A Phase 2/3 interventional study of Dabrafenib and Trametinib in Haematological Malignancy, Malignant Neoplasm and Lymphoproliferative Disorders, sponsored by Cancer Research UK. Recruiting at 27 sites in United Kingdom. Open to participants aged 1 Year and older. Per ClinicalTrials.gov, last updated 2026-08-17.
Sponsored by Cancer Research UK · Phase 2/3, Interventional, and Treatment
This clinical trial is looking at two drugs called dabrafenib and trametinib. Dabrafenib and trametinib are approved as standard of care treatment for adult patients with melanoma (a type of skin cancer) or lung cancer and in children with glioma (a type of brain tumour). This means they have gone through clinical trials and been approved by the Medicines and Healthcare products Regulatory Agency (MHRA) in the UK. Dabrafenib and trametinib work in patients with a particular mutation in their cancer known as BRAF V600.
Investigators now wish to find out if they will be useful in treating patients with other cancer types which have the same mutation. If the results are positive, the study team will work with the NHS and the Cancer Drugs Fund to see if these drugs can be routinely accessed for patients in the future.
This trial is part of a trial programme called DETERMINE. The programme will also look at other anti-cancer drugs in the same way, through matching the drug to rare cancer types or ones with specific mutations.
DETERMINE Treatment Arm 07 (dabrafenib and trametinib) aims to evaluate the efficacy of dabrafenib and trametinib adult, paediatric and TYA patients with rare* cancers with BRAF V600 mutations or with common cancers where BRAF V600 mutations are considered to be infrequent.
*Rare is defined generally as incidence less than 6 cases in 100,000 patients (includes paediatric and teenagers/young adult cancers) or common cancers with rare alterations.
This treatment arm has a target sample size of 30 evaluable patients. Sub-cohorts may be defined and further expanded to a target of 30 evaluable patients each.
The ultimate aim is to translate positive clinical findings to the NHS (Cancer Drugs Fund) to provide new treatment options for rare adult, paediatric and TYA cancers.
OUTLINE:
Pre-screening: The Molecular Tumour Board makes a treatment recommendation for the patient based on molecularly-defined cohorts (See information on Master Screening Protocol below).
Screening: Consenting patients undergo biopsy and collection of blood samples for research purposes.
Treatment: Patients will receive dabrafenib and trametinib until disease progression without clinical benefit, unacceptable adverse events (AEs) or withdrawal of consent. Patients will also undergo collection of blood samples at various intervals while receiving treatment and at End of Treatment (EoT).
After completion of study treatment, patients are followed up every 3 months for 2 years.
THE DETERMINE TRIAL MASTER (SCREENING) PROTOCOL: Please see DETERMINE Trial Master (Screening) Protocol record (NCT05722886) for information on the DETERMINE Trial Master Protocol and applicable documents.
1,444 studies on the registry are indexed under Hematologic Neoplasms; 420 are open to participants now.
This study's planned enrollment of 30 is below the median of 46 across 1,044 interventional studies indexed under Hematologic Neoplasms.
Browse Hematologic Neoplasms studies →Cancer Research UK is the lead sponsor of 83 studies on the registry; 12 are open to participants now.
Counted across the registry records on this site, refreshed daily.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
THE PATIENT MUST FULFIL THE ELIGIBILITY CRITERIA WITHIN THE DETERMINE MASTER PROTOCOL (NCT05722886) AND WITHIN THE TREATMENT ARM 07 (DABRAFENIB AND TRAMETINIB) OUTLINED BELOW* *When dabrafenib- and trametinib-specific inclusion/exclusion criteria or precautions below differ from those specified in the Master Protocol, the dabrafenib- and trametinib-specific criteria will take precedence.
Inclusion criteria:
A. Confirmed diagnosis of a harbouring an oncogenic alteration in BRAF V600, including Langerhans cell histiocytosis, using an analytically validated next-generation sequencing method.
B. Patients ≥1 year old and ≥8 kg in body weight.
C. Women of are eligible provided that they meet the following criteria:
Patients who are breastfeeding must be willing to discontinue breastfeeding from the start of treatment, throughout the trial and for two weeks following discontinuation of dabrafenib and for 16 weeks following discontinuation of trametinib (whichever is later).
