We have confirmed from their Western blot and immunohistochemistry results that METCAM is not expressed in MCF-7 cells (0%), very weakly expressed in SK-BR-3 cells (5%), and weakly expressed, though slightly higher levels than the above two cells lines, in the human mammary cancer cell lines, MDA-MB-231 (a low metastatic cell line) (16%), and MDA-MB-468 (a high metastatic cell line) (22%), as shown in Figure 7. Here, MCAM is linked to breast cancer.