The Tn antigen appears in 90 percent of cancers and is associated with metastasis. Thus, it is a promising biomarker for identifying cancer cells and has become a very attractive target in therapies to fight cancer, according to Emilio José Cocinero, member of the UPV/EHU’s Department of Physical Chemistry and the Biofísika Institute, and one of the lead authors of the work. Antigens are molecules recognized by the immune system as a threat, which induce the formation of antibodies.