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JOURNAL ARTICLE
REVIEW
Erdheim-Chester Disease: Comprehensive Review of Molecular Profiling and Therapeutic Advances.
Anticancer Research 2017 June
The revised 2016 World Health Organization classification introduced Erdheim-Chester disease (ECD) as a provisional entity within the histiocytic and dendritic cell neoplasms separate from the juvenile xanthogranuloma family based on distinct molecular features. However, evolving knowledge regarding the molecular and genetic aberrations in addition to common clinical features of ECD support the classification of ECD together with Langerhans cell histiocytosis (LCH). Accordingly, ECD can be thought of as an inflammatory myeloid clonal disorder based on the detection of various activating mutations along the mitogen activated protein kinase-extracellular signal regulated kinase (MAPK-ERK) pathway with most notable variant being a valine to a glutamic acid substitution at amino acid 600 in the B-rapidly accelerated fibrosarcoma protein (BRAFV600E). In this group, targeted therapy with a B-Raf inhibitor alone or combined with a MAPK-ERK (MEK) inhibitor has shown promising results based on several case reports. Currently, two phase II trials with BRAF inhibitors are underway and could potentially change the standard of care. MEK inhibitors may also be efficacious in ECD harboring mutations in MAP2K1; other potential targetable aberrations include programed cell death receptor 1 and mutations in phosphoinositide 3-kinase.
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