IL6 and neoplasm: In parallel, multiplex mouse cytokine serum analyses conducted from the above mouse studies identified only IL-6 from the 32 measured cytokines to be significantly increased in the serum from H1792ΔSTK11 tumor–bearing mice when compared with serum from mice bearing parental H1792 (Figure 4L) or H1792ΔGFP (Figure 4M) control tumors.