D3L-001 showed preferential binding to HER2/CD47 double positive tumor cells as compared to CD47 single positive cells. D3L-001 showed better anti-tumor effect than trastuzumab in a panel of solid tumor models, including but not limited to BC and GC cell lines or patient derived xenografts....D3L-001 also...showed synergistic in vivo efficacy, when combining with Pertuzumab or Paclitaxel, in breast HCC1954, JIMT-1 and gastric cancer N87 models....D3L-001 will be further evaluated in clinic for its potential as a novel treatment option in HER2-positive BC, GC and other solid tumors.