Sacituzumab tirumotecan in advanced non-small-cell lung cancer with or without EGFR mutations: phase 1/2 and phase 2 trials
Menée à partir de données d'essais de phase I/II et II incluant un total de 107 patients atteints d'un cancer du poumon non à petites cellules avec ou sans mutations EGFR et de stade avancé, cette étude évalue l'efficacité, du point de vue du taux de réponse objective, et la toxicité du sacituzumab tirumotécan (un conjugué anticorps-médicament ciblant TROP2)
Trophoblast cell-surface antigen 2 (TROP2)-directed antibody–drug conjugate (ADC) is a promising anticancer agent that has shown remarkable efficacy in several malignancies. However, in lung cancer, two phase 3 trials on TROP2-ADCs in unselected patients with advanced non-small-cell lung cancer (NSCLC) have both failed. Sacituzumab tirumotecan (sac-TMT) is a novel TROP2-directed ADC. Here we report the efficacy and safety of sac-TMT in previously treated, advanced NSCLC with or without activating EGFR mutations from the phase 1/2 KL264-01 and phase 2 SKB264-II-08 studies. Primary endpoint was objective response rate (ORR). KL264-01 enrolled EGFR-wild-type and EGFR-mutant NSCLC (n = 43). Confirmed ORR was 40% (17 of 43; 95% confidence interval (CI), 25–56). Median progression-free survival (PFS) was 6.2 months (95% CI, 5.3–11.3). Post-hoc subgroup analyses found better outcomes in the EGFR-mutant subset (22 of 43, 51%) with a confirmed ORR of 55% (12 of 22) and median PFS of 11.1 months. These findings were independently supported by results from SKB264-II-08, where sac-TMT led to confirmed ORR of 34% (22 of 64; 95% CI, 23–47) and median PFS of 9.3 months (95% CI, 7.6–11.4) in 64 patients with EGFR-mutant NSCLC. For a total of 107 patients receiving sac-TMT, the most common treatment-related adverse events were hematologic toxicities. Diarrhea (4%) and interstitial lung disease (1%) were uncommon. Exploration of potential mechanisms revealed that the presence of EGFR mutation substantially increased the internalization and activity of sac-TMT in vitro. Overall, sac-TMT showed encouraging single-agent activity and manageable tolerability in previously treated, advanced NSCLC with EGFR mutations. Randomized phase 3 trials in treatment-naive and previously treated patients with EGFR-mutant NSCLC are ongoing. ClinicalTrials.gov Identifiers: NCT04152499, NCT05631262.
Nature Medicine , résumé 2025