ERK1/2 Inhibitor Ulixertinib in Pancancer Patients with BRAF Fusions or Non-V600E/K Mutations: Results from the NCI-MATCH ECOG-ACRIN Trial (EAY131) Subprotocol Z1L

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PURPOSE: Mutations in BRAF at codons other than V600 (non-V600) and BRAF fusions confer dependence on RAF-MEK-ERK pathway. Subprotocol Z1L (EAY131-Z1L) investigated the clinical activity of ulixertinib (ERK1/2 inhibitor) in patients with tumors harboring these alterations. PATIENTS AND METHODS: In this single-arm study, patients with BRAF non-V600 mutation or BRAF fusion were given ulixertinib orally, at a dose of 600 mg twice daily, continuously for each 28-day cycle until progression or intolerability. The primary endpoint was objective response rate (ORR). Secondary endpoints included progression-free survival (PFS), 6-month PFS, and overall survival (OS). RESULTS: Among 34 eligible patients, median age was 66.5; 50% were female, 88% were white, 9% black, 3% Asian. ECOG PS 1 in 74% of patients. Median number of prior therapies was 4. Tumor types included multiple gastrointestinal malignancies (n = 16), lung cancer, melanoma (n = 3 each), among others. No patients achieved CR or PR, resulting in ORR = 0%. Stable disease was the best response in 7/26 centrally confirmed cases. Median PFS was 1.7 months (90% CI: 1.1, 2.2), 6-month PFS rate was 5% (90% CI: 0.6%, 17.7%), and median OS was 3.5 months (90% CI: 1.9, 5.4). Twenty patients (57%) had grade 3 toxicities, and one patient (3%) had grade 4 toxicity as their worst toxicity; there were no grade 5 toxicities. CONCLUSION: Ulixertinib had no demonstrable evidence of clinical activity in this small, heavily pretreated population of patients with tumors harboring BRAF fusions, or with non-V600E, non-V600K BRAF mutations.

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