David A Reardon1, Andrew B Lassman1, Martin van den Bent1, Priya Kumthekar1, Ryan Merrell1, Andrew M Scott1, Lisa Fichtel1, Erik P Sulman1, Erica Gomez1, JuDee Fischer1, Ho-Jin Lee1, Wijith Munasinghe1, Hao Xiong1, Helen Mandich1, Lisa Roberts-Rapp1, Peter Ansell1, Kyle D Holen1, Hui K Gan1. 1. Center for Neuro-Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts; Department of Neurology & Herbert Irving Comprehensive Cancer Center, Columbia University Medical Center, New York, New York; Neuro-Oncology Unit, Erasmus MC Cancer Center, Rotterdam, the Netherlands; Department of Neurology, Northwestern University, Chicago, Illinois; Department of Neurology, NorthShore University HealthSystem, Evanston, Illinois; Department of Medical Oncology, Austin Health and Olivia Newton-John Cancer Research Institute, Melbourne, Victoria, Australia; School of Cancer Medicine, La Trobe University School of Cancer Medicine, Melbourne, Victoria, Australia; South Texas Accelerated Research Therapeutics (START), San Antonio, Texas; Department of Radiation Oncology, The University of Texas M.D.Anderson Cancer Center, Houston, Texas; AbbVie Inc., North Chicago, Illinois; Department of Medicine, University of Melbourne, Melbourne, Victoria, Australia.
Abstract
BACKGROUND: The purpose of this study was to determine the maximum tolerated dose (MTD), recommended phase II dose (RPTD), safety, and pharmacokinetics of ABT-414 plus radiation and temozolomide in newly diagnosed glioblastoma. ABT-414 is a first-in-class, tumor-specific antibody-drug conjugate that preferentially targets tumors expressing overactive epidermal growth factor receptor (EGFR). METHODS: In this multicenter phase I study, patients received 0.5-3.2 mg/kg ABT-414 every 2 weeks by intravenous infusion. EGFR alterations, O6-methylguanine-DNA methyltransferase (MGMT) promoter hypermethylation, and isocitrate dehydrogenase (IDH1) gene mutations were assessed in patient tumors. Distinct prognostic classes were assigned to patients based on a Molecular Classification Predictor model. RESULTS: As of January 7, 2016, forty-five patients were enrolled to receive ABT-414 plus radiation and temozolomide. The most common treatment emergent adverse events were ocular: blurred vision, dry eye, keratitis, photophobia, and eye pain. Ocular toxicity at any grade occurred in 40 patients and at grades 3/4 in 12 patients. RPTD and MTD were set at 2 mg/kg and 2.4 mg/kg, respectively. Among 38 patients with pretreatment tumor tested centrally, 39% harbored EGFR amplification, of which 73% had EGFRvIII mutation. Among patients with available tumor tissue (n = 30), 30% showed MGMT promoter methylation and none had IDH1 mutations. ABT-414 demonstrated an approximately dose proportional pharmacokinetic profile. The median duration of progression-free survival was 6.1 months; median overall survival has not been reached. CONCLUSION: ABT-414 plus chemoradiation demonstrated an acceptable safety and pharmacokinetic profile in newly diagnosed glioblastoma. Randomized studies are ongoing to determine efficacy in newly diagnosed (NCT02573324) and recurrent glioblastoma (NCT02343406).
BACKGROUND: The purpose of this study was to determine the maximum tolerated dose (MTD), recommended phase II dose (RPTD), safety, and pharmacokinetics of ABT-414 plus radiation and temozolomide in newly diagnosed glioblastoma. ABT-414 is a first-in-class, tumor-specific antibody-drug conjugate that preferentially targets tumors expressing overactive epidermal growth factor receptor (EGFR). METHODS: In this multicenter phase I study, patients received 0.5-3.2 mg/kg ABT-414 every 2 weeks by intravenous infusion. EGFR alterations, O6-methylguanine-DNA methyltransferase (MGMT) promoter hypermethylation, and isocitrate dehydrogenase (IDH1) gene mutations were assessed in patient tumors. Distinct prognostic classes were assigned to patients based on a Molecular Classification Predictor model. RESULTS: As of January 7, 2016, forty-five patients were enrolled to receive ABT-414 plus radiation and temozolomide. The most common treatment emergent adverse events were ocular: blurred vision, dry eye, keratitis, photophobia, and eye pain. Ocular toxicity at any grade occurred in 40 patients and at grades 3/4 in 12 patients. RPTD and MTD were set at 2 mg/kg and 2.4 mg/kg, respectively. Among 38 patients with pretreatment tumor tested centrally, 39% harbored EGFR amplification, of which 73% had EGFRvIII mutation. Among patients with available tumor tissue (n = 30), 30% showed MGMT promoter methylation and none had IDH1 mutations. ABT-414 demonstrated an approximately dose proportional pharmacokinetic profile. The median duration of progression-free survival was 6.1 months; median overall survival has not been reached. CONCLUSION: ABT-414 plus chemoradiation demonstrated an acceptable safety and pharmacokinetic profile in newly diagnosed glioblastoma. Randomized studies are ongoing to determine efficacy in newly diagnosed (NCT02573324) and recurrent glioblastoma (NCT02343406).
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