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    Addition of Navitoclax to Ongoing Ruxolitinib Therapy for Patients With Myelofibrosis With Progression or Suboptimal Response: Phase II Safety and Efficacy

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    Authors
    Harrison, C. N.
    Garcia, J. S.
    Somervaille, Tim C P
    Foran, J. M.
    Verstovsek, S.
    Jamieson, C.
    Mesa, R.
    Ritchie, E. K.
    Tantravahi, S. K.
    Vachhani, P.
    O'Connell, C. L.
    Komrokji, R. S.
    Harb, J.
    Hutti, J. E.
    Holes, L.
    Masud, A. A.
    Nuthalapati, S.
    Potluri, J.
    Pemmaraju, N.
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    Affiliation
    Guy's and St Thomas' NHS Foundation Trust, London, United Kingdom. Dana-Farber Cancer Institute, Boston, MA. The Christie NHS Foundation Trust, Manchester, United Kingdom. Cancer Research UK Manchester Institute, The University of Manchester, Manchester, United Kingdom. Mayo Clinic, Jacksonville, FL. The University of Texas MD Anderson Cancer Center, Houston, TX. University of California San Diego Moores Cancer Center, La Jolla, CA. University of Texas Health San Antonio, San Antonio, TX. Division of Hematology and Oncology, Weill Cornell Medical College, New York, NY. University of Utah and Huntsman Cancer Institute, Salt Lake City, UT. O'Neal Comprehensive Cancer Center at UAB, Birmingham, AL. University of Southern California Keck School of Medicine, Los Angeles, CA. Moffitt Cancer Center, Tampa, FL. AbbVie Inc., North Chicago, IL.
    Issue Date
    2022
    
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    Abstract
    PURPOSE Targeting the BCL-XL pathway has demonstrated the ability to overcome Janus kinase inhibitor resistance in preclinical models. This phase II trial investigated the efficacy and safety of adding BCL-XL/BCL-2 inhibitor navitoclax to ruxolitinib therapy in patients with myelofibrosis with progression or suboptimal response to ruxolitinib monotherapy (NCT03222609). METHODS Thirty-four adult patients with intermediate-/high-risk myelofibrosis who had progression or suboptimal response on stable ruxolitinib dose (≥ 10 mg twice daily) were administered navitoclax at 50 mg once daily starting dose, followed by escalation to a maximum of 300 mg once daily in once in weekly increments (if platelets were ≥ 75 × 109/L). The primary end point was ≥ 35% spleen volume reduction (SVR35) from baseline at week 24. Secondary end points included ≥ 50% reduction in total symptom score (TSS50) from baseline at week 24, hemoglobin improvement, change in bone marrow fibrosis (BMF) grade, and safety. RESULTS High molecular risk mutations were identified in 58% of patients, and 52% harbored ≥ 3 mutations. SVR35 was achieved by 26.5% of patients at week 24, and by 41%, at any time on study, with an estimated median duration of SVR35 of 13.8 months. TSS50 was achieved by 30% (6 of 20) of patients at week 24, and BMF improved by 1-2 grades in 33% (11 of 33) of evaluable patients. Anemia response was achieved by 64% (7 of 11), including one patient with baseline transfusion dependence. Median overall survival was not reached with a median follow-up of 21.6 months. The most common adverse event was reversible thrombocytopenia without clinically significant bleeding (88%). CONCLUSION The addition of navitoclax to ruxolitinib in patients with persistent or progressive myelofibrosis resulted in durable SVR35, improved TSS, hemoglobin response, and BMF. Further investigation is underway to qualify the potential for disease modification.
    Citation
    Harrison CN, Garcia JS, Somervaille TCP, Foran JM, Verstovsek S, Jamieson C, et al. Addition of Navitoclax to Ongoing Ruxolitinib Therapy for Patients With Myelofibrosis With Progression or Suboptimal Response: Phase II Safety and Efficacy [Internet]. Journal of Clinical Oncology. American Society of Clinical Oncology (ASCO); 2022.
    Journal
    J Clin Oncol
    URI
    http://hdl.handle.net/10541/625096
    DOI
    10.1200/jco.21.02188
    PubMed ID
    35180010
    Additional Links
    https://dx.doi.org/10.1200/jco.21.02188
    Type
    Article
    Language
    en
    ae974a485f413a2113503eed53cd6c53
    10.1200/jco.21.02188
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