This project addresses the need for new tools to detect and monitor rare cells in blood, such as circulating tumor cells. Breast and prostate cancer are the most common malignant cancers in women and men, respectively. Metastasis is the main threat in these cancers since it turns a curable local disease into a chronic lethal disease. With emerging new targeting therapies, there is an unmet clinical need for improved prognostication, treatment prediction and treatment monitoring, where circulating tumor cells enumeration have potential to become a valuable tool. But circulating tumor cells are very rare and the background of other blood cells is vast, which makes it extremely challenging to classify and count these cells. Researchers will develop acoustic whole-blood imaging flow cytometry in which circulating tumor cells are drawn out directly from blood using an acoustic field. This will enable unbiased imaging and enumeration of circulating tumor cells through a panel of fluorescent antibodies with minimal pre-treatment.