Interventions: Drug: Fluorouracil (5-FU); Drug: Capecitabine; Biological: Durvalumab; Drug: Oxaliplatin; Biological: Trastuzumab; Drug: Trastuzumab deruxtecan; Drug: Cisplatin
Sponsors: AstraZeneca; Daiichi Sankyo Company, Limited 3-5-1 Nihonbashihoncho, Chuo-ku, Tokyo
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