These results support stability for up to 4 weeks post-reconstitution under our analysis conditions and under appropriate preparation and storage conditions (2-8°C). T-DXd is a blockbuster breast cancer therapy showing excellent results in many clinical trials, so for economic reasons, its use should be rationalized in the future.
In this cN + cohort, approximately one in six patients eligible for AST had residual disease only in the axilla. Less-invasive axillary staging procedures were associated with a low estimated theoretical risk of missed AST eligibility. However, these findings should be interpreted in light of the modest sample size.
HER2 expression in urothelial carcinoma was associated with a distinct immune microenvironmental profile characterized by Treg enrichment and relatively low immune checkpoint expression, as supported by our protein-level validation. These findings provide additional biological context for the potential therapeutic benefit of combining RC48 with ICIs. Given the exploratory nature of the HER2-high definition and the limited sample size of the validation cohorts, further prospective studies are warranted to confirm these observations.