D. Male patients with partners who are women of childbearing potential are eligible provided that they agree to the following, from the first administration of dabrafenib and trametinib (whichever is first), throughout the trial and for two weeks after the last administration of dabrafenib and 16 weeks after the last administration of trametinib (whichever is later):
Non-vasectomised male partners with partners who are women of childbearing potential should also be advised of the benefit for their partner of using a highly effective method of contraception, such as:
i. combined (oestrogen and progestogen containing) hormonal contraception associated with inhibition of ovulation [oral, intravaginal or transdermal]), ii. progestogen-only hormonal contraception associated with inhibition of ovulation (oral, injectable or implantable), iii. IUD, iv. intrauterine hormone-releasing system (IUS), v. bilateral tubal occlusion, vi. total sexual abstinence.
E. Patients must be able and willing to undergo a fresh tissue at baseline and blood samples for translational research. Note that for patients with haematological malignancies or neuroblastomas, blood, bone marrow aspiration and/or trephine or lymph node biopsy samples may be taken.
F. Adequate organ function as per haematological and biochemical indices within the ranges defined in the protocol. These measurements should be performed to confirm the patient's eligibility
Exclusion criteria:
A. Diagnosis of one of the following BRAF V600E mutation-positive cancers:
B. Previous treatment with dabrafenib and trametinib in combination (or other BRAF and MEK inhibitors in combination) for the current indication.
C. Female patients who are pregnant, breastfeeding or planning to become pregnant during the trial or for two weeks following their last dose of dabrafenib or 16 weeks following their last dose of trametinib, whichever is later.
D. Known to dabrafenib or trametinib or any of the . See the current relevant SmPCs (UK) for the full lists.
E. Patients with a history of retinal vein occlusion.
F. Any impairment of gastrointestinal (GI) function of uncontrolled GI disease that may significantly alter the administration or absorption of dabrafenib and/or trametinib (e.g. history of diverticulitis, metastases to the GI tract, uncontrolled Crohn's disease, uncontrolled ulcerative diseases, uncontrolled nausea, vomiting, diarrhoea, malabsorption syndrome or short gut syndrome).
G. cardiac or cerebrovascular disease as defined by:
Patients with a cerebrovascular event (including stroke or [TIA]) within three months prior to screening.
H. Patients who were administered a live, attenuated vaccine within 28 days prior to initiation of treatment, or anticipation of need for such a vaccine during medicinal product (IMP) treatment or within six months after the final dose of dabrafenib and trametinib.
I. Known active infections (bacterial, fungal or viral) that would interfere with the assessment of safety or efficacy of dabrafenib and trametinib including (HIV) positivity. Patients with history of testing positive for HIV infection are eligible provided that each of the following conditions are met:
J. Any clinically significant concomitant disease or condition (or its treatment) that could interfere with the conduct of the trial (including absorption of oral medications) that would, in the opinion of the Investigator, pose an unacceptable risk to the patient in this trial.
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.
Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
A biopsy takes a small piece of tissue to examine. “Archival tissue” is a sample already taken, for example at diagnosis, and kept by the hospital.
Whether a stored sample will do depends on when it was taken, how much there is and what the study needs. Ask whether the study accepts your stored sample or needs a new biopsy.
Cancer that has spread from where it began to other parts of the body. “Metastatic” cancer is cancer that has spread this way.
An allergy, or another reaction of the immune system, to a substance. “Hypersensitivity to the study drug” means a known allergic reaction to it — not every side effect a medicine can have.
The other ingredients in a medicine besides the active drug, such as fillers, colours or preservatives.
Judged by the study doctor to matter for your health or for the study. It is a doctor’s decision, so ask the study team if you are unsure whether something counts.
The New York Heart Association’s four classes of how much heart failure limits physical activity.
Studies set their own limit — many outside heart failure leave out class III–IV, while heart failure studies may ask for a particular class. Check the class this study names.
