In addition, METTL3 functions as an oncogene or a suppressor gene in many types of cancers by affecting different m6A levels of target RNAs (Cui et al., 2017; Vu et al., 2017; Chen et al., 2018; Cheng et al., 2019; Lan et al., 2019; Wanna-Udom et al., 2020). Here, METTL3 is linked to cancer.