IL6 and neoplasm: Consequently, we investigated IL‐6 in the sera of mice at the end stage of disease and found that IL‐6 levels were unchanged in tumor control or Zol‐treated mice, but were significantly reduced in mice treated with either 1D11 alone or 1D11 in combination with Zol (p ≤ 0.05 and p ≤ 0.001, respectively) (Fig. 3B v).