Neoadjuvant Dabrafenib + Trametinib for AJCC Stage IIIB-C BRAF V600 Mutation Positive Melanoma
Neoadjuvant Dabrafenib + Trametinib for AJCC Stage IIIB-C BRAF V600 Mutation Positive Melanoma
This is an open label, single centre, phase II study of neoadjuvant drug treatment with
 dabrafenib + trametinib in patients with resectable American Joint Committee on Cancer (AJCC)
 Stage IIIB-C BRAF V600 mutation positive melanoma.

 The main aim of this study is to find out if giving of a new combined drug treatment to
 patients with melanoma that has spread to the lymph nodes BEFORE they have surgery, will
 result in improved clinical and pathological response of the melanoma tissue after 12 weeks
 treatment.
Neoadjuvant therapy has been demonstrated to improve outcome in the management of patients of
 multiple different solid tumours. The advantage of a neoadjuvant therapy in melanoma is that
 it provides in vivo assessment of tumour responsiveness to systemic therapy, potentially
 eradicates micrometastatic disease, and may improve the surgical result. It also provides an
 opportunity to obtain tumour samples before and after treatment to study variation of
 response and effects of treatment on tumour characteristics.

 This pilot study explores pathological response rates, Response Evaluation Criteria in Solid
 Tumors (RECIST) response rates and biomarkers for a 12-week duration of neoadjuvant therapy
 with combined MAP kinase inhibition (MAPKi) with dabrafenib and trametinib and to establish
 guidelines for an expanded Phase II or III study.

 The biomarker component of this study will compare pre-treatment (PRE) with day 4-7, 'early
 during treatment' biopsies (EDT) and 12 week lymphadenectomy samples (POST). The tissue will
 be interrogated for immunologic, proteomic and genetic (RNA and DNA) features and changes in
 tissue and blood. The baseline PRE specimen will consist of at least two core, excisional or
 incisional biopsies taken prior to commencing combined dabrafenib and trametinib. The EDT
 specimen will consist of at least two core, excisional or incisional biopsies taken at days
 4-7, very early after commencing combined dabrafenib and trametinib. The POST specimen will
 be the complete lymph node dissection specimen performed after 12 weeks of treatment with
 combined dabrafenib and trametinib.

 The EDT specimen provides a unique opportunity to investigate the early changes that occur in
 a melanoma tumour with MAPK inhibitors that may set up for later resistance or complete
 response, and that may be amenable to therapeutic manipulation. For example, EDT samples
 collected on patients treated with single agent BRAF inhibitors showed increased T cell
 infiltrate that was associated with a better response in the lesion. The T cell infiltrate
 has also been associated with increased expression of melanoma antigens, a decrease in
 immunosuppressive cytokines [interleukin (IL)-6 and IL-8] and an increase in markers of
 T-cell cytotoxicity. Additional studies have shown the expected suppression in pERK, and in
 paired PRE-EDT samples, the decreased ERK suppression is associated with a better RECIST
 response. There have been no reports of the effects of BRAF and MEK inhibitors as single
 agent or in combination on responding melanoma tissue taken more than 15 days after
 commencement of treatment. As the median PFS for the combination of dabrafenib and trametinib
 is 9.4 months, >95% of the POST samples will be responding, and provide an opportunity to 1)
 compare the responding POST with the EDT sample (and the baseline PRE samples prior to
 treatment) to investigate how signalling pathways (as determined by RNA gene expression and
 protein expression) alter with time, and 2) how the changes in signalling pathways correlate
 with clinical and pathological response.

 Study treatment will be continued as adjuvant therapy. The goal is to improve the cure rate
 after surgery through eradication of occult micrometastatic disease. Notable successes have
 been achieved in oncology when highly effective therapies were available for advanced stage
 disease (e.g., breast cancer, Hodgkin's and non-Hodgkin's lymphoma, embryonal tumours,
 osteosarcoma). High-risk, resected BRAF V600 mutation positive melanoma represents another
 attractive setting for testing this paradigm since: 1) the population is at high risk for
 relapse and death without further therapy and 2) the BRAF/MAP-ERK kinase combination is
 highly effective in the metastatic setting and can be targeted to the population most likely
 to benefit. The study design will test the efficacy of study treatment in both the
 neoadjuvant and adjuvant settings for the first time in this patient population.

