ALDH18A1 and neoplasm: In addition, we further verified the expression of ALDH18A1 mRNA in different tumour tissues and normal tissues using the Gene Expression Profiling Interactive Analysis (GEPIA) online database110,111, and the results showed that the expression of ALDH18A1 was upregulated in 16 types of tumour tissues compared to that in normal tissues (Figure 5(B)).