highly significantP = 7.8 × 10 -22
The median follow-up for T-DXd was 16.2 months; the median PFS was 6.8 months for the T-DM1 groups, while the median PFS had not been reached for the T-DXd group, with a highly significant difference (HR of 0.28, 0.22-0.37, P = 7.8 × 10 -22 ).