Abstract 4499: Cytotoxicity, biochemical activity, and structural analysis of ONC201 and comparisons to a biologically inactive isomer

We previously identified TRAIL-inducing compound 10 (TIC10), also known as NSC-350625, as a small molecule being developed under the name ONC201 that has potent anti-tumor efficacy and a benign safety profile in preclinical cancer models. Further investigation of the preclinical profile of this drug...

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Veröffentlicht in:Cancer research (Chicago, Ill.) Ill.), 2015-08, Vol.75 (15_Supplement), p.4499-4499
Hauptverfasser: Wagner, Jessica, Kline, Christina Leah, Pottorf, Richard S., Nallaganchu, Bhaskara Rao, Olson, Gary L., Dicker, David T., Allen, Joshua E., El-Deiry, Wafik S.
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Sprache:eng
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Zusammenfassung:We previously identified TRAIL-inducing compound 10 (TIC10), also known as NSC-350625, as a small molecule being developed under the name ONC201 that has potent anti-tumor efficacy and a benign safety profile in preclinical cancer models. Further investigation of the preclinical profile of this drug candidate led in early 2014 to the FDA acceptance of the investigational drug application (IND) for oral ONC201 to treat patients with advanced cancer. The initially disclosed chemical structure of ONC201 provided by Stahle et. al in an expired patent was described as an imidazo[1,2-a]pyrido[4,3-d]pyrimidine derivative. Our first report of its anticancer activity by Allen et. al. included mass spectrometry and 1H NMR that indicated both were consistent with the structure depicted by Stahle et. al and the National Cancer Institute. A recent publication reported that the structure of ONC201 differs from the initial description and is in fact an angular [3,4-e] isomer of the previously depicted structure. Here, we report X-ray crystallography and other structural studies of ONC201 produced by Oncoceutics in a dihydrochloride salt form for clinical use that confirm the angular [3,4-e] structure and indicate that the material is not a mixture of the two isomers. Furthermore, we confirm that although fragmentation by mass spectrometry for the isomers is identical, the angular [3,4-e] isomer can be definitively identified as ONC201 by implementing specific various spectroscopy techniques to identify differences between ONC201 and the linear isomer. In accordance with our structural analysis, in vitro activity assays in cancer cells indicate that the previously disclosed anti-cancer activity and mechanism of action are indeed associated exclusively with the [3,4-e] structure and not the [4,3-d] linear isomer. Together these studies confirm the angular [3,4-e] structure of ONC201 as the highly active and pure anti-cancer drug candidate that was utilized in prior preclinical pharmacology studies and is now entering clinical trials in several oncology indications. Citation Format: Jessica Wagner, Christina Leah Kline, Richard S. Pottorf, Bhaskara Rao Nallaganchu, Gary L. Olson, David T. Dicker, Joshua E. Allen, Wafik S. El-Deiry. Cytotoxicity, biochemical activity, and structural analysis of ONC201 and comparisons to a biologically inactive isomer. [abstract]. In: Proceedings of the 106th Annual Meeting of the American Association for Cancer Research; 2015 Apr 18-22; Phil
ISSN:0008-5472
1538-7445
DOI:10.1158/1538-7445.AM2015-4499