CTC Cluster (IMAGE) Queensland University of Technology Caption Circulating tumor cell cluster found in the blood of a head and neck cancer patient. Credit Credit: QUT, Arutha Kulasinghe Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.