Ovarian Cancer Progression (IMAGE) Virginia Tech Caption After multiple rounds of fluid shear stress exposure, human cells in the study began to form tumor-like structures known as spheroids (pictured). Spheroids are indicative of aggressive disease traits. Credit Virginia Tech 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.