TROPION-Lung17 is a phase III, 2-arm, randomised, open-label, multicentre study, assessing the efficacy and safety of Dato-DXd compared with docetaxel in participants with previously treated trophoblast cell surface protein 2 (TROP2) normalised membrane ratio (NMR) positive advanced or metastatic non-squamous non-small cell lung cancer (NSCLC) without actionable genomic alterations (AGA), and to assess the clinical performance of the investigational in vitro diagnostic (IVD) device.