Abstract 4886: Patients withEGFRamplification but withoutEGFRvIIIexpression have improved benefit compared to those withEGFRvIIIexpression in samples of the INTELLANCE2/EORTC1410 randomized phase II trial

Background: Depatux-M (ABT-414) is an antibody-drug-conjugate consisting of an antibody (ABT-806) bound to the toxin monomethylauristatin-F. A randomized phase II trial on EGFR-amplified recurrent glioblastomas (GBMs) showed an improvement (p=0.06 in the primary analysis, p=0.024 in follow-up analysis) in overall survival in the Depatux-M+TMZ arm when compared to the control arm (CCNU or TMZ). In this study, we performed targeted next generation sequencing and correlated molecular features with response to treatment in order to better identify patients that benefit from the combination. Material and Methods: DNA and RNA was isolated from samples, collected at initial diagnosis, and selected for regions with highest tumor content. Target selection was done using the Trusight 170 gene panel (Illumina) which interrogates somatic variants and copy number, RNA levels and fusion genes in a set of known cancer genes. Variant calling was done using the Illumina Basespace sequence hub. For this trial, patients were eligible with centrally confirmed EGFR amplification, defined as EGFR/CEP 7 (centromere) ratio ≥ 2 in 15% of cells (FISH). Results: DNA and RNA data were generated from 233 and 234 samples respectively (of the 260 study patients). High-copy gene amplification was detected in EGFR (n=202), MDM2 (n=20), MDM4 (n=22), CDK4 (n=24) and CDK6 (n=5) which correlated with high expression levels. With this assay, 17 tumors did not show EGFR copy number (cn) aberrations (cn Conclusion: Depatux-M in combination with TMZ showed a trend towards improved OS in EGFR amplified recurrent glioblastoma. This trend may be greater for subjects with an absence of EGFRvIII expression. Citation Format: Pim J. French, Johan M. Kros, Iris de Heer, Marica Eoli, Juan Manuel Sepulvada, Annemiek Walenkamp, Jean-Sebastian Frenel, Alba Brandes, Paul Clement, Michael Weller, Peter Ansell, Jim Looman, Earle Bain, Lisa Roberts-Rapp, Marie Morfouace, Thierry Gorlia, Vassilis Golfinopoulos, Martin van den Bent. Patients with EGFR amplification but without EGFRvIII expression have improved benefit compared to those with EGFRvIII expression in samples of the INTELLANCE2/EORTC1410 randomized phase II trial [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2019; 2019 Mar 29-Apr 3; Atlanta, GA. Philadelphia (PA): AACR; Cancer Res 2019;79(13 Suppl):Abstract nr 4886.