Neoadjuvant BRAF (dabrafenib) and MEK (trametinib) inhibition for high-risk resectable stage III and IV melanoma.

Authors

null

Jennifer Ann Wargo

The University of Texas MD Anderson Cancer Center, Houston, TX

Jennifer Ann Wargo , Rodabe Navroze Amaria , Merrick I. Ross , Robyn P.M. Saw , Jeffrey E. Gershenwald , Patrick Hwu , Sapna Pradyuman Patel , Isabella Claudia Glitza , Adi Diab , Richard Kefford , Richard A Scolyer , Helen Rizos , John F Thompson , Kerwin Shannon , Andrew Spillane , Matteo S. Carlino , Alex Guminski , Lauren Simpson , Michael A. Davies , Georgina V. Long

Organizations

The University of Texas MD Anderson Cancer Center, Houston, TX, Melanoma Institute Australia, Sydney, Australia, Crown Princess Mary Cancer Centre, Sydney, Australia, Royal Prince Alfred Hospital/Melanoma Institute Australia/University of Sydney, Sydney, Australia, Westmead Millennium Institute, The University of Sydney, Sydney, Australia, Melanoma Institute Australia; Royal Prince Alfred Hospital, The University of Sydney, Sydney, Australia, Westmead Hospital, Baulkham Hills, Australia, Melanoma Institute Australia and The University of Sydney, North Sydney, Australia

Research Funding

Pharmaceutical/Biotech Company

Background: Significant advances have been made in the treatment of melanoma through the use of mitogen -activated protein kinase pathway (MAPK)-targeted therapies, with several agents now FDA-approved for patients (pts) with BRAF V600 mutations with stage IV or unresectable stage III disease. Based on the efficacy of BRAF inhibitors and combined BRAF/MEK inhibitors in patients with stage IV melanoma, these agents are being investigated as adjuvant therapy in patients with resectable stage III melanoma as part of multi-national phase 3 trials, where the current standard of care is upfront surgery. Mature results from these trials, however, will not be available for some time. A critical question to consider is whether neoadjuvant treatment with MAPK-targeted therapy will improve outcomes in a subset of these patients with significant burden of disease. Methods: Here we report 2 current phase II trials -- at MD Anderson Cancer Center (MD Anderson) and Melanoma Institute Australia (MIA) -- of neoadjuvant combined BRAF inhibition (dabrafenib, at 150 mg by mouth twice a day) and MEK inhibition (trametinib, at 2 mg by mouth once a day) for high risk resectable metastatic melanoma (stage IIIB-C; MIA and MD Anderson) and oligometastatic stage IV (MD Anderson)). Both trials incorporate serial biopsies during the course of treatment for translational research on molecular and immune biomarkers. At MD Anderson, eligible patients are randomized in a 2:1 fashion to neoadjuvant BRAF/MEK x 8 weeks with adjuvant BRAF/MEK x 44 weeks versus upfront surgery and SOC adjuvant therapy (target accrual 84 patients). Endpoints include RECIST response (RR), relapse-free survival (RFS), overall survival (OS), pathologic CR rate, and toxicity. At MIA, all patients receive neoadjuvant BRAF/MEK x 12 weeks, followed by adjuvant BRAF/MEK for 40 weeks (target accrual 35 patients). The primary endpoint is pathologic CR rate, secondary endpoints include RFS, OS, toxicity, and translational endpoints correlated with outcome. This neoadjuvant approach has the potential to establish a new treatment paradigm for patients with high-risk resectable metastatic melanoma harboring a BRAF mutation. Clinical trial information: NCT01972347, NCT02231775

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Abstract Details

Meeting

2015 ASCO Annual Meeting

Session Type

Poster Session

Session Title

Melanoma/Skin Cancers

Track

Melanoma/Skin Cancers

Sub Track

Melanoma/Skin Cancers

Clinical Trial Registration Number

NCT01972347, NCT02231775

Citation

J Clin Oncol 33, 2015 (suppl; abstr TPS9091)

DOI

10.1200/jco.2015.33.15_suppl.tps9091

Abstract #

TPS9091

Poster Bd #

328a

Abstract Disclosures