FGF23 and chronic kidney disease: Nam et al. [89], in a retrospective cohort study of 2089 patients with non-dialysis CKD, revealed that higher FGF23 levels are correlated with an increased risk of anemia, while Mehta et al. [90], in a prospective cohort study of 3869 individuals with mild to severe CKD, also noticed that higher levels of baseline FGF23 were strongly and monotonically associated with prevalent anemia.