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Title: Efficacy and safety results of ABT-414 in combination with radiation and temozolomide in newly diagnosed glioblastoma
Authors: Reardon, David A;Lassman, Andrew B;van den Bent, Martin;Kumthekar, Priya;Merrell, Ryan;Scott, Andrew M;Fichtel, Lisa;Sulman, Erik P;Gomez, Erica;Fischer, JuDee;Lee, Ho-Jin;Munasinghe, Wijith;Xiong, Hao;Mandich, Helen;Roberts-Rapp, Lisa;Ansell, Peter;Holen, Kyle D;Gan, Hui K
Issue Date: 1-Jul-2017
EDate: 2016-12-30
Citation: Neuro-Oncology 2016; 19(7): 965-975
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).
DOI: 10.1093/neuonc/now257
PubMed URL:
Type: Journal Article
Subjects: ABT-414
Antibody-drug conjugate
Appears in Collections:Journal articles

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