TF and brain cancer: The OR of brain cancer was 0.69 (95% CI, 0.48, 1.00; p = 0.05), 0.75 (95% CI, 0.59, 0.97; p = 0.03), 0.41 (95% CI, 0.20, 0.88; p = 0.02) and 1.49 (95% CI, 1.04, 2.14; p = 0.03) per one SD increment of serum iron, log10 ferritin, ferritin saturation and transferrin levels.