The exploratory analysis of the TROPION-Lung01 Phase III trial revealed that TROP2, quantified using AstraZeneca’s computational pathology platform (quantitative continuous scoring or QCS), can predict clinical outcomes in patients with advanced or metastatic non-small cell lung cancer (NSCLC) treated with datopotamab deruxtecan (Dato-DXd). This analysis highlighted a significantly greater efficacy of datopotamab deruxtecan in patients with TROP2-QCS biomarker positive tumors compared to docetaxel.
TROP2 is a protein found on and inside NSCLC tumor cells, but previous attempts to link TROP2 expression, assessed via conventional immunohistochemistry (IHC), to patient responses were unsuccessful. The QCS platform, however, provided a more precise measure of TROP2 expression, leading to better identification of patients likely to respond to TROP2-directed therapies like Dato-DXd.
In the TROPION-Lung01 trial, patients whose tumors were classified as TROP2-QCS positive (≥75% of tumor cells exhibiting a normalized membrane ratio below 0.56) showed improved progression-free survival (PFS). Among these patients, datopotamab deruxtecan reduced the risk of disease progression or death by 43% compared to docetaxel (median PFS 6.9 vs. 4.1 months). In the nonsquamous NSCLC subgroup without actionable genomic alterations,and with TROP2-QCS biomarker positive tumors this reduction was even more pronounced at 48%.
No new safety concerns were identified, and rates of severe treatment-related adverse events were comparable between the treatment arms. This analysis emphasizes the value of QCS in patient selection, offering insights into why certain patients respond better to TROP2-directed therapies and advancing the development of precision oncology treatments.