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.
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 malignancy 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 childbearing potential 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 biopsy 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 hypersensitivity to dabrafenib or trametinib or any of the excipients. 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. Clinically significant cardiac or cerebrovascular disease as defined by:
Patients with a cerebrovascular event (including stroke or transient ischaemic attack [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 investigational 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 human immunodeficiency virus (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.
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, Sap, Icf
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