IL6 and rheumatoid arthritis: The RORC expression of RA T cells was induced by TGFβ + IL1β + IL6 and IL1β + IL23 (p < 0.01 and p < 0.01, respectively) (Figure 4B); while in case of the PsA T lymphocytes, the effective cytokine combinations were TGFβ + IL6 and TGFβ + IL1β + IL6 (p < 0.05 and p < 0.05, respectively) (Figure 4C).