We explored the correlations between METTL7A differential expression and pan-cancer molecular subtypes from the TISIDB database and found that METTL7A was expressed differently in molecular subtypes of 7 cancer types, including COAD, ESCA, HNSC, LGG, pheochromocytoma and paraganglioma (PCPG), READ, and STAD. This evidence concerns the gene TMT1A and hereditary pheochromocytoma-paraganglioma.