 Approximately 168 patients have received combination therapy with dabrafenib and trametinib
 at the proposed study doses (150 mg BID dabrafenib and 2 mg once daily trametinib) with a
 median follow-up time of 12.8 months. In the dose-escalation phase, PFS was longest for the
 group receiving the highest doses of dabrafenib and trametinib with an acceptable safety
 profile. Based on these data the combination of 150 mg BID of dabrafenib and 2.0 mg once
 daily of trametinib has been selected for this study. Mature randomized phase 2 trial (Part C
 in Figure 2 above) with a median follow up of 14.1 months showed a higher response rate (76%
 versus 54%, p=0.03) and a longer median PFS (9.4 months vs 5.8 months, hazard ratio (HR)
 0.39, p<0.001) in MAPK inhibitor-naïve patients on the combination of the full dose of
 dabrafenib and trametinib compared with dabrafenib monotherapy.

 The duration of therapy (12 months) is based upon expert consensus and does not exceed that
 administered in other pivotal studies of adjuvant treatment in similar populations where
 treatment ranged from 12 to 60 months. In the absence of a reliable biomarker for minimal
 residual disease, empiric dosing for durations much shorter than the predicted median relapse
 free interval (median of 15 months) may increase the risk of treatment failure. The design
 does include predictive biomarkers which may allow further refinement of dosing once a phase
 III study of this design has been completed. Safety of continuous dosing of dabrafenib and
 trametinib for over a year as monotherapies has been established along with preliminary
 safety of combination dosing for a similar interval. Safety precautions will include clear
 guidelines for management of toxicity, including enhanced surveillance for adverse events of
 special interest along with instructions for dose modification. The inclusion/exclusion
 criteria will also serve to minimize participation of those at greatest risk for known or
 suspected toxicities of the combination therapy.

 Neoadjuvant studies in patients with macroscopic stage III melanoma have been performed using
 the immunotherapies interferon and ipilimumab. Interferon has no activity in stage IV
 melanoma, yet there was an objective clinical response in 11 of 17 (55%) patients with stage
 III melanoma when given neoadjuvantly. Furthermore, 3/17 (15%) had a complete pathological
 response. Clinical responders had significantly greater increases in endotumoral CD11c and
 CD3 cells and significantly greater decreases in endotumoral CD83 cells compared with
 nonresponders. In contrast, ipilimumab confers an overall survival benefit for patients with
 stage IV melanoma over vaccine or chemotherapy, however the objective response rate is low at
 11-15%. In the neoadjuvant study with macroscopic stage III melanoma, pathological responses
 were not reported, however objective clinical responses were observed in 3/29 (10%) patients.
 Immune infiltrate cells were noted in most tumours after treatment with ipilimumab, and
 results correlating biomarker changes with response are awaited.

 In stage IV melanoma patients, over 73% of patients who respond to BRAF inhibitors, will
 achieve a RECIST response by the time of the first scan (8 weeks), and the median time to
 best response is 12 weeks in the poorest prognosis patients. The progression free survival
 (PFS) for the combination is 9.4 months, and <5% of patients have progression as their best
 RECIST response. Therefore, 12 weeks was chosen for the period of neoadjuvant combination
 therapy to optimise tumour shrinkage, without compromising patient safety.

 Surgeons at the Melanoma Institute Australia perform approximately 120 lymphadenectomies each
 year for patients with palpable lymphadenopathy. The sample size of 35 patients is achievable
 within the anticipated 12 to 18 month recruitment phase. Neoadjuvant therapy with combined
 dabrafenib + trametinib for these high-risk melanoma patients with bulky regional stage
 IIIB-C lymphadenopathy may result in improved rates and duration of local control with
 reduced surgical morbidity.

