A Study of KN026-based Combination Therapy in HER2-positive Gastric Cancer

Has received anti-tumor treatment such as systemic chemotherapy or other trial interventions within 28 days, or immunotherapy (e.g. interleukin, interferon, thymospipeptide, etc.), hormone therapy or targeted therapy within 14 days or 5 half-life (whichever is shorter) before randomization.

Participants with brain metastasis or spinal cord compression at screening (except for completed local treatment and discontinued glucocorticoids for at least 4 weeks before randomization , and stable central nervous system imaging and brain metastasis symptoms for at least 4 weeks).

Participants with PD-L1 CPS ≥1, who are receiving long-term immunotherapy (e.g., cyclosporine) or require daily systemic steroid therapy (e.g., >20 mg prednisone or equivalent), except those who treated with local glucocorticoids using nasal spray, inhalation, or other pathways.

Participants with PD-L1CPS ≥1, who have an active autoimmune disease or have a history of autoimmune disease 2 years before randomization and still require systemic treatment. However, participant with the following diseases is allowed to enroll: well-controlled type I diabetes, well-controlled hypothyroidism that requires hormone replacement therapy, skin diseases that do not require systemic treatment (such as vitiligo, psoriasis, or hair loss), or participant who is expected to not recur without external triggers.