NDN and breast cancer: Since Ndn was implicated as a germline metastasis susceptibility gene through an eQTL mapping approach in tumors derived from a mouse model of mammary tumorigenesis, we hypothesized that: a) the expression of human NDN in breast cancer is influenced by similar patterns of germline variation; and b) common variants in the human NDN gene are associated with markers of disease aggressiveness and clinical outcome in breast cancer.