Abstract:
UNLABELLED:Ruxolitinib, a JAK1/JAK2 inhibitor, is currently the only pharmacological agent approved for the treatment of myelofibrosis. Approval was based on findings from two phase 3 trials comparing ruxolitinib with placebo (COMFORT-I) and with best available therapy (COMFORT-II) for the treatment of primary or secondary myelofibrosis. In those pivotal trials, ruxolitinib rapidly improved splenomegaly, disease-related symptoms, and quality of life and prolonged survival compared with both placebo and conventional treatments. However, for reasons that are currently unclear, there were only modest histomorphological changes in the bone marrow, and only a subset of patients had significant reductions in JAK2 V617F clonal burden. Here we describe a patient with post-polycythemia vera myelofibrosis who received ruxolitinib at our institution (Guy's and St. Thomas' NHS Foundation Trust, London, United Kingdom) as part of the COMFORT-II study. While on treatment, the patient had dramatic improvements in splenomegaly and symptoms shortly after starting ruxolitinib. With longer treatment, the patient had marked reductions in JAK2 V617F allele burden, and fibrosis of the bone marrow resolved after approximately 3 years of ruxolitinib treatment. To our knowledge, this is the first detailed case report of resolution of fibrosis with a JAK1/JAK2 inhibitor. TRIAL REGISTRATION:ClinicalTrials.gov Identifier: NCT00934544.
journal_name
Haematologicajournal_title
Haematologicaauthors
Wilkins BS,Radia D,Woodley C,Farhi SE,Keohane C,Harrison CNdoi
10.3324/haematol.2013.095109subject
Has Abstractpub_date
2013-12-01 00:00:00pages
1872-6issue
12eissn
0390-6078issn
1592-8721pii
haematol.2013.095109journal_volume
98pub_type
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