A “mini-stroke”: temporary stroke-like symptoms caused by reduced blood flow to part of the brain, spinal cord or eye, without signs of a new stroke on a scan.
Stroke symptoms need emergency care at once, even if they go away.
A drug or device being studied in a clinical trial.
It may be new, or already approved and being studied for another use, dose or form. Criteria often leave out people who took part in another study of one within a recent period, commonly 30 days or five half-lives.
The human immunodeficiency virus, which weakens the immune system.
Many studies now accept people whose HIV is controlled on treatment, judged by the viral load and the CD4 count. Check the limits this study sets.
The number of CD4 cells, a type of white blood cell, in a given amount of blood. It is used to follow how well the immune system is doing in HIV.
Cancer (malignancy)
Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.
Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Childbearing potential
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Contraception
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Biopsy and archival tissue
A biopsy takes a small piece of tissue to examine. “Archival tissue” is a sample already taken, for example at diagnosis, and kept by the hospital.
Whether a stored sample will do depends on when it was taken, how much there is and what the study needs. Ask whether the study accepts your stored sample or needs a new biopsy.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Metastases
Cancer that has spread from where it began to other parts of the body. “Metastatic” cancer is cancer that has spread this way.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Hypersensitivity
An allergy, or another reaction of the immune system, to a substance. “Hypersensitivity to the study drug” means a known allergic reaction to it — not every side effect a medicine can have.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Excipients
The other ingredients in a medicine besides the active drug, such as fillers, colours or preservatives.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Clinically significant
Judged by the study doctor to matter for your health or for the study. It is a doctor’s decision, so ask the study team if you are unsure whether something counts.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
NYHA class (heart failure)
The New York Heart Association’s four classes of how much heart failure limits physical activity.
Studies set their own limit — many outside heart failure leave out class III–IV, while heart failure studies may ask for a particular class. Check the class this study names.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
TIA (transient ischaemic attack)
A “mini-stroke”: temporary stroke-like symptoms caused by reduced blood flow to part of the brain, spinal cord or eye, without signs of a new stroke on a scan.
Stroke symptoms need emergency care at once, even if they go away.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Investigational drug or device
A drug or device being studied in a clinical trial.
It may be new, or already approved and being studied for another use, dose or form. Criteria often leave out people who took part in another study of one within a recent period, commonly 30 days or five half-lives.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
HIV
The human immunodeficiency virus, which weakens the immune system.
Many studies now accept people whose HIV is controlled on treatment, judged by the viral load and the CD4 count. Check the limits this study sets.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
CD4 count
The number of CD4 cells, a type of white blood cell, in a given amount of blood. It is used to follow how well the immune system is doing in HIV.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
This dabrafenib and trametinib treatment arm is for adult, paediatric and TYA patients with cancers harbouring BRAF V600 mutations.
Drug: Dabrafenib · Drug: Trametinib
Adult patients (≥18 years) will receive dabrafenib at a dose of 150 mg (two 75 mg tablets) twice daily (total daily dose 300 mg) throughout each 28-day cycle. Paediatric patients (1 to \<12 years) will receive dabrafenib dose adjusted by body weight as 10 mg dispersible tablets orally twice daily throughout each 28-day cycle. Paediatric patients (12-15 years) and TYA patients (16 to \<18 years) will have the option to receive adult or paediatric dosing. Patients may continue until disease progression without clinical benefit, unacceptable AEs or withdrawal of consent.
Also known as: Tafinlar, Finlee
Adult patients (≥18 years) will receive trametinib at a daily dose of 2 mg (one 2 mg tablet) orally once daily (total daily dose 2 mg) throughout the 28-day cycle. Paediatric patients (1 to \<12 years) receive trametinib at a dose adjusted by body weight as 0.05 mg/m\^2 powder for oral solution once daily throughout each 28-day cycle. Paediatric patients (12-15 years) and TYA patients (16 to \<18 years) will have the option to receive adult or paediatric dosing. Patients may continue until disease progression without clinical benefit, unacceptable toxicity or withdrawal of consent.
