Helicobacter pylori infection disturbs the tumor immune microenvironment and is associated with a discrepant prognosis in gastric de novo diffuse large B-cell lymphoma ======================================================================================================================================================================= * Yuwei Deng * Wenjia Su * Junwen Zhu * Hongfei Ji * Xiaoping Zhou * Jingshu Geng * Jiayu Zhu * Qingyuan Zhang