The effect of long-term danazol treatment on haematological parameters in hereditary angioedema Rare immune deficiencies

Kinga Viktória Kohalmi, Nóra Veszeli, Zsuzsanna Zotter, Dorottya Csuka, Szabolcs Benedek, Éva Imreh, Lilian Varga, Henriette Farkas

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6 Citations (Scopus)


Background: The 17-alpha-alkylated derivatives of testosterone are often used for the prevention of oedematous episodes in hereditary angioedema with C1-inhibitor deficiency (C1-INH-HAE). However, these agents can have many adverse effects, including erythrocytosis and polyglobulia. Our aim was to investigate occurrence of erythrocytosis and polyglobulia after long-term danazol prophylaxis in C1-INH-HAE. Methods: During the initial stage of our retrospective study, we explored whether C1-INH-HAE is associated with susceptibility to erythrocytosis and/or polyglobulia. In the second stage, we analyzed the haematological parameters of 39 C1-INH-HAE patients before, as well as after treatment with danazol for 1, 3, or 5 years. In the third stage, we studied the incidence of erythrocytosis and of polyglobulia after dosing with danazol for more than 5 years. Results: We did not find any significant difference between C1-INH-HAE patients not receiving danazol and healthy controls as regards the occurrence of erythrocytosis or polyglobulia. The haematological parameters did not change after treatment with danazol for 1, 3, or 5 years. Platelet count was an exception-it decreased significantly (p = 0.0115) versus baseline, but within the reference range. Treatment-related polyglobulia did not occur. We observed erythrocytosis in a single female patient after 1-year-and in three female patients after more than 5-year long-treatment with danazol. Erythrocytosis did not require intervention or the discontinuation of danazol therapy. Conclusions: We conclude that neither erythrocytosis, nor polyglobulia occurs more often in C1-INH-HAE patients than in healthy individuals; it can be observed only sporadically even after treatment with danazol.

Original languageEnglish
Article number18
JournalOrphanet journal of rare diseases
Issue number1
Publication statusPublished - Feb 25 2016



  • C1-inhibitor deficiency
  • Erythrocytosis
  • Haematology
  • Hereditary angioedema
  • Polyglobulia
  • Prophylaxis
  • danazol

ASJC Scopus subject areas

  • Genetics(clinical)
  • Pharmacology (medical)

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