In order to investigate the effect of versican G3 on breast cancer cell growth and metastasis, we first characterized the expression of versican in murine mammary epithelial tumor cell lines 67NR, 66c14, 4T07, and 4T1, which were derived from a single spontaneous arising mammary tumor from Balb/cfC3H mice [38]. This evidence concerns the gene VCAN and breast cancer.