http://www.news-medical.net/news/20120113/New-imaging-probes-can-non-invasively-detect-breast-cancer-lymph-node-metastasis.aspx

Using two cell surface markers found to be highly expressed in breast cancer lymph node metastasis, researchers at Moffitt Cancer Center, working with colleagues at other institutions, have developed targeted, fluorescent molecular imaging probes that can non-invasively detect breast cancer lymph node metastasis. The new procedure could spare breast cancer patients invasive and unreliable sentinel lymph node (SLN) biopsies and surgery-associated negative side effects.