Therapeutic Efficacy of Anagrelide for Thrombocytosis.
- Author:
Jin Young KIM
1
;
Yoo Jin KIM
;
Byung Ha CHUNG
;
Chan Lan YOU
;
Ji Song KO
;
Yoon Hee PARK
;
Hee Je KIM
;
Seok LEE
;
Dong Wook KIM
;
Woo Sung MIN
;
Chun Choo KIM
Author Information
1. Department of Internal Medicine, The Catholic University of Korea College of Medicine, Seoul, Korea. yoojink@catholic.ac.kr
- Publication Type:Original Article
- Keywords:
Anagrelide;
Thrombocytosis;
Essential thrombocythemia;
Chronic myeloenous leukemia
- MeSH:
Headache;
Humans;
Hydroxyurea;
Interferons;
Leukemia, Myelogenous, Chronic, BCR-ABL Positive;
Leukocyte Count;
Megakaryocytes;
Myeloproliferative Disorders;
Platelet Count;
Retrospective Studies;
Thorax;
Thrombocythemia, Essential;
Thrombocytosis*;
Tinnitus
- From:Korean Journal of Hematology
2003;38(3):164-168
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
BACKGROUND: Thrombocytosis can result in life-threatening thrombotic or hemorrhagic events. Anagrelide acts exclusively on megakaryocytes and has been reported as an useful agent in controlling thromobocytosis associated with chronic myeloproliferative disorders. METHODS: Seven patients with essential thrombocythemia and three with chronic myelogenous leukemia were enrolled and early responses and adverse effects of anagrelide were retrospectively analyzed. The drug was started with a dose of 2 mg/day with increases of 0.5 mg/day every 5~7 days as needed. RESULTS: Anagrelide in starting doses of 2 mg/day reduced the platelet count by 50%, or to less than 600,000/mm3, for at least 28 days in 7 of the 9 (78%) evaluable patients. Adverse effects of the drug were observed in 5 patients and generally well tolerated; headache in 4, gastrointestinal troubles in 2, palpitations and chest tightness in 1, and tinnitus in 1. Changes in hemoglobin or white blood cell counts in peripheral blood were minimal and tolerable. CONCLUSION: The present study shows that anagrelide is a useful platelet-lowering agent in whom hydroxyurea or interferon has failed. Long-term efficacy and adverse effects of the drug remain to be determined.