 Pyrexia Sub-Study Combined therapy with dabrafenib and trametinib is associated with pyrexia
 in over two-thirds of patients. There are no identifiable clinical correlates of pyrexia and
 the mechanism remains unknown. Management involves the use of corticosteroids in 25% of
 cases. Further investigations of this drug-associated pyrexia are urgently required,
 particularly for facilitating the use of these drugs in the adjuvant setting. The context of
 this single institution study with its close and uniform patient monitoring provides an ideal
 opportunity to study drug-induced pyrexia, its mechanisms, prevention and management, and
 correlation of pyrexia with parent drug and metabolite plasma levels compared with those who
 do not develop pyrexia.
Inclusion Criteria:

 -  Age ≥18 years

 -  Histologically confirmed AJCC Stage IIIB or IIIC (Tx, T1-4, N1b, N2b, N2c, N3, Mo)
 cutaneous melanoma or unknown primary determined to be BRAF V600 mutation positive,
 with sufficient nodal or in-transit disease to enable biopsies prior to
 surgery.Patients must have disease that is measurable per RECIST version 1.1

 -  Able to swallow and retain oral medication and must not have any clinically
 significant gastrointestinal abnormalities that may alter absorption

 -  Eastern Cooperative Oncology Group (ECOG) Performance Status of 0-1

 -  Adequate baseline organ function

 -  Women of childbearing potential must have a negative serum pregnancy test within 7
 days of first dose of study treatment and agree to use effective contraception from 14
 days prior to commencing study treatment, throughout the treatment period and for 4
 months after the last dose of study treatment

 -  Men with any female partner of childbearing potential must agree to use effective
 contraception from 14 days prior to commencing study treatment, throughout the
 treatment period and for 4 months after the last dose of study treatment

 Exclusion Criteria:

 -  Known mucosal or ocular melanoma or any unresectable in-transit metastases

 -  Evidence of distant metastatic disease on screening evaluation

 -  Prior anti-cancer treatment for melanoma (chemotherapy, immunotherapy, biologic
 therapy, vaccine therapy, investigational treatment or radiotherapy). Prior surgery
 for melanoma is allowed.

 -  Taken an investigational drug within 28 days or 5 half-lives, whichever is longer,
 prior to commencing study treatment.

 -  Current or expected use of a prohibited medication(s)

 -  Known immediate or delayed hypersensitivity reaction or idiosyncrasy to drugs
 chemically related to the study treatments, their excipients, and/or dimethyl
 sulfoxide (DMSO)

 -  Known HIV

 -  A history of known glucose-6-phosphate dehydrogenase (G6PD) deficiency

 -  History of another malignancy or a concurrent malignancy except:

 1. Patients who have been disease-free for 3 years and have a life expectancy of > 5
 years;

 2. Patients with a history of completely resected non-melanoma skin cancer or
 successfully treated in situ carcinoma are eligible, for example cervical cancer
 in situ, atypical melanocytic hyperplasia or melanoma in situ, multiple primary
 melanomas.

 -  A history or evidence of cardiovascular risk including any of the following: a. QT
 interval corrected for heart rate using the Bazett's formula ≥480 msec or ≥ 450 msec
 for patients with bundle branch block; b. History or evidence of current clinically
 significant uncontrolled arrhythmias; c. History of acute coronary syndromes
 (including myocardial infarction or unstable angina), coronary angioplasty, or
 stenting within 6 months prior to commencement of study treatment; d. History or
 evidence of current ≥ Class II congestive heart failure; e. Abnormal cardiac valve
 morphology documented by echocardiogram which in the opinion of the investigator could
 interfere with the patient's safety.

 f. Treatment refractory hypertension defined as a blood pressure of systolic > 140 mm
 Hg and/or diastolic > 90 mm Hg which cannot be controlled by anti-hypertensive
 therapy.

 -  A history or current evidence/risk of retinal vein occlusion (RVO) or central serous
 retinopathy (CSR)

 -  Any serious or unstable pre-existing medical conditions (aside from the malignancy
 exceptions specified above), psychiatric disorders, or other conditions that, in the
 opinion of the treating clinician, could interfere with the patient's safety,
 obtaining informed consent, or compliance with study procedures.

 -  Breastfeeding females