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Encorafenib Plus Binimetinib for People With BRAF V600E Mutated Relapsed/Refractory HCL

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Know the risks and potential benefits of clinical studies and talk to your health care provider before participating. Read our disclaimer for details. Identifier: NCT04324112
Recruitment Status : Recruiting
First Posted : March 27, 2020
Last Update Posted : January 7, 2021
Information provided by (Responsible Party):
National Institutes of Health Clinical Center (CC) ( National Cancer Institute (NCI) )

Tracking Information
First Submitted Date  ICMJE March 26, 2020
First Posted Date  ICMJE March 27, 2020
Last Update Posted Date January 7, 2021
Actual Study Start Date  ICMJE October 28, 2020
Estimated Primary Completion Date April 30, 2024   (Final data collection date for primary outcome measure)
Current Primary Outcome Measures  ICMJE
 (submitted: March 26, 2020)
CR rate [ Time Frame: every year ]
determine if treatment with combination encorafenib and binimetinib in BRAF V600E+HCL is associated with a CR rate which exceeds that of vemurafenib
Original Primary Outcome Measures  ICMJE Same as current
Change History
Current Secondary Outcome Measures  ICMJE
 (submitted: March 26, 2020)
  • MRD negative CR [ Time Frame: every year ]
    Fraction of patients who achieve MRD negative CR after treatment with encorafenib and binimetinib
  • time to next treatment [ Time Frame: every year ]
    duration of time from the start of the study drugs to next line of treatment
  • overall survival [ Time Frame: every year ]
    the time from the start of the treatment until time of death from any cause
  • event free survival [ Time Frame: every year ]
    the time from study enrollment to the first occurrence of progression, relapse after response, or death from any cause
  • duration of response [ Time Frame: every year ]
    the time criteria are met for CR or PR (whichever is recorded first) until the first date that patient no longer qualifies as a PR
  • progression free-survival [ Time Frame: every year ]
    duration of time from the start of the treatment until time of disease relapse from PR, disease progression, or death, whichever occurs first
  • rate of pyrexia [ Time Frame: every year ]
    fraction of patients that have pyrexia at any time while on study
Original Secondary Outcome Measures  ICMJE Same as current
Current Other Pre-specified Outcome Measures Not Provided
Original Other Pre-specified Outcome Measures Not Provided
Descriptive Information
Brief Title  ICMJE Encorafenib Plus Binimetinib for People With BRAF V600E Mutated Relapsed/Refractory HCL
Official Title  ICMJE Phase 2 Trial of Encorafenib Plus Binimetinib for Patients With BRAF V600E Mutated Relapsed/Refractory HCL
Brief Summary


Hairy cell leukemia (HCL) does not usually respond to chemotherapy. Most people with HCL have a BRAF gene mutation. This can increase the growth of cancer cells. Vemurafenib has been tested to treat these people. However, researchers think a combination of drugs might work better.


To test if treatment with a combination of encorafenib and binimetinib in BRAF mutant

HCL is more effective than treatment with vemurafenib.


People ages 18 and older with BRAF mutant HCL that did not respond to or came back after treatment


Participants will be screened with:

Medical history

Physical exam

Bone marrow biopsy: A needle will be injected through the participant s skin and into a bone to remove liquid.

Blood and urine tests

Heart and lung function tests

CT or MRI scan: Participants will lie in a machine that takes pictures of the body. They may have a contrast agent injected into a vein.

Eye exam

Participants will take the study drugs by mouth in 28-day cycles. They will take encorafenib daily. They will take binimetinib twice daily. They will keep a pill diary.

Participants will take their temperature daily.

Participants will have at least 1 visit before each cycle. Visits will include repeats of some screening tests. They will also include abdominal ultrasounds, exercise stress tests, and skin evaluations.

Participants may continue treatment as long as their disease does not get worse and they do not have bad side effects.

About a month after their last dose of treatment, participants will have a follow-up visit. Then they will have annual follow-ups....

Detailed Description


  • Hairy cell leukemia (HCL) is an indolent B-cell leukemia comprising 2% of all leukemias, or approximately 1900 new cases/year in the US. The nucleoside analogs cladribine and pentostatin are highly active as monotherapy with complete remission (CR) rates of 80 to 90%. However, there is no cure from chemotherapy and patients eventually relapse with worse efficacy and cumulative toxicity (stem cell damage and neuropathy) with each repeated chemotherapy course.
  • About 90% of classic HCL patients have the BRAF V600E mutation, which leads to Rasindependent activation of the MAPK pathway, causing increased phosphorylation (hyperactivation) of MEK, followed by ERK, therefore promoting the proliferation and survival of

HCL cells.

