Circulating tumor cells (CTCs) are a rare type of cancer cell that are found in the blood stream of patients with localized tumors. Successful separation of CTCs from blood could serve as a liquid biopsy to help diagnose cancer and monitor treatment progress. A deeper understanding of CTCs could also lead to a better understanding of the most deadly cancer process: metastasis, where cancer cells leave established tumors and migrate to other locations in the body.
Source: Sound waves separate rare cancer cells from blood
It’s a proof of concept.