Mutation in SPINK5 causes Netherton syndrome, a rare recessive skin disease that is accompanied by severe atopic manifestations including atopic dermatitis, allergic rhinitis, asthma, high serum IgE and hypereosinophilia.
The clinical laboratory work-up confirmed secondary HE in 25 (20%) patients; myeloid/lymphoid neoplasms with rearrangements of PDGFRA (n = 9) or PDGFRB (n = 2) (9%); HE associated with a well-defined myeloid neoplasm in 8 (6%); and abnormal bone marrow and/or molecular genetic abnormalities consistent with chronic eosinophilic leukemia (CEL), not otherwise specified (NOS) in 21 (17%) patients.
Testing for a FIP1L1-PDGFRA rearrangement is at present limited to patients with idiopathic hypereosinophilia, and we hypothesize that this abnormality may be under-diagnosed in children with acute leukemias.
Chronic eosinophilic leukaemia associated with the FIP1L1-PDGFRA fusion gene (F/P+ CEL) is a rare cause of marked persistent hypereosinophilia, arising almost exclusively in male patients.
We therefore investigated 426 samples from patients with hypereosinophilia of unknown significance initially referred for screening of the FIP1L1-PDGFRA (FP) fusion gene also for KIT D816V and JAK2 V617F mutations.
The hypereosinophilia and high immunoglobulin E levels might partly be explained by elevated IL-5 and -13 as a result of lack of negative feedback from defective STAT3 signaling.
Activated forms of the platelet derived growth factor receptor alpha (PDGFRα) have been described in various tumors, including FIP1L1-PDGFRα in patients with myeloproliferative diseases associated with hypereosinophilia and the PDGFRα(D842V) mutant in gastrointestinal stromal tumors and inflammatory fibroid polyps.
Activated forms of the platelet derived growth factor receptor alpha (PDGFRα) have been described in various tumors, including FIP1L1-PDGFRα in patients with myeloproliferative diseases associated with hypereosinophilia and the PDGFRα(D842V) mutant in gastrointestinal stromal tumors and inflammatory fibroid polyps.
The Fip1-like1 (FIP1L1)-platelet-derived growth factor receptor alpha fusion gene (F/P) arising in the pluripotent hematopoietic stem cell (HSC),causes 14% to 60% of patients with hypereosinophilia syndrome (HES).
The Fip1-like1 (FIP1L1)-platelet-derived growth factor receptor alpha fusion gene (F/P) arising in the pluripotent hematopoietic stem cell (HSC),causes 14% to 60% of patients with hypereosinophilia syndrome (HES).
ETV6-PDGFRB (also called TEL-PDGFRB) and FIP1L1-PDGFRA are receptor-tyrosine kinase fusion genes that cause chronic myeloid malignancies associated with hypereosinophilia.
ETV6-PDGFRB (also called TEL-PDGFRB) and FIP1L1-PDGFRA are receptor-tyrosine kinase fusion genes that cause chronic myeloid malignancies associated with hypereosinophilia.
FIP1L1/PDGFR alpha-positive disorders are characterized by clonal hypereosinophilia, multiple organ dysfunctions due to eosinophil infiltration, systemic mastocytosis (SM) and a dramatic response to treatment with imatinib mesylate.
Despite patients with FIP1-like-1-platelet-derived growth factor alpha (FIP1L1-PDGFRA) associated HES (myeloid neoplasms associated with PDGFRA rearrangement) have been shown to respond to low-dose imatinib with a complete and durable hematological and cytogenetic remission, influences of imatinib on clinical manifestations related to hypereosinophilia heart involvement are variable.
Despite patients with FIP1-like-1-platelet-derived growth factor alpha (FIP1L1-PDGFRA) associated HES (myeloid neoplasms associated with PDGFRA rearrangement) have been shown to respond to low-dose imatinib with a complete and durable hematological and cytogenetic remission, influences of imatinib on clinical manifestations related to hypereosinophilia heart involvement are variable.
The year 2008 marks the fifth anniversary since the publication which identified the FIP1L1-PDGFRA fusion gene in patients with idiopathic hypereosinophilia.
Furthermore, the same FIP1L1-PDGFRA rearrangement was identified in patients with hypereosinophilia and atypical mast cell proliferations, raising the question of a disease with two concomitant lines of differentiation.
The year 2008 marks the fifth anniversary since the publication which identified the FIP1L1-PDGFRA fusion gene in patients with idiopathic hypereosinophilia.
The identification of populations of aberrant T-lymphocytes secreting eosinophilopoietic cytokines such as interleukin-5 establish a pathophysiologic basis for cases of lymphocyte-mediated hypereosinophilia.
Overexpression was detected in 12/12 FIP1L1-PDGFRA-positive patients, plus 9/217 (4%) patients with hypereosinophilia who had tested negative forFIP1L1-PDGFRA.