About PK Deficiency | For HCPs

PK Deficiency Overview

PK deficiency is an underrecognized red blood cell (RBC) disorder characterized by lifelong chronic hemolysis1,2

Because of the risk of serious long-term complications, a definitive diagnosis is essential for monitoring and management decisions.3

Signs and symptoms associated with lifelong chronic hemolysis1,3-8

Lab values

  • Low hemoglobin
  • High ferritin
  • Elevated bilirubin accompanied by jaundice
  • Reticulocytosis

Common symptoms

  • Extreme fatigue
  • Cognitive difficulties
  • Headache

Patients with PK deficiency are at risk for a range of complications, regardless of the degree of their anemia.4,8

It’s both an emotional and physical breakdown. When I’m tired, it means I’m dizzy and I need to hold on to steady surfaces; my brain is foggy, and I can’t focus. I can’t remember words, I have a headache, and my body is sore.

Tamara S., Minnesota

Currently 52 years old. Diagnosed with pyruvate kinase deficiency at the age of 6.

Potential complications pose long-term patient burden4,5,9

  • Aplastic crisis
  • Iron overload
  • Gallstones
  • Osteopenia and osteoporosis
  • Leg ulcers
  • Pulmonary hypertension
  • Splenomegaly

A Natural History Study of 254 patients demonstrated that patients with PK deficiency are at high risk of iron overload, regardless of their transfusion history4,8

38% of patients not receiving regular transfusions
experienced iron overload*†

*As defined by ferritin >1000 ng/mL or chelation.
†The average age in the Pyruvate Kinase Deficiency Natural History Study (NHS) was 19 years (range 0.1-69.9; n=254).
The Pyruvate Kinase Deficiency NHS was funded by Agios Pharmaceuticals.

A Natural History Study of 254 patients demonstrated that patients with PK deficiency are at high risk of iron overload, regardless of their transfusion history4,8

38% of patients not receiving regular transfusions experienced iron overload*†

*As defined by ferritin >1000 ng/mL or chelation.
†The average age in the Pyruvate Kinase Deficiency Natural History Study (NHS) was 19 years (range 0.1-69.9; n=254).
The Pyruvate Kinase Deficiency NHS was funded by Agios Pharmaceuticals.

*As defined by ferritin >1000 ng/mL or chelation.

†The average age in the Pyruvate Kinase Deficiency Natural History Study (NHS) was 19 years (range 0.1-69.9; n=254).

The Pyruvate Kinase Deficiency Natural History Study was funded by Agios Pharmaceuticals.

Prevalence estimates range from 3.2 to 8.5 Per million; actual prevalence may be higher due to missed diagnosis1,3,10,11

Challenges associated with diagnosing PK deficiency2,3,5,6

  • Wide variability in clinical presentation
  • Autosomal recessive inheritance
  • Limitations of diagnostic tests
  • Lack of familiarity among healthcare providers
  • Incomplete diagnostic algorithms

Hemolytic anemias in order of prevalence in the US12-19

US prevalence Condition
>1000 in
1,000,000		 G6PD deficiency
Hereditary spherocytosis
Sickle cell anemia
1 to 100 in
1,000,000		 Beta thalassemia
Pyruvate kinase deficiency
Paroxysmal nocturnal hemoglobinuria (PNH)
Extremely rare Triosephosphate isomerase deficiency
Hexokinase deficiency
Aldolase deficiency

PK deficiency inheritance pattern2

PK Deficiency Inheritance Pattern

Mutations in the PKLR gene are responsible for PK deficiency1,2,4,20

  • Autosomal recessive disorder; 1% to 3% of the population are believed to carry one defective copy of the PKLR gene
  • Over 370 mutations identified to date
  • In a recent study, approximately 35% of the pathogenic variants were previously unidentified
  • The majority of patients are compound heterozygous, contributing to clinical heterogeneity
  • Genotype does not always predict disease severity and patient outcomes
Patients with PK deficiency can be diagnosed at any age.
Among patients enrolled in the Pyruvate Kinase Deficiency Natural History Study, age at diagnosis ranged from 4 months to 60 years4,‡

‡Age-related data available for 243 of the 254 patients.

