Next, the association between KIF15 mRNA expression level and the clinicopathological characteristics of patients with GC in TCGA database were analyzed. As shown in Fig. 6, KIF15 mRNA expression level was statistical correlated with age (P < 0.001, Fig. 6a) and histologic stage (P < 0.001, Fig. 6b), but not with gender, race, TNM classification, and pathologic stage (Additional file 2: Figure S1A–D). This evidence concerns the gene KIF15 and gastric cancer.