Determining if a tumor is slow-growing or aggressive is important when choosing the right treatment to fight a given cancer. Magnetic resonance imaging (MRI) scans can help doctors identify the location of a tumor, but do not provide much further information.That may change with the development of a new MRI contrast agent that not only spots breast cancer tumors at early stages, but also differentiates between aggressive and slow-growing types of tumors.Read the story at Bioengineering Today: New MRI Contrast Agent Pinpoints Aggressive Breast Cancer Tumors.