METTL14 and cervical cancer: METTL14, also an oncogene in cervical cancer, enhanced its m6A methylation levels by being mediated by piRNA-14633 (PIWI-interacting RNA-14633) to activate the piRNA-14633/METTL14/CYP1B1 axis which promoting the proliferation, invasion and metastasis of cervical cancer cells (27).