While tremendous strides continue in developing new targeted therapies to fight the primary tumor, focus on the mechanisms of cancer metastasis remains challenging.  New technologies are bringing a fresh view into tumor metastasis. The spread of cancer is strongly driven by circulating metastatic cancer cell clusters (MCCCs), that differ from the primary tumor in many ways. Our proprietary technology is capable of capturing and illuminating MCCCs, thus providing a window into the hidden and deadly mechanism of cancer metastasis.