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• W2005470190 abstract "Abstract Aberrant activation of the Hedgehog (Hh) signaling pathway has been implicated in a variety of cancers and a small molecule inhibitor of Smoothened (SMO), Vismodegib, has been approved for the treatment of basal cell carcinoma, a disease frequently driven by Hh pathway signaling due to pathway mutations. SMO dependent Hh signaling has also been implicated in models of myeloid leukemia, primarily CML, where genetic loss of SMO or pharmacological inhibition limits disease progression in part through targeting the leukemic stem cell (LSC). Outside of BCR-ABL driven leukemia the role of Hh signaling and impact of SMO inhibition on disease progression and the LSC remains unclear. To explore the role of Hedgehog pathway signaling and interrogate responses to SMO inhibition in AML, a panel of primary AML patient-derived models was utilized to examine responses to PF-04449913, an oral small molecule SMO inhibitor currently in early phase clinical trials targeting myeloid malignancies. AML patient samples were characterized for Hh pathway expression levels and screened for responses to PF-04449913. Ex vivo treatment of AML bone marrow cells showed PF-04449913 was capable of inhibiting Hh pathway activity, reducing expression of key LSC regulators and decreasing populations of cells expressing LSC markers. Use of AML xenotransplant models to assess in vivo responses to PF-04449913 as single agent and in combination with Cytarabine have shown potential for combination efficacy of the two agents in select models suggesting patient selection strategies may be critical for SMO inhibitor-based therapies in AML. Citation Format: Amy Jackson-Fisher, Pamela Whalen, Mark Elliott, Melissa McMahon, Enhong Chen, Xianxian Zheng, Mark Ozeck, Donghui Huang, Paul Lira, Joseph Lee, Cathy Zhang, Justine Lam, Mary Spilker, Shibing Deng, Patrick Lappin, Penny Venne, Cynthia Heinlein, Annelie Schairer, Karen McLachlan, Todd VanArsdale. Interrogating hedgehog pathway and smoothened inhibition by PF-04449913 in patient-derived acute myeloid leukemia models. [abstract]. In: Proceedings of the 105th Annual Meeting of the American Association for Cancer Research; 2014 Apr 5-9; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2014;74(19 Suppl):Abstract nr 1958. doi:10.1158/1538-7445.AM2014-1958" @default.
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• W2005470190 date "2014-10-01" @default.
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• W2005470190 title "Abstract 1958: Interrogating hedgehog pathway and smoothened inhibition by PF-04449913 in patient-derived acute myeloid leukemia models" @default.
• W2005470190 doi "https://doi.org/10.1158/1538-7445.am2014-1958" @default.
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