were undergoing retreatment in this study.