A Phase Ib/II Trial of Neoadjuvant Zolbetuximab Plus Docetaxel, Oxaliplatin and S-1 Chemotherapy in Patients With Locally Advanced Gastric Cancer

"1. Neoadjuvant treatment~ : Zolbetuximab 800\*/600 mg/m2 Q3W on day (D) 1, Docetaxel 50 mg/m2 intravenously (IV) on D1, oxaliplatin 100 mg/m2 IV on D1, S-1 40 mg/m2 bid orally on D1-14, will be administered every three weeks for three cycles.~ (\*Loading dose of zolbetuximab (800 mg/m²) on C1D1, followed by subsequent doses of 600 mg/m² every 3 weeks)~2. Surgery~ : Total gastrectomy (TG) or distal gastrectomy (DG) accompanied with dissection of the D2 lymph node~3. Adjuvant treatment After 3-8 weeks from surgery, S-1 40/50/60 mg/m2 bid orally on D1-28 plus Zolbetuximab 600 mg/m2 on D1 and D22 will be administered every 6 weeks for 12 months as an adjuvant treatment."

1\. Neoadjuvant treatment : Zolbetuximab 800\*/600 mg/m2 Q3W on day (D) 1, Docetaxel 50 mg/m2 intravenously (IV) on D1, oxaliplatin 100 mg/m2 IV on D1, S-1 40 mg/m2 bid orally on D1-14, will be administered every three weeks for three cycles. (\*Loading dose of zolbetuximab (800 mg/m²) on C1D1, followed by subsequent doses of 600 mg/m² every 3 weeks) 2. Surgery : Total gastrectomy (TG) or distal gastrectomy (DG) accompanied with dissection of the D2 lymph node 3. Adjuvant treatment After 3-8 weeks from surgery, S-1 40/50/60 mg/m2 bid orally on D1-28 plus Zolbetuximab 600 mg/m2 on D1 and D22 will be administered every 6 weeks for 12 months as an adjuvant treatment.

1\. Neoadjuvant treatment : Zolbetuximab 800\*/600 mg/m2 Q3W on day (D) 1, Docetaxel 50 mg/m2 intravenously (IV) on D1, oxaliplatin 100 mg/m2 IV on D1, S-1 40 mg/m2 bid orally on D1-14, will be administered every three weeks for three cycles. (\*Loading dose of zolbetuximab (800 mg/m²) on C1D1, followed by subsequent doses of 600 mg/m² every 3 weeks) 2. Surgery : Total gastrectomy (TG) or distal gastrectomy (DG) accompanied with dissection of the D2 lymph node 3. Adjuvant treatment After 3-8 weeks from surgery, S-1 40/50/60 mg/m2 bid orally on D1-28 plus Zolbetuximab 600 mg/m2 on D1 and D22 will be administered every 6 weeks for 12 months as an adjuvant treatment.

1\. Neoadjuvant treatment : Zolbetuximab 800\*/600 mg/m2 Q3W on day (D) 1, Docetaxel 50 mg/m2 intravenously (IV) on D1, oxaliplatin 100 mg/m2 IV on D1, S-1 40 mg/m2 bid orally on D1-14, will be administered every three weeks for three cycles. (\*Loading dose of zolbetuximab (800 mg/m²) on C1D1, followed by subsequent doses of 600 mg/m² every 3 weeks) 2. Surgery : Total gastrectomy (TG) or distal gastrectomy (DG) accompanied with dissection of the D2 lymph node 3. Adjuvant treatment After 3-8 weeks from surgery, S-1 40/50/60 mg/m2 bid orally on D1-28 plus Zolbetuximab 600 mg/m2 on D1 and D22 will be administered every 6 weeks for 12 months as an adjuvant treatment.