A 62-year-old woman with metastatic gastric adenocarcinoma (HER2-positive by IHC 3+ and FISH-positive) presents with ascites and hepatic metastases. She is chemotherapy-naïve and has good performance status (ECOG 0). Which agent should be added to the standard chemotherapy backbone (Cisplatin + 5-Fluorouracil) to improve her survival?

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