Regarding the gene chip dataset, the remarkable distinguishing ability of MAOA in the HCC patients and non‐cancer individuals was exhibited in GSE14520‐GPL571, GSE14520‐GPL3921, GSE29721, GSE45436, GSE112790, and GSE59259 (all with AUC >0.70 and P‐values <.05; Figure S8A‐I). Here, MAOA is linked to cancer.