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The stay aims to determine whether switching from targeted therapy to immunotherapy based on a decrease in levels of circulating tumour DNA in the blood, will improve the outcome in melanoma patients.
Full description
The optimal scheduling of targeted and immune therapies in metastatic melanoma is unknown. At present, patients are treated with targeted therapy until acquired resistance develops, and then switched to immune therapy. Pre-clinical data has revealed that BRAF inhibition results in an environment that can enhance immune responses. Tumours responding to BRAF inhibitors but not resistant have been shown to have increased T cell infiltration, improved T cell recognition of melanoma associated antigens and reduced production of immunosuppressive cytokines. Furthermore, in response to targeted therapy LDH levels, which are associated with decreased response to immune therapy reduces, which may improve efficacy of immunotherapy.
A precise definition of response is required in order to decide upon a switch to immune therapy. A radiological definition of response is currently the standard assessment. However a scan at a fixed time point of 2 or 3 months does not reflect the wide range of response dynamics or allow decision making on an individual patient basis. The investigators have developed techniques using circulating tumour DNA (ctDNA) in the metastatic setting, which are able to accurately monitor tumour burden over time.
The aim of this pilot study is to provide a signal as to whether:
Data from this study will provide the basis for follow on studies with sufficient power to assess whether tumours responding to BRAF inhibition as defined by response in ctDNA can improve efficacy of immune therapy.
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Inclusion criteria
Exclusion criteria
Prior systemic anti-cancer treatment (immune therapy, targeted therapy, vaccine therapy, or investigational treatment) for unresectable Stage III or Stage IV melanoma.
Prior adjuvant therapy with BRAF +/- MEK inhibitor or adjuvant therapy with combination PD-1 inhibitor plus CTLA-4 inhibitor. Prior adjuvant therapy with PD-1 inhibitor is allowed so long as relapse occurred > 6 months from discontinuation of treatment and treatment not stopped due to grade 3 or 4 toxicity.
Current use of a prohibited medication
History of another malignancy. Exception: patients who have been disease-free for 3 years, (i.e. patients with second malignancies that are indolent or definitively treated at least 3 years ago) or patients with a history of completely resected non-melanoma skin cancer. No additional therapy should be required whilst the patient is on study.
Any serious or unstable pre-existing medical conditions (aside from malignancy exceptions specified above), psychiatric disorders, or other conditions that could interfere with the patients safety, obtaining informed consent, or compliance with study procedures.
Known Human Immunodeficiency Virus (HIV), Hepatitis B Virus (HBV), or Hepatitis C Virus (HCV) infection (patients with laboratory evidence of cleared or chronic (not active) HBV and HCV infection will be permitted).
A history of glucose-6-phosphate dehydrogenase (G6PD) deficiency.
Patients with active, known or suspected autoimmune disease. Patients with type 1 diabetes mellitus, hypothyroidism only requiring hormone replacement, skin disorders (such as vitiligo, psoriasis or alopecia) not requiring systemic treatment, or conditions not expected to recur in the absence of an external trigger will be permitted to enrol.
Patients with a condition requiring systemic treatment with either corticosteroids (>10 mg daily prednisone equivalent) or other immunosuppressive medications within 14 days of study drug administration. Inhaled or topical steroids and adrenal replacement steroid doses > 10 mg daily prednisone equivalent are permitted in the absence of active autoimmune disease.
Patients with interstitial lung disease that is symptomatic or may interfere with the detection or management of suspected drug-related pulmonary toxicity.
Brain metastases and leptomeningeal metastases are excluded unless:
No enzyme inducing anticonvulsants for ≥ 4 weeks prior to randomisation
Coronary syndromes (including myocardial infarction within 6 months or unstable angina)
A history or evidence of current ≥ Class II congestive heart failure as defined by the New York Heart Association (NYHA) guidelines with an ejection fraction of <50%
Treatment refractory hypertension defined as a blood pressure of systolic> 150 mmHg and/or diastolic > 95 mm Hg on >3 occasions which cannot be controlled by anti-hypertensive therapy;
Known cardiac metastases;
Uncorrectable electrolyte abnormalities (e.g. hypokalaemia, hypomagnesaemia, hypocalcaemia), long QT syndrome or taking medicinal products known to prolong the QT interval.
A history or current evidence/risk of retinal vein occlusion (RVO) or central serous retinopathy (CSR) including presence of predisposing factors to RVO or CSR (e.g., uncontrolled glaucoma or ocular hypertension, uncontrolled hypertension, uncontrolled diabetes mellitus, or a history of hyperviscosity or hypercoagulability syndromes)
Known immediate or delayed hypersensitivity reaction or idiosyncrasy to drugs chemically related to the study treatments including monoclonal antibodies, their excipients, and/or dimethyl sulfoxide (DMSO) and/or Polysorbate-80-containing infusions.
Females who are breast-feeding.
Prisoners or patients who are involuntarily incarcerated.
Patients who are compulsorily detained for treatment of either a psychiatric or physical (e.g., infectious disease) illness.
Primary purpose
Allocation
Interventional model
Masking
21 participants in 2 patient groups
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Central trial contact
Rebecca Lee; Matthew Smyth
Data sourced from clinicaltrials.gov
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