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A Safety Study of XL019 in Adults With Myelofibrosis

This study has been terminated.
(Due to emerging safety data)
Information provided by:
Exelixis Identifier:
First received: August 27, 2007
Last updated: April 4, 2011
Last verified: April 2011
The purpose of this study is to evaluate the safety and tolerability of XL019 in adults with myelofibrosis. XL019 is a selective inhibitor of the cytoplasmic tyrosine kinase JAK2. JAK2 is activated by cytokine and growth factor receptors and phosphorylates members of the STAT family of inducible transcription factors. Activation of the JAK/STAT pathway promotes cell growth and survival, and is a common feature of human tumors. JAK2 is activated by mutation in the majority of patients with myelofibrosis, polycythemia vera and essential thrombocytosis and appears to drive the inappropriate growth of blood cells in these conditions.

Condition Intervention Phase
Myeloproliferative Disorders
Polycythemia Vera
Thrombocythemia, Essential
Drug: XL019
Phase 1

Study Type: Interventional
Study Design: Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Treatment
Official Title: A Phase 1 Dose-Escalation Study of the Safety, Pharmacokinetics, and Pharmacodynamics of XL019 Administered to Subjects With Myelofibrosis

Resource links provided by NLM:

Further study details as provided by Exelixis:

Primary Outcome Measures:
  • To evaluate the safety, tolerability, maximum tolerated dose, and dose-limiting toxicities of XL019 as a single agent when orally administered in subjects with PMF, post-PV MF, or post-ET MF. [ Time Frame: Assessed at periodic visits ]

Secondary Outcome Measures:
  • Determine plasma pharmacokinetics, evaluate pharmacodynamic correlates, and estimate renal elimination of XL019 [ Time Frame: Assessed at periodic visits ]
  • Evaluate preliminary efficacy of XL019 as a single agent when administered orally [ Time Frame: Assessed at periodic visits ]

Estimated Enrollment: 100
Study Start Date: August 2007
Intervention Details:
    Drug: XL019
    gelatin capsules supplied in 5-mg, 25-mg, and 100-mg strengths

Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • The subject has primary myelofibrosis (PMF), post-polycythemia vera MF, or post-essential thrombocythemia MF and requires therapy, including subjects who have received prior MF-directed therapy and relapsed or subjects with refractory disease; or if newly diagnosed, then with intermediate or high risk according to the Lille scoring system.
  • The subject is unwilling to undergo or is not a candidate for peripheral stem cell/bone marrow transplant.
  • The subject is ≥18 years old.
  • The subject has an Eastern Cooperative Oncology Group (ECOG) performance status of ≤2.
  • The subject has adequate organ function.
  • The subject has the capability of understanding the informed consent document and has signed the informed consent document.
  • Sexually active subjects (male and female) must use medically acceptable methods of contraception during the course of the study.
  • Female subjects of childbearing potential must have a negative pregnancy test at screening.
  • The subject has had no diagnosis of malignancy or evidence of other malignancy for 2 years prior to screening for this study (except non-melanoma skin cancer or in situ carcinoma of the cervix).

Exclusion Criteria:

  • The subject has uncontrolled intercurrent illness including, but not limited to, ongoing or active infection, hypertension, symptomatic congestive heart failure, unstable angina pectoris, myocardial infarction within 3 months, or cardiac arrhythmias.
  • The subject is pregnant or breastfeeding.
  • The subject is known to be positive for the human immunodeficiency virus (HIV).
  • The subject is unable or unwilling to abide by the study protocol or cooperate fully with the investigator or designee.
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00522574

United States, California
UCSF - Division of Hematology/Oncology
San Francisco, California, United States, 94143
United States, Florida
H. Lee Moffitt Cancer Center & Research Institute
Tampa, Florida, United States, 33612
United States, Massachusetts
Dana Farber Cancer Institute
Boston, Massachusetts, United States, 02115
United States, New York
Mt. Sinai School of Medicine
New York, New York, United States, 10029
United States, Texas
MD Anderson Cancer Center
Houston, Texas, United States, 77030
Sponsors and Collaborators
  More Information

Responsible Party: Chunyan Song, MD/Senior Manager, Clinical Research, Exelixis Identifier: NCT00522574     History of Changes
Other Study ID Numbers: XL019-001
Study First Received: August 27, 2007
Last Updated: April 4, 2011

Keywords provided by Exelixis:
Myeloproliferative Disorders

Additional relevant MeSH terms:
Primary Myelofibrosis
Polycythemia Vera
Myeloproliferative Disorders
Thrombocythemia, Essential
Bone Marrow Diseases
Hematologic Diseases
Blood Platelet Disorders
Blood Coagulation Disorders
Hemorrhagic Disorders processed this record on March 27, 2017