Cancer: Tumor Transition States (IMAGE) Université libre de Bruxelles Caption Researchers at the Université libre de Bruxelles define for the first time the tumor transition states occurring during cancer progression and identify the tumor cell populations responsible for metastasis. Credit ULB Cédric Blanpain 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.