CYP19A1 and gastric adenocarcinoma: Furthermore, through the single-cell RNA sequencing (scRNA-seq) analysis, the study highlighted Cytochrome P450 Family 19 Subfamily A Member 1 (CYP19A1) as the pivotal research target and detected its effect on cell proliferation by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) and the expression of ER stress-related genes by RT-qPCR in STAD.