A Study to Compare the Administration of Encorafenib + Binimetinib + Nivolumab Versus Ipilimumab + Nivolumab in BRAF-V600 Mutant Melanoma With Brain Metastases

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PRIMARY OBJECTIVE: I. To compare progression-free survival (PFS) per Response Evaluation Criteria in Solid Tumors (RECIST) 1.1 between participants randomized to the triplet combination of encorafenib + binimetinib + nivolumab versus the doublet combination of ipilimumab + nivolumab among participan...

PRIMARY OBJECTIVE: I. To compare progression-free survival (PFS) per Response Evaluation Criteria in Solid Tumors (RECIST) 1.1 between participants randomized to the triplet combination of encorafenib + binimetinib + nivolumab versus the doublet combination of ipilimumab + nivolumab among participants with BRAF-V600 mutant melanoma that has metastasized to the brain. SECONDARY OBJECTIVES: I. To estimate the overall survival (OS) of participants in each treatment arm. II. To estimate the objective response rate (ORR) (confirmed and unconfirmed, complete and partial responses) per RECIST 1.1 in each treatment arm. III. To estimate the intracranial response rate (ICRR), defined as confirmed and unconfirmed complete and partial response per modified RECIST for brain metastases (mRECIST). IV. To evaluate the duration of response, per RECIST 1.1 and the duration of ICRR per mRECIST, and per Response Assessment in Neuro-Oncology (RANO)-Brain Metastases (BM) (and immunotherapy [i]RANO) in each treatment arm. V. To evaluate the toxicity profile of each treatment arm. VI. To evaluate current and emerging radiographic response criteria (modified RECIST 1.1, modified RANO-BM and iRANO) by a retrospective blinded independent centralized review (BICR) of banked images. BANKING OBJECTIVE: I. To bank tumor tissue, cerebral spinal fluid (CSF), stool and blood samples for future correlative studies. OUTLINE: Patients are randomized to 1 of 2 arms. ARM I: Patients receive encorafenib orally (PO) once daily (QD) on days 1-28, binimetinib PO twice daily (BID) on days 1-28, and nivolumab intravenously (IV) on day 1. Cycles repeat every 28 days in the absence of disease progression or unacceptable toxicity. ARM II: Patients receive nivolumab IV on day 1 of all cycles and ipilimumab IV over 30 minutes on day 1 of cycles 1-4. Cycles repeat every 21 days for 4 cycles and then every 28 days in the absence of disease progression or unacceptable toxicity. After completion of study treatment, patients are followed up every 6 months for 2 years, and then annually until 3 years after randomization.

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