Pharmacologic induction of fetal hemoglobin production.

Reactivation of fetal hemoglobin (HbF) expression is an important therapeutic option in adult patients with hemoglobin disorders. The understanding of the developmental regulation of γ-globin gene expression was followed by the identification of a number of chemical compounds that can reactivate HbF synthesis in vitro and in vivo in patients with hemoglobin disorders. These HbF inducers can be grouped in several classes based on their mechanisms of action. This article focuses on pharmacologic agents that were tested in humans and discusses current knowledge about the mechanisms by which they induce HbF.