  • The BRAF inhibitor, vemurafenib, when used as a single agent for the treatment of HCL achieved high response rate with CR rate of 38% in 50 patients reported from 2 trials, however, treatment was limited to several months and responses lacked durability, with median CR duration of 19 months in 1 trial. In this trial, 100% of the CRs were positive for minimal residual disease (MRD) by immunohistochemistry (IHC), and failure to eradicate MRD after several months of vemurafenib likely lead to the lack of CR durability.
  • In a recent trial of combined inhibition of BRAF and MEK using dabrafenib and trametinib treatment, 49% of 41 evaluable patients achieved CR, and MRD was eradicated in 15% of patients on this trial. At NIH, we enrolled a total of 28 HCL patients on this trial and achieved a CR rate of 68% amongst our patients by managing toxicity and allowing patients to remain on treatment.
  • A major challenge in the long-term treatment of HCL patients with dabrafenib and trametinib is managing fever, which has necessitated long-term or intermittent steroids use for most patients.
  • In the COLOMBUS trial, the combination of the BRAF inhibitor, encorafenib and the MEK inhibitor, binimetinib was found to be superior to vemurafenib for BRAF V600E+ melanoma with respect to PFS and OS and was well tolerated with low rates of toxicities including pyrexia.
  • To our knowledge, neither encorafenib nor binimetinib has been tested in HCL, but the low rate of pyrexia with encorafenib plus binimetinib in melanoma suggests that this combination may be well tolerated in HCL.


-To determine if treatment with combination encorafenib and binimetinib in BRAF V600E+HCL is associated with a CR rate which exceeds that of vemurafenib.


  • BRAF V600E mutant HCL with at least 1 prior purine analog treatment
  • Need for treatment, as evidenced by any one of the following: ANC <1 x10(3)/mcL, Hgb <10g/dL, Platelet count <100 x10(3)/mcL, leukemia cell count >5 x10(3)/mcL, symptomatic splenomegaly, enlarging HCL mass > 2cm in short axis
  • Greater than or equal to 18 years of age
  • No uncontrolled infection, cardiopulmonary dysfunction, or secondary malignancy requiring treatment.
  • No chemotherapy, immunotherapy, investigational agent or radiotherapy within 4 weeks prior to the start of study treatment.


  • Phase 2 trial, single arm, non-randomized trial to determine if the combination of encorafenib and binimetinib achieves a CR rate in HCL which is historically higher than that of vemurafenib.
  • Simon optimal 2-phase design will be used to rule out an unacceptable CR rate of 35% in favor of an improved 55% CR rate.
  • Initially 12 evaluable patients will be enrolled. If 5 or more achieve CR, then accrual will continue to a total of 32 evaluable patients
  • Encorafenib will be given at a dose of 450mg QD and binimetinib at a dose of 45mg BID for as long as patients can continue dosing chronically without significant toxicity
Study Type  ICMJE Interventional
Study Phase  ICMJE Phase 2
Study Design  ICMJE Allocation: N/A
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Condition  ICMJE Hairy Cell Leukemia
Intervention  ICMJE
  • Drug: binimetinib
    Binimetinib will be given orally at a dose of 45mg BID continuously for 28- day cycles with no resting period between cycles.
  • Drug: Encorafenib
    Encorafenib will be given orally at a dose of 450mg QD continuously for 28-day cycles with no resting period between cycles.
Study Arms  ICMJE Experimental: Arm 1/Experimental therapy
Treatment with encorafenib and binimetinib
  • Drug: binimetinib
  • Drug: Encorafenib
Publications * Not Provided

*   Includes publications given by the data provider as well as publications identified by Identifier (NCT Number) in Medline.
Recruitment Information
Recruitment Status  ICMJE Recruiting
Estimated Enrollment  ICMJE
 (submitted: March 26, 2020)
Original Estimated Enrollment  ICMJE Same as current
Estimated Study Completion Date  ICMJE July 31, 2024
Estimated Primary Completion Date April 30, 2024   (Final data collection date for primary outcome measure)
Eligibility Criteria  ICMJE

    1. Histologically confirmed diagnosis of HCL according to morphological and immunophenotypic criteria of WHO classification [WHO, 2008 revised 2016] of lymphoid neo

      • Absolute neutrophil count (ANC) <1 x10(3)/mcL
      • Hemoglobin <10g/dL
      • Platelets<100 x10(3)/mcL
      • Symptomatic splenomegaly
      • Enlarging HCL mass > 2cm in short axis
      • Leukemia cell count>5x10(3)/mcL

      Patients who have eligible blood counts within 4 weeks prior to initiation of study therapy will not be considered ineligible if subsequent blood counts prior to initiation of study therapy fluctuate and become ineligible up until the time of the initiation of study therapy.

