STAT3 and sarcoidosis: IL-27 and STAT3 were not dysregulated in sarcoid skin granulomas whereas STAT1 and STAT3 mRNA levels were elevated in the peripheral blood of sarcoidosis patients compared to healthy controls, but another group detected co-expression of the IL-27 subunits EBI3 and p28 (Figure 2) in epithelioid and multinucleate granuloma cells in sarcoid lymph nodes, suggesting a role of IL-27 in granuloma formation or resolution (Larousserie et al., 2004; Judson et al., 2012).