METTL3 and thymic carcinoma: Interestingly, analysis of METTL3 protein staining intensity in epithelial cancer cells revealed an increase of intensity from types A/AB (score of intensity = 1) to types B1-B3 (score of intensity = 2), and reached a maximum of intensity (score = 3) in thymic carcinoma cases (C) (Fig. 1C).