Most cells in the body send out little messengers called extracellular vesicles that carry proteins, lipids, and other bioactive molecules to other cells, playing an important role in intercellular communication. But healthy cells are not the only ones that rely on extracellular vesicles. Cancer cel ls do, too. Small extracellular vesicles that are shed from tumor cells contribute to how cancer spreads to healthy tissue. ...read more read less