CXCL12 and neoplasm: Since MMTV-ΔNβcat tumors also expressed high levels of SDF1, we treated ΔNβcat tumor-bearing mice with anti-SDF1 antibody and again saw a significant inhibition in average tumor growth (anti-GD group: 1,043 mm3 vs. anti-SDF1 group: 644 mm3; p = 0.001).