Study of the Glutaminase Inhibitor CB-839 in Hematological Tumors


  • Study type

  • Study phase

  • Study IDs

  • Describes the nature of a clinical study. Types include:

    • Observational study — observes people and measures outcomes without affecting results.
    • Interventional study (clinical trial) — studies new tests, treatments, drugs, surgical procedures or devices.
    • Medical records research — uses historical information collected from medical records of large groups of people to study how diseases progress and which treatments and surgeries work best.
  • During the early phases (phases 1 and 2), researchers assess safety, side effects, optimal dosages and risks/benefits. In the later phase (phase 3), researchers study whether the treatment works better than the current standard therapy. They also compare the safety of the new treatment with that of current treatments. Phase 3 trials include large numbers of people to make sure that the result is valid. There are also less common very early (phase 0) and later (phase 4) phases. Phase 0 trials are small trials that help researchers decide if a new agent should be tested in a phase 1 trial. Phase 4 trials look at long-term safety and effectiveness, after a new treatment has been approved and is on the market.

  • Site IRB
    • Scottsdale/Phoenix, Arizona: 14-000452
    NCT ID: NCT02071888
    Sponsor Protocol Number: CX-839-002

About this study

Many tumor cells, in contrast to normal cells, have been shown to require the amino acid glutamine to produce energy for growth and survival. To exploit the dependence of tumors on glutamine, CB-839, a potent and selective inhibitor of the first enzyme in glutamine utilization, glutaminase, will be tested in this Phase 1 study in patients with advanced hematologic malignancies.

This study is an open-label Phase 1 evaluation of CB-839 in subjects with hematological tumors. Patients will receive CB-839 capsules orally three times daily. The study will be conducted in 2 parts. Part 1 is a dose escalation study to identify the recommended Phase 2 dose. In Part 2, all patients will receive the recommended Phase 2 dose. Both Parts 1 and 2 will enroll patients with advanced and/or treatment-refractory Non-Hodgkin's Lymphoma (NHL), Multiple Myeloma (MM), or Waldenström's macroglobulinemia (WM). All patients will be assessed for safety, pharmacokinetics (plasma concentration of drug), pharmacodynamics (inhibition of glutaminase), biomarkers (biochemical markers that may predict responsiveness in later studies), and tumor response.

Participation eligibility

Participant eligibility includes age, gender, type and stage of disease, and previous treatments or health concerns. Guidelines differ from study to study, and identify who can or cannot participate. If you need assistance understanding the eligibility criteria, please contact the study team.

See eligibility criteria

Disease-Specific Inclusion Criteria

Patients must have one of the following diseases that is either relapsed or refractory to 2 or more prior treatments:

  • NHL: At least one measurable lesion
  • WM: Measurable IgM, with a minimum level of ≥ 2x ULN
  • MM: Serum M-protein ≥ 0.5 g/dL and/or urine M-protein ≥ 200 mg/24 hr. In Part 2, disease that is considered measurable per the IMWG criteria

Other Inclusion Criteria

  • Eastern Cooperative Oncology Group (ECOG) Performance Status of 0-1
  • Life Expectancy of at least 3 months
  • Adequate hepatic, renal, cardiac and hematological function

Exclusion Criteria

  • Any other current malignancy
  • Treatment with an unapproved, investigational therapeutic agent, immunotherapy or biological therapy within 21 days prior to the first dose of study drug
  • Recent bone marrow transplant
  • Unable to receive medications by mouth
  • Major surgery within 28 days before the first dose of study drug
  • Uncontrolled, active infection; patients who are known to have HIV infection/ seropositivity, Hepatitis A, B, or C, or CMV reactivation
  • Significant neurotoxicity/neuropathy (Grade 3 or higher) within 14 days prior to the first dose of study drug
  • Refractory nausea and vomiting or other situation that may preclude adequate absorption
  • Other conditions that could interfere with treatment

Participating Mayo Clinic locations

Study statuses change often. Please contact us for help.

Mayo Clinic Location Status Contact

Scottsdale/Phoenix, Ariz.

Mayo Clinic principal investigator

Keith Stewart, M.B., Ch.B.

Closed for enrollment

Contact information:

Research Information Center



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