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Gastric cancer is considered to be a type of gastrointestinal tumor and is mostly accompanied by Helicobacter pylori (HP) infection at the early stage

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Conclusion Within a specific range (358.7 pg/mL), serum vitamin B12 levels may modestly contribute to improved clinical pregnancy rates in women undergoing IVF-ET with the follicular-phase GnRH agonist protocol, though further validation is required to confirm its clinical significance