Tumor-associated calcium signal transducer 2 (TROP2) is a transmembrane glycoprotein involved in different signaling pathways that promote proliferation, migration and invasion of tumoral cells, and its overexpression is associated with poor prognosis in multiple cancer types. Astellas Pharma Inc. has developed a TROP2-targeting antibody-drug conjugate (ADC), ASP-2998, and recently presented preclinical data on the candidate.