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Immunotherapy combined with chemotherapy as first-line treatment for HER2-negative advanced gastric or gastroesophageal junction cancer: systematic review and Bayesian network meta-analysis based on specific PD-L1 expression levels

Crossref DOI link: https://doi.org/10.1186/s12885-026-16084-1

Published Online: 2026-05-06

Update policy: https://doi.org/10.1007/springer_crossmark_policy

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