IntroductionThe gastric microbiota affects tumor development and treatment response, yet the characteristics and interactions of mucosal bacteria and fungi in advanced gastric cancer (AGC) remain unclear.MethodsHere we analyzed 177 mucosal samples (88 peritumoral and 89 tumoral) from 91 AGC patients in Northwest China using shotgun metagenomic sequencing.ResultsMetaPhlAn4 and Kaiju were used to annotate the gastric mucosal microbial composition. MetaPhlAn4 has identified 12 phyla (no phylum-leve