Treatment-naïve adult pts with histologically/cytologically confirmed metastatic ESCC (C6) or EAC (C7) were enrolled. Pts received the RP2D of OCI + TIS with cisplatin + 5-fluorouracil/paclitaxel until disease progression, intolerable toxicity, or consent withdrawal....ORRs by biomarker subgroups: C6, 100% in pts with PD-L1 tumor area positivity (TAP) score ≥10% (n=4) vs 76.9% in pts with PD-L1 TAP <10% (n=13); 80.0% in pts with TIGIT IC score ≥5% (n=10) vs 87.5% in pts with TIGIT IC <5% (n=8).