Thus, subgroup meta-analyses on the relationship between ZEB1-AS1 expression and OS were performed with regard to the following subgroups: tumor type (digestive system vs non-digestive system); sample size (<100 vs ≥100); NOS scores (7 vs 8); and HR data extraction method (derived from Kaplan–Meier curve vs directly obtained from the paper). This evidence concerns the gene ZEB1 and neoplasm.