GDF15 and gastric cancer: In addition, based on information from TCGA and GEO datasets, the expression level of GDF‐15 mRNA may be of use for the diagnosis of GC, with a combined sensitivity, specificity and odds ratio of 0.69 (95% CI = 0.58–0.79), 0.90 (95% CI = 0.84–0.93) and 6.32 (95% CI = 4.22–9.49), respectively.