Loss of IL-6 accelerates inflammation and lymphomagenesis in HBZ-Tg mice. (A) Incidence of dermatitis in WT (blue; n = 65), HBZ-Tg (yellow; n = 39), IL-6 KO (green; n = 72), and HBZ-Tg/IL-6 KO (red; n = 42) mice. These mice were observed for 1 y (log-rank test). (B) Overall survival of each strain: WT, n = 13; HBZ-Tg, n = 13; IL-6 KO, n = 14; HBZ-Tg/IL-6 KO, n = 24. These mice were observed for 2 y (log-rank test). (C) Incidence of lymphoma in each strain at age 24 wk. (D) Histopathological analysis of primary lymphoma in lymph node and spleen of an HBZ-Tg/IL-6 KO mouse. (E) Incidence of dermatitis in IL-6Rfl/fl (blue; n = 15), HBZ-Tg/IL-6Rfl/fl (yellow; n = 10), CD4-Cre/IL-6Rfl/fl (green; n = 7), and HBZ-Tg/CD4-Cre/IL-6Rfl/fl (red; n = 8) mice (log-rank test). (F) Incidence of dermatitis in IL-6Rfl/fl (blue; n = 20), HBZ-Tg/IL-6Rfl/fl (yellow; n = 14), LysM-Cre/IL-6Rfl/fl (green; n = 23), and HBZ-Tg/LysM-Cre/IL-6Rfl/fl (red; n = 17) mice (log-rank test).