Mitapivat (Pyrukynd®), an oral, allosteric activator of
pyruvate kinase (PK), is approved in the USA for the treatment of
haemolytic anaemia in adults with
PK deficiency and in the EU and UK for the treatment of
PK deficiency in adults.
Mitapivat acts by restoring activity of the red blood cell (RBC) PK
enzyme, which is dysfunctional due to genetic mutations in the PKLR gene in patients with
PK deficiency. In the double-blind placebo-controlled phase III ACTIVATE trial in adults with
PK deficiency who were not regularly RBC transfused,
mitapivat was superior to placebo in improving haemoglobin levels. In the single-arm phase III ACTIVATE-T trial in adults with
PK deficiency who were regularly RBC transfused, a reduction in RBC transfusion burden was observed with
mitapivat. In both trials,
mitapivat improved other clinical parameters of
haemolysis and patient-reported health-related quality of life. At the approved twice-daily dosage range,
mitapivat was generally well tolerated, with adverse events generally being mild to moderate in severity. Results from an ongoing extension study in previously enrolled phase III trial patients will be of interest. Currently available data indicate that
mitapivat, the first approved disease-modifying
drug for
PK deficiency in adults, is a valuable treatment option for this
rare disease.