36 Ligthfoot Ligthfoot HM HM Lark Lark A A Livasy Livasy CA CA Moore Moore DT DT Cowan Cowan D D Dressler Dressler L L Upregulation of focal adhesion kinase (FAK) expression in ductal carcinoma in situ (DCIS) is an early event in breast tumorigenesis Upregulation of focal adhesion kinase (FAK) expression in ductal carcinoma in situ (DCIS) is an early event in breast tumorigenesis Breast Cancer Res Treat Breast Cancer Res Treat 2004 2004 88 88 109 109 116 116 10.1007/s10549-004-1022-8 10.1007/s10549-004-1022-8 15564794 15564794. This evidence concerns the gene PTK2 and breast cancer.