Explore the disease mechanism of PK deficiency

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Explore the disease mechanism
of PK deficiency

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References: 1. Grace RF, Zanella A, Neufeld EJ, et al. Erythrocyte pyruvate kinase deficiency: 2015 status report. Am J Hematol. 2015;90(9):825-830. 2. Zanella A, Fermo E, Bianchi P, Valentini G. Red cell pyruvate kinase deficiency: molecular and clinical aspects. Br J Haematol. 2005;130(1):11-25. 3. Bianchi P, Fermo E, Glader B, et al. Addressing the diagnostic gaps in pyruvate kinase deficiency: consensus recommendations on the diagnosis of pyruvate kinase deficiency. Am J Hematol. 2019;94(1):149-161 [supplementary online material]. 4. Grace RF, Bianchi P, van Beers EJ, et al. Clinical spectrum of pyruvate kinase deficiency: data from Pyruvate Kinase Deficiency Natural History Study. Blood. 2018;131(20):2183-2192. 5. Grace RF, Cohen J, Egan S, et al. The burden of disease in pyruvate kinase deficiency: patients’ perception of the impact on health-related quality of life. Eur J Haematol. 2018;101(6):758-765. 6. Grace RF, Mark Layton D, Barcellini W. How we manage patients with pyruvate kinase deficiency. Br J Haematol. 2019;184(5):721-734. 7. National Organization for Rare Disorders. Voice of the Patient Report: Pyruvate Kinase Deficiency. Washington, DC: National Organization for Rare Disorders; 2020. 8. van Beers EJ, van Straaten S, Morton DH, et al. Prevalence and management of iron overload in pyruvate kinase deficiency: report from the Pyruvate Kinase Deficiency Natural History Study. Haematologica. 2019;104(2):e51-e53. 9. Data on file. Agios Pharmaceuticals, Inc. Cambridge, MA. 10. Carey PJ, Chandler J, Hendrick A, et al; Northern Region Haematologists Group. Prevalence of pyruvate kinase deficiency in a northern European population in the north of England. Blood. 2000;96(12):4005-4006. 11. de Medicis E, Ross P, Friedman R, et al. Hereditary nonspherocytic hemolytic anemia due to pyruvate kinase deficiency: a prevalence study in Quebec (Canada). Hum Hered. 1992;42(3):179-183. 12. Nkhoma ET, Poole C, Vannappagari V, Hall SA, Beutler E. The global prevalence of glucose-6-phosphate dehydrogenase deficiency: a systematic review and meta-analysis. Blood Cells Mol Dis. 2009;42(3):267-278. 13. Perrotta S, Gallagher PG, Mohandas N. Hereditary spherocytosis. Lancet. 2008;372(9647):1411-1426. 14. Brousseau DC, Panepinto JA, Nimmer M, Hoffmann RG. The number of people with sickle-cell disease in the United States: national and state estimates. Am J Hematol. 2010;85(1):77-78. 15. World Health Organization, Thalassaemia International Federation. Management of haemoglobin disorders: report of a joint WHO-TIF meeting. November 16-18, 2007; Nicosia, Cyprus. 16. Centers for Disease Control and Prevention. Thalassemia awareness. https://www.cdc.gov/features/international-thalassemia/index.html. Reviewed April 15, 2020. Accessed April 21, 2020. 17. Secrest MH, Storm M, Carrington C, et al. Prevalence of pyruvate kinase deficiency: a systematic literature review [published online ahead of print April 12, 2020]. Eur J Haematol. 2020. doi:10.1111.ejh.13424. 18. Dingli D, Luzzatto L, Pacheco JM. Neutral evolution in paroxysmal nocturnal hemoglobinuria. Proc Natl Acad Sci U S A. 2008;105(47):18496-18500. 19. Koralkova P, van Solinge WW, van Wijk R. Rare hereditary red blood cell enzymopathies associated with hemolytic anemia—pathophysiology, clinical aspects, and laboratory diagnosis. Int J Lab Hematol. 2014;36(3):388-397. 20. Bianchi P, Fermo E, Lezon-Geyda K, et al. Genotype-phenotype correlation and molecular heterogeneity in pyruvate kinase deficiency. Am J Hematol. 2020;95(5):472-482.