Therefore, in this comprehensive meta-analysis, we analysed 14 studies (13 articles) with 2210 ovarian cancer patients, among these, 6 studies revealed that high expression of ALDH was associated with poor OS, 4 studies concluded that ALDH expression was positively correlated with DFS/PFS, and Deng et al. showed ALDH was unfavorable factors on both OS and DFS/PFS in ovarian cancer patients [12, 27–34]. This evidence concerns the gene LDHA and ovarian cancer.