Among methyltransferases, METTL14 mRNA displayed significant alteration in tumor (Additional file 1: Figure S2A), and yet its decrease could not explain the observed increase in global m6A. In concert with m6A hypermethylation, FTO and ALKBH5 mRNAs decreased in tumor tissues; however, they both increased under hypoxic conditions (Additional file 1: Figure S2A, B). This evidence concerns the gene FTO and neoplasm.