The expression of NNMT in OXPHOS sensitive (WSU‐DLCL2, NCI‐H82, and G‐401), moderately sensitive (Daoy, U‐87MG, and U251MG), and resistant (786‐O, CFPAC‐1, and SF126) cancer cells was experimentally verified, which shows undetectable NNMT expression in OXPHOS sensitive cancer cells (Figure 3C,D). This evidence concerns the gene NNMT and cancer.