Concept Image of ctDNA (Circulating Tumor DNA) (image) Hiroshima University Share Print E-Mail Caption ctDNA is a small piece of DNA released from dying cancer cells into the blood. Credit Jonathan Bailey, NHGRI (https://www.genome.gov/) Usage Restrictions This image may only be used with appropriate caption and credit. Share Print E-Mail 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.