Last updated on August 2020

Dabrafenib Combined With Trametinib After Radiation Therapy in Treating Patients With Newly-Diagnosed High-Grade Glioma


Brief description of study

This phase II trial studies how well the combination of dabrafenib and trametinib works after radiation therapy in children and young adults with high grade glioma who have a genetic change called BRAF V600 mutation. Radiation therapy uses high energy rays to kill tumor cells and reduce the size of tumors. Dabrafenib and trametinib may stop the growth of tumor cells by blocking BRAF and MEK, respectively, which are enzymes that tumor cells need for their growth. Giving dabrafenib with trametinib after radiation therapy may work better than treatments used in the past in patients with newly-diagnosed BRAF V600-mutant high-grade glioma.

Detailed Study Description

PRIMARY OBJECTIVE:

I. To estimate the event-free survival (EFS) distribution for newly-diagnosed patients with BRAFV600-mutant high-grade glioma (HGG) without H3 K27M mutations excluding anaplastic pleomorphic xanthoastrocytoma (aPXA) and anaplastic ganglioglioma (aGG) treated with radiation therapy followed by a maintenance combination of dabrafenib mesylate (dabrafenib) and trametinib dimethyl sulfoxide (trametinib) and to compare this EFS to contemporary historical controls.

SECONDARY OBJECTIVES:

I. To describe the overall survival (OS) distribution for newly-diagnosed patients with BRAFV600-mutant HGG without H3 K27M mutations excluding aPXA and aGG treated with radiation therapy followed by a maintenance combination of dabrafenib and trametinib.

II. To describe the EFS and overall survival (OS) distribution for newly-diagnosed patients with BRAFV600E-mutant aPXA and aGG without H3 K27M mutations treated with radiation therapy followed by a maintenance combination of dabrafenib and trametinib.

III. To define and evaluate the toxicities of combination therapy with dabrafenib and trametinib after radiation therapy in newly-diagnosed patients with HGG.

EXPLORATORY OBJECTIVE:

I. To bank tumor specimens and body fluids (blood, urine and cerebrospinal fluid) for future studies.

OUTLINE

Patients undergo standardized local radiation therapy (RT) 5 days a week (Monday-Friday) for 6-7 weeks. Four weeks after completion of RT, patients receive dabrafenib mesylate orally (PO) twice daily (BID) and trametinib dimethyl sulfoxide PO once daily (QD) on days 1-28. Treatment repeats every 28 days for up to 24 cycles in the absence of disease progression or unacceptable toxicity.

After completion of study treatment, patients are followed up at disease relapse, every 3 months for year 1, every 4 months for year 2, every 6 months for year 3, then annually for years 4-5.

Clinical Study Identifier: NCT03919071

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Recruitment Status: Open


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