    2. Patients must have BRAF V600E mutation as confirmed from fresh bone marrow aspirate, peripheral blood sample, or lymph node/mass by the Laboratory of Pathology, NCI
    3. Patients who are ineligible for, unable to obtain in a timely manner, cannot access, unwilling to undergo or have failed Moxetumomab Pasudotox trial at NCI
    4. Refractory or relapsed disease- defined as either:

      • Refractory- no response or disease progression in <=1 year following first-line treatment with a purine analog, or
      • Relapsed- having relapsed following treatment with at least 1 prior purine-analog treatment
    5. Age >=18 years
    6. ECOG performance status <=2 (Karnofsky >60%)
    7. Patients must have adequate organ and marrow function as defined below:

      • Total bilirubin <= 3x upper limit of normal (ULN), unless consistent with Gilbert s (ratio between total and direct bilirubin > 5)
      • AST and ALT <= 3x ULN
      • Alkaline phosphatase < 2.5x ULN
      • Serum creatinine <= 1.5 mg/dL or creatinine clearance >= 60 mL/min/1.73 m^2 for patients with creatinine levels above institutional normal calculated using eGFR
      • Serum albumin >= 2 g/dL
      • Prothrombin time (PT)/International Normalized Ratio < 2.5x ULN (If on warfarin, PT/INR < 3.5x ULN; If on any other anticoagulation, Prothrombin time (PT) < 2.5x ULN
      • Fibrinogen >= 0.5x lower limit of normal
    8. The effects of the study drugs on the developing human fetus are unknown therefore participants must use effective methods of contraception as directed below.

      --Females of childbearing potential (FOCBP) who are sexually active with a nonsterilized male partner must use a highly effective method of contraception and not donate ova prior to study entry and or the duration of study treatment and until 30 days after the last dose of study drug. Periodic abstinence, the rhythm method, and the withdrawal method are not acceptable methods of contraception. There is a potential for encorafenib to induce CYP3A4, which may reduce the effectiveness of hormonal contraception methods. Therefore, the use of at least 1 form of nonhormonal contraception is required for females of childbearing potential during study

      treatment in this study. Females of childbearing potential are defined as those who are not surgically sterile (i.e., bilateral tubal ligation, bilateral oophorectomy, or complete hysterectomy) or those who are premenarchal or postmenopausal (defined as 12 months with no menses without an alternative medical cause). A highly effective method of contraception is defined as one that results in a low failure rate (i.e., less than 1% per year) when used consistently and correctly. Not all methods of contraception are highly effective. Should a woman become pregnant or suspect she is pregnant while she or her partner is participating in this study, she should inform her treating physician immediately.

      • Male participants must use a condom during treatment and through 90 days after the end of systemic exposure to study drug/treatment. If the male participant has a partner that is of child-bearing potential, the partner should also use contraception through

        90 days after the end of systemic exposure to study drug/treatment. In addition, male participants must refrain from donating sperm during the study treatment and through 90 days after the end of systemic exposure to study drug/treatment. Males who have had a vasectomy qualify as having met the requirement for a highly effective birth control method.

    9. Ability of subject to understand and the willingness to sign a written informed consent document.
    10. Must co-enroll in study 10-C-0066: Collection of Human Samples to Study Hairy Cell and other Leukemias, and to Develop Recombinant Immunotoxins for Cancer Treatment


  1. Patients who have had chemotherapy, immunotherapy, investigational agent or radiotherapy within 4 weeks prior to the start of study treatment.
  2. Prior therapy with encorafenib and/or binimetinib
  3. Patients who are receiving any other investigational agents or have received an investigational agent within 14 days prior to the start of study treatment.
  4. Patients who have undergone major surgery less than or equal to 6 weeks prior to start of study treatment or who have not recovered from side effects of such procedure
  5. Known hypersensitivity or contraindication to any component of binimetinib or encorafenib or their excipients
  6. Inability to swallow and retain study drugs.
  7. Is pregnant or breastfeeding or expecting to conceive within the projected duration of the study treatment, starting with the screening visit. Pregnant women are excluded from this study because binimetinib and encorafenib have the potential for teratogenic

    or abortifacient effects. Because there is an unknown but potential risk for adverse events in nursing infants secondary to treatment of the mother with encorafenib and binimetinib, breastfeeding should be discontinued if the mother is treated.