Also known as: Mekinist, Spexotras
Objective response (OR)
OR is defined as the confirmed occurrence of either a complete response (CR) or partial response (PR) according to Response Evaluation Criteria in Solid Tumours (RECIST) Version 1.1 criteria (or immune \[i\]RECIST or standard imaging criteria for specific disease e.g. Response Evaluation in Neuro Oncology criteria \[RANO\]). In patients with leukaemia, OR will be defined as the occurrence of CR, CRi (CR with incomplete neutrophil recovery) or CRp (CR with incomplete platelet recovery). The trial will report the proportion of patients with an OR and 95% credible interval.
Time frame: Disease assessments to be performed up to 24 weeks from the start of trial treatment.
Durable Clinical Benefit (DCB)
DCB is defined as the absence of disease progression for at least 24 weeks from the start of trial treatment according to RECIST Version 1.1 criteria (or iRECIST or standard imaging criteria for specific disease e.g. RANO criteria) and, where relevant (e.g. for haematological malignancies), by standard bone marrow response criteria. Alternative definitions of DCB based on different time points may be pre-specified for particular sub-cohorts if 24 weeks is not clinically relevant. The trial will report the proportion of patients with a DCB and 95% credible interval.
Time frame: Disease assessments to be performed up to 24 weeks from the start of trial treatment.
Duration of response (DR)
DR is defined as the time from the date of the first confirmed CR or PR according to RECIST Version 1.1 criteria (or iRECIST) or standard imaging criteria for specific disease. The trial will report the median DR and 95% credible interval.
Time frame: Disease assessment performed every 2 cycles (each cycle is 28 days) and at EoT. After 24 weeks, it can be done every 12 weeks, on discussion with Sponsor. Follow-up visits are every 3 months after last dose, for up to 2 years.
Best percentage change in sum of target lesion/index lesion diameters (PCSD)
PCSD is defined as the greatest decrease or least increase in the sum of target lesion diameters (RECIST) or index lesion diameters (iRECIST) as a percentage compared to the baseline measurement. The trial will report the mean PCSD and 95% credible interval.
Time frame: Disease assessment performed every 2 cycles (each cycle is 28 days) and at EoT. After 24 weeks, it can be done every 12 weeks, on discussion with Sponsor. Follow-up visits are every 3 months after last dose, for up to 2 years.
Time to treatment discontinuation (TTD)
TTD is defined as the time from date of starting trial treatment to date of discontinuing trial treatment, in days estimated by the median of the posterior inverse gamma probability distribution. The trial will report the median TTD and 95% credible interval.
Time frame: From first dose of dabrafenib and trametinib to discontinuation of trial treatment up to 5 years.
Progression-Free Survival time (PFS)
PFS is defined as the time from date of starting trial treatment to date of progression or date of death without a previous progression recorded estimated by the median of the posterior inverse gamma probability distribution.
Time frame: Disease assessment performed every 2 cycles (each cycle is 28 days) and at EoT. After 24 weeks, it can be done every 12 weeks, on discussion with Sponsor. Follow-up visits are every 3 months after last dose, for up to 2 years.
Time to Progression (TTP)
TTP is defined as the time from date of starting trial treatment to date of progression or date of death without recorded progression censored rather than events. The trial will report the median TTP and 95% credible interval.
Time frame: Disease assessment performed every 2 cycles (each cycle is 28 days) and at EoT. After 24 weeks, it can be done every 12 weeks, on discussion with Sponsor. Follow-up visits are every 3 months after last dose, for up to 2 years.
Growth Modulation Index (GMI)
GMI is defined as the ratio of TTP with the trial protocol treatment to TTP on the most recent prior line of therapy. The trial will report the mean GMI and 95% credible interval.
Time frame: Disease assessment performed every 2 cycles (each cycle is 28 days) and at EoT. After 24 weeks, it can be done every 12 weeks, on discussion with Sponsor. Follow-up visits are every 3 months after last dose, for up to 2 years.
Overall Survival time (OS)
OS is defined as the time from date of starting trial treatment to date of death from any cause estimated by the median of the posterior normal probability distribution.
Time frame: Time of death or up to 2 years after the EoT visit.
