The ongoing clinical trial (NCT04727151) is evaluating the safety and preliminary anti-tumor activity of TAC01-HER2 treatment of HER2+ solid tumors….In Phase II, dose expansion groups will further evaluate the efficacy, safety, and pharmacokinetics of the optimal TAC01-HER2 dose in gastric/GEJ tumors....For gastric/GEJ subjects of the same Cohorts, DCR was 83%. 3 months after TAC01-HER2 infusion, DCR was 33.3% for all subjects of Cohorts 2–4 and 50% for gastric/GEJ subjects. Two patients had a partial response (PR). At Cohort 4, a PR was observed in a subject with GEJ (HER2 2+, FISH+) with 100% reduction of target lesion.