We have previously reported that 2F7 cells show chemotaxis towards human CXCL13 in vitro [18]; others have reported or inferred that murine CXCL13 can act on human CXCR5, and that human CXCL13 can induce proliferation of tumor cells in some cancers [32,33]. This evidence concerns the gene CXCL13 and cancer.