Occurrence of at least one Suspected Unexpected Serious Adverse Reaction (SUSAR)
The trial will report the number of patients who experience at least one SUSAR to dabrafenib or trametinib.
Time frame: From the time of consent until 28 days after last dose of dabrafenib or trametinib (up to 5 years) or until patient starts another anti-cancer therapy, whichever came first. An average time frame will be presented with results entry.
Occurrence of at least one Grade 3, 4 or 5 dabrafenib and/or trametinib related AE
Number of patients who experience at least one dabrafenib and trametinib related Grade 3, 4 or 5 AE according to National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE) Version 5.0.
Time frame: From the time of consent until 28 days after last dose of dabrafenib and/or trametinib (up to 5 years) or until patient starts another anti-cancer therapy, whichever came first. An average time frame will be presented with results entry.
EORTC-QLQ-30-Standardised Area Under Summary Score Curve (QLQSAUC) in adult patients
For adult patients, multiple measures of Quality of Life (QoL) will be generated from patient completion of the European Organisation for Research and Treatment of Cancer QLQ-C30 (EORTC QLQ-C30) questionnaire (15 measures). For each patient the Summary Score from the questionnaire will be generated at each time point and the area under the curve generated by these scores over time will be calculated and standardised by the time frame. The trial will report the mean QLQSAUC and 95% credible interval.
Time frame: QoL surveys performed prior to inclusion, every cycle (each cycle is 28 days) and at EoT visit (up to 5 years).
EQ-5D Standardised Area Under Index Value Curve (EQ5DSAUC) in adult patients
For adult populations, two measures of QoL will be generated from patient completion of the EQ-5D-5L questionnaire. For each measure, scores based on responses from the questionnaire will be generated at each time point and the area under the curve generated by these scores over time will be calculated and standardised by the time frame. The trial will report the mean EQ5DSAUC and 95% credible interval.
Time frame: QoL surveys performed prior to inclusion, every cycle (each cycle is 28 days) and at EoT visit (up to 5 years).
Mean change from baseline in the PedsQL 4.0 Standardised Area Under Total Scale Score Curve (PedSAUC) in paediatric patients
For paediatric populations, multiple measures of QoL will be generated from patient completion of the PedsQL 4.0 (4 measures). The Summary Score from the questionnaire will be generated at each time point and the area under the curve generated by these scores over time will be calculated and standardised by the time frame. The trial will report the mean PedSAUC and the 95% credible interval.
Time frame: QoL surveys performed prior to inclusion, every cycle (each cycle is 21 days) and at EoT visit (up to 5 years).
Mean change from baseline in the PedsQL 4.0 Standardised Area Under total Scale Score Curve (PedsSAUC) in parents of paediatric patients
For paediatric populations, multiple measures of QoL will be generated from patient's parent completion of the PedsQL 4.0 (4 measures). The Summary Score from the questionnaire will be generated at each time point and the area under the curve generated by these scores over time will be calculated and standardised by the time frame. The trial will report the mean PedSAUC and the 95% credible interval.
Time frame: QoL surveys performed prior to inclusion, every cycle (each cycle is 21 days) and at EoT visit (up to 5 years).
Plan to share: Yes — Individual de-identified patient data will be shared with researchers whose proposed use of the data is approved by a review committee of the Sponsor. Supporting Information: Study Protocol Statistical Analysis Plan (SAP) Informed Consent Form (ICF)
Supporting information: Study protocol, Statistical analysis plan, Informed consent form
Time frame: All requests for data relating to this treatment arm that are made within 5 years from last patient last visit for the dabrafenib and trametinib treatment arm will be considered; requests made subsequently will be considered where possible.
Access criteria: When a request has been approved, Cancer Research UK will provide access to the de-identified individual patient-level data and appropriate supporting information. A signed Data Sharing Agreement must be in place before accessing requested information. Requests should be submitted to drugdev@cancer.org.uk.
Started Apr 2026 (actual). Primary completion is estimated for Oct 2029, 42 months after the start.
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Studies of the drugs tested here: Dabrafenib · Trametinib
Cancer Research UK