a strong trendP = 0.007
Following that, the DESTINY-Breast03 ( NCT03529110 ) phase III trial found that T-DXd as a second-line treatment for patients with HER2-positive MBC significantly improved PFS and had a strong trend of OS benefit (HR, 0.55; 95% CI, 0.36 to 0.86; P = 0.007) when compared to T-DM1 (HR, 0.28; 95% CI, 0.22 to 0.37; P < 0.001) [ 14 ].