  8. Uncontrolled intercurrent illness including, but not limited to, ongoing or active infection, cardiac dysfunction, uncontrolled pulmonary infection, pulmonary edema or psychiatric illness/social situations that would limit compliance with study requirements.
  9. Evidence of active Hepatitis B Virus (HBV) or Hepatitis C Virus (HCV) infection. Note: Patients with laboratory evidence of cleared HBV or HCV infection may be enrolled. If positive for Hepatitis B core antibody or surface antigen the patient must be on Tenofovir or Entecavir and Hepatitis B Viral deoxyribonucleic acid (DNA) load must be <2000 IU/mL
  10. Active second malignancy requiring treatment other than minor resection of indolent cancers like basal cell and squamous skin cancers.
  11. Human immunodeficiency virus (HIV)-positive patients unless taking appropriate anti-HIV medications with a CD4 count of > 200. Otherwise, there may be an increased risk of infections.
  12. History of an allogeneic bone marrow or stem cell transplant.
  13. Known history of acute or chronic pancreatitis.
  14. Impaired cardiovascular function or clinically significant cardiovascular disease including, but not limited to, any of the following:

    1. History of acute coronary syndromes (including myocardial infarction, unstable angina, coronary artery bypass grafting, coronary angioplasty or stenting) <3months prior to initiation of study therapy
    2. Congestive heart failure requiring treatment (New York Heart Association Grade greater than or equal to 2);
    3. Left ventricular ejection fraction (LVEF) < 50% as determined by Multigated Acquisition Scan (MUGA) or Transthoracic echocardiogram (TTE);
    4. Uncontrolled hypertension defined as persistent systolic blood pressure greater than or equal to 160 mmHg or diastolic blood pressure greater than or equal to 100 mmHg despite current therapy;
    5. History or presence of clinically significant cardiac arrhythmias (including resting bradycardia, uncontrolled atrial fibrillation or uncontrolled paroxysmal supraventricular tachycardia);
    6. Triplicate average baseline QTcF interval greater than or equal to 480 ms.
  15. Impairment of gastrointestinal function or disease which may significantly alter the absorption of study drug (e.g., active ulcerative disease, uncontrolled vomiting or diarrhea, malabsorption syndrome, small bowel resection with decreased intestinal

    absorption), or recent (less than or equal to 3 months) history of a partial or complete bowel obstruction, or other conditions that will interfere significantly with the absorption of oral drugs.

  16. Concurrent neuromuscular disorder that is associated with elevated CK (e.g., inflammatory myopathies, muscular dystrophy, amyotrophic lateral sclerosis, spinal muscular atrophy).
  17. History or current evidence of RVO or current risk factors for RVO (e.g., uncontrolled glaucoma or ocular hypertension, history of hyperviscosity or hypercoagulability syndromes); history of retinal degenerative disease.
  18. History of thromboembolic or cerebrovascular events less than or equal to 12 weeks prior to the first dose of study treatment. Examples include transient ischemic attacks, cerebrovascular accidents, hemodynamically significant (i.e. massive or sub-massive) deep vein thrombosis or pulmonary emboli. Note: Patients with either deep vein thrombosis or pulmonary emboli that does not result in hemodynamic instability are allowed to enroll as long as they are on a stable dose of anticoagulants for at least 4 weeks.
  19. Note: Patients with thromboembolic events related to indwelling catheters or other procedures may be enrolled
  20. Patients taking strong CYP3A4 inhibitors and strong/moderate CYP3A4 inducers
Sex/Gender  ICMJE
Sexes Eligible for Study: All
Ages  ICMJE 18 Years and older   (Adult, Older Adult)
Accepts Healthy Volunteers  ICMJE No
Contacts  ICMJE
Contact: Monica E Epstein, R.N. (301) 435-2375
Listed Location Countries  ICMJE United States
Removed Location Countries  
Administrative Information
NCT Number  ICMJE NCT04324112
Other Study ID Numbers  ICMJE 200076
Has Data Monitoring Committee Not Provided
U.S. FDA-regulated Product
Studies a U.S. FDA-regulated Drug Product: Yes
Studies a U.S. FDA-regulated Device Product: No
IPD Sharing Statement  ICMJE Not Provided
Responsible Party National Institutes of Health Clinical Center (CC) ( National Cancer Institute (NCI) )
Study Sponsor  ICMJE National Cancer Institute (NCI)
Collaborators  ICMJE Not Provided
Investigators  ICMJE
Principal Investigator: Robert J Kreitman, M.D. National Cancer Institute (NCI)
PRS Account National Institutes of Health Clinical Center (CC)
Verification Date December 29, 2020

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP