IL6 and neoplasm: IL-6 was expressed in similar amounts in the bone marrow of all conditions examined: tumor-bearing mice injected with either MDA-MB-231GFP/Luc2 cells plus EO-231 cells (~ 27% of cells), MDA-MB-231GFP/Luc2 cells plus MC3T3-E1 cells (~ 40% of cells), or MDA-MB-231GFP/Luc2 cells alone (~ 27% of cells) (Fig. 4).