Recent technological advances have led to the discovery that tumor cells invade, circulate, and metastasize as clusters of cells. The focus of our laboratory is to decipher the cellular and molecular mechanisms that explain this intriguing phenomenon. Through our studies, we aim to uncover the fundamental principles of collective migration, intercellular signaling, and multicellular drug resistance. Our ultimate mission is to guide the innovation of new therapies for metastatic breast cancer patients.