CXCL13 and neoplasm: Interestingly, although compared to 4T1 and 4T1-pCDH, 4T1-CXCL13-1 or 4T1-CXCL13-2 tumors showed decreased growth rate, we did not observe complete tumor regression, which suggested attenuated antitumor activity of CXCL13 in BALB/cA-nu mice (Fig. 4A).