PGM5P4 and breast carcinoma: We read with great interest the recent article by Wu et al., “Downregulation of the lncRNA PGM5P4-AS1 predicts poor prognosis and drives breast cancer progression through miR-3664-5p/KLF9.”1 The authors present compelling evidence identifying PGM5P4-AS1 as a potential prognostic biomarker.