Reference Detail

Ref Type

Journal Article

PMID

(29075855)

Authors

van den Bent M, Gan HK, Lassman AB, Kumthekar P, Merrell R, Butowski N, Lwin Z, Mikkelsen T, Nabors LB, Papadopoulos KP, Penas-Prado M, Simes J, Wheeler H, Walbert T, Scott AM, Gomez E, Lee HJ, Roberts-Rapp L, Xiong H, Bain E, Ansell PJ, Holen KD, Maag D, Reardon DA

Title

Efficacy of depatuxizumab mafodotin (ABT-414) monotherapy in patients with EGFR-amplified, recurrent glioblastoma: results from a multi-center, international study.

Journal	Vol	Issue	Date	Pages	Journal Short Title
Cancer chemotherapy and pharmacology	80	6	2017 Dec	1209-1217	Cancer Chemother Pharmacol

URL

Abstract Text

Patients with recurrent glioblastoma (rGBM) have a poor prognosis. Epidermal growth factor receptor (EGFR) gene amplification is present in ~ 50% of glioblastomas (GBMs). Depatuxizumab mafodotin (depatux-m), formerly ABT-414, is an antibody-drug conjugate that preferentially binds cells with EGFR amplification, is internalized and releases a potent antimicrotubule agent, monomethyl auristatin F (MMAF). Here we report the safety, pharmacokinetics, and efficacy of depatux-m monotherapy at the recommended Phase 2 dose (RPTD) in patients with EGFR-amplified, rGBM.M12-356 (NCT01800695) is an open-label study with three escalation and expansion cohorts. Sixty-six patients with EGFR-amplified, rGBM were treated with depatux-m monotherapy at 1.25 mg/kg intravenously every 2 weeks. Adults with measurable rGBM, who were bevacizumab-naïve, with EGFR amplification were eligible.Among 66 patients, median age was 58 years (range 35-80). All patients were previously treated with radiotherapy/temozolomide. The most common adverse events (AEs) were eye related (91%), including blurred vision (65%), dry eye (29%), keratitis, and photophobia (27% each). Grade 3/4 AEs occurred in 42% of all patients, and ocular Grade 3/4 AEs occurred in 33% of patients overall. One patient (2%) had a Grade 4 ocular AE. Ocular AEs were manageable and usually resolved once treatment with depatux-m ceased. The objective response rate was 6.8%, the 6-month progression-free survival rate was 28.8%, and the 6-month overall survival rate was 72.5%.Depatux-m monotherapy displayed frequent but mostly Grade 1/2 ocular toxicities. A PFS6 of 28.8% was observed in this rGBM population, warranting further study.

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Molecular Profile	Treatment Approach

Gene Name	Source	Synonyms	Protein Domains	Gene Description	Gene Role

Therapy Name	Drugs	Efficacy Evidence	Clinical Trials
Depatuxizumab mafodotin	Depatuxizumab mafodotin	0	3

Drug Name	Trade Name	Synonyms	Drug Classes	Drug Description
Depatuxizumab mafodotin		ABT-414\|depatux-m	EGFR Antibody 56	Depatuxizumab mafodotin (ABT-414) is an antibody-drug conjugate comprising an EGFR-targeted antibody linked to an anti-microtubule drug, which delivers the cytotoxic agent to EGFR-expressing cells, potentially resulting in increased tumor cell death and decreased growth of EGFR-overexpressing tumors (PMID: 26846818, PMID: 29075855, PMID: 31747009, PMID: 32371586).

Gene	Variant	Impact	Protein Effect	Variant Description	Associated with drug Resistance

Molecular Profile	Indication/Tumor Type	Response Type	Therapy Name	Approval Status	Evidence Type	Efficacy Evidence	References