Data demonstrates that adding anti-CXCR4 neutralizing antibody to the 4 T1 and PyV MT tumor cells in the upper chamber had some effect on % migration, but in most instances the difference did not reach statistical significance (Figures 5C-E bar# 1 versus bar# 5, and Figures 5C-F bar# 3 versus bar# 6). This evidence concerns the gene CXCR4 and neoplasm.