ALT-P7 were administered in 27 patients...with HER2-positive advanced breast cancer. In 22 patients with response evaluation, disease control rate at 6 weeks of ALT-P7 treatment was 77.3%(17/22) and partial response was achieved in two out of fifteen patients with measurable lesion. The median PFS at doses from 2.4 to 4.8mg/kg was 6.2 months (95% CI 2.5-9.9 months).