1869TiP A phase II, multicenter, open-label study evaluating trastuzumab deruxtecan (T-DXd) for the treatment of select HER2-expressing solid tumors (DESTINY-PanTumor02)

Abstract

Human epidermal growth factor receptor 2 (HER2) is an established therapeutic target in both breast and gastric cancer. However, HER2-targeting therapies are not approved beyond these malignancies despite a high prevalence of HER2 expression across cancers of epithelial origin. T-DXd is an antibody-drug conjugate consisting of an anti-HER2 antibody, a cleavable tetrapeptide-based linker, and a topoisomerase I inhibitor payload. In a cohort of pretreated patients with multiple HER2-expressing tumors, T-DXd demonstrated promising antitumor activity, with an investigator-assessed confirmed objective response rate of 40.9% (9 of 22 patients) and median progression-free survival of 11.1 months (95% CI, 5.4-20.5 months; Tsurutani J, et al.