Abstract
The integrin antagonist cilengitide has been explored as an adjunct with anti-angiogenic properties to standard of care temozolomide chemoradiotherapy (TMZ/RT → TMZ) in newly diagnosed glioblastoma. Preclinical data as well as anecdotal clinical observations indicate that anti-angiogenic treatment may result in altered patterns of tumor progression. Using a standardized approach, we analyzed patterns of progression on MRI in 21 patients enrolled onto a phase 2 trial of cilengitide added to TMZ/RT → TMZ in newly diagnosed glioblastoma. Thirty patients from the experimental treatment arm of the EORTC/NCIC pivotal TMZ trial served as a reference. MRIcro software was used to map location and extent of initial preoperative and recurrent tumors on MRI of both groups into the same stereotaxic space which were then analyzed using an automated tool of image analysis. Clinical and outcome data of the cilengitide-treated patients were similar to those of the EORTC/NCIC trial except for a higher proportion of patients with a methylated O6-methylguanyl-DNA-methyltransferase gene promoter. Analysis of recurrence pattern revealed neither a difference in the size of the recurrent tumor nor in the distance of the recurrences from the preoperative tumor location between groups. Overall frequencies of distant recurrences were 20 % in the reference group and 19 % (4/21 patients) in the cilengitide group. Compared with TMZ/RT → TMZ alone, the addition of cilengitide does not alter patterns of progression. This analysis does not support concerns that integrin antagonism by cilengitide may induce a more aggressive phenotype at progression, but also provides no evidence for an anti-invasive activity of cilengitide in patients with newly diagnosed glioblastoma.
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Conflict of interest
The following authors disclose financial relationship with Merck KGaA (Darmstadt, Germany): Bart Neyns (research funding), Michael Weller (research funding and advisory role), Paul M Clément (payment for invited lectures and consultancy), Roger Stupp (consultancy), Jörg Tonn (advisory role and honoraria), Martin Picard (employment). Günter Eisele, Antje Wick, Anna-Carina Eisele, Ghazaleh Tabatabai, Dietmar Krex, Matthias Simon, Uwe Schlegel, Adrian Ochsenbein, Guido Nikkhah and Wolfgang Wick have no conflicts of interest to disclose.
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Günter Eisele and Antje Wick contributed equally to this work.
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Eisele, G., Wick, A., Eisele, AC. et al. Cilengitide treatment of newly diagnosed glioblastoma patients does not alter patterns of progression. J Neurooncol 117, 141–145 (2014). https://doi.org/10.1007/s11060-014-1365-x
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DOI: https://doi.org/10.1007/s11060-014-1365-x