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A single weekly dose of imatinib is sufficient to induce and maintain remission of chronic eosinophilic leukaemia in FIP1L1‐PDGFRA‐ expressing patients
Author(s) -
Helbig Grzegorz,
StellaHołowiecka Beata,
Majewski Mirosław,
Całbecka Małgorzata,
Gajkowska Jolanta,
Klimkiewicz Ryszard,
Moskwa Andrzej,
Grzegorczyk Janina,
Lewandowska Monika,
Hołowiecki Jerzy
Publication year - 2008
Publication title -
british journal of haematology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.907
H-Index - 186
eISSN - 1365-2141
pISSN - 0007-1048
DOI - 10.1111/j.1365-2141.2008.07033.x
Subject(s) - imatinib , medicine , hypereosinophilic syndrome , imatinib mesylate , pdgfra , gastroenterology , hypereosinophilia , eosinophilia , gist , stromal cell , myeloid leukemia
Summary Hypereosinophilic syndrome (HES) is defined as chronic, unexplained hypereosinophilia with organ involvement. A subset of HES patients presents an interstitial deletion in chromosome 4q12, which leads to the expression of an imatinib‐responsive fusion gene, FIP1L1‐PDGFRA. These patients are diagnosed as chronic eosinophilic leukaemia (CEL). We treated seven CEL and HES patients, six of which expressed FIP1L1‐PDGFRA , with imatinib using initial daily doses ranging from 100 to 400 mg. In a remission maintenance phase, the patients were treated with imatinib once weekly. All imatinib‐treated patients achieved a complete haematological remission (CHR), and five of the six patients with FIP1L1‐PDGFRA expression exhibited molecular remission. The decreased imatinib doses were as follows: 200 mg/week in three patients, 100 mg/week in two patients and 100 mg/d in the remaining two patients. For remission maintenance, imatinib doses were set at 100 mg/week in five patients and 200 mg/week in two patients. At a median follow‐up of 30 months all patients remained in CHR and FIP1L1‐PDGFRA expression was undetectable in five of the six FIP1L1‐PDGFRA ‐expressing patients. These data suggest that a single weekly dose of imatinib is sufficient to maintain remission in FIP1L1‐PDGFRA ‐ positive CEL patients.