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• W2740808634 abstract "Background: ODM-207 is a potent and selective BET inhibitor that is structurally unrelated to the benzodiazepine-based inhibitors including JQ1, I-BET762, and OTX015. Phase I clinical trials have now been initiated with this agent based on its potent anti-tumor activity in various in vitro and in vivo models of hematologic malignancies and solid tumors. In view of the recent publications implicating a role for BET protein BRD4 in the suppression of PD-L1 expression, an immune checkpoint ligand for PD-1, we sought to evaluate ODM-207 for its effect on immune-mediated anti-tumor efficacy in pre-clinical models. Methods and Results: Mouse splenocytes were stimulated with anti-CD3 and anti-CD28 in the presence or absence of ODM-207 for four days and changes in immune cell population were analyzed by FACS. Results revealed an increase in the level of activated cytotoxic CD8+ T cells as indicated by increased intracellular IFNγ and granzyme B with ODM-207 treatment. After confirming the lack of direct anti-proliferative activity on the mouse colon carcinoma cell line CT26, in vivo evaluation of ODM-207 was carried out in the syngeneic CT26 subcutaneous tumor model established in BALB/c mice. Daily oral administration of ODM-207 at 30 mg/kg was well tolerated in this model and resulted in a statistically significant inhibition of tumor growth. Interestingly, the tumor growth inhibition observed with ODM-207 was comparable to that with a commercially available anti-mouse PD1 antibody. Studies to characterize the immune changes in the tumor and anti-tumor activity of ODM-207 in combination with an anti-mouse PD1 antibody are currently underway and the results will be presented. Conclusions: In summary, these studies demonstrate the anti-tumor activity of BET inhibitor in a syngeneic model of colon carcinoma in the absence of a direct anti-proliferative activity on tumor cells. Observed tumor growth inhibition correlated with the in vitro activation of cytotoxic CD8+ T cells supporting the immune-mediated effect leading to tumor growth inhibition. In view of the remarkable success with the immune-based therapeutic approaches, these findings are relevant in devising appropriate strategies for the continued clinical development of ODM-207. Citation Format: Pratima Deshpande, Ravi Krishna Babu, Prashant Yallappa Vadnal, Mahaboobi Jaleel, Murali Ramachandra, Chandrasekhar Abbineni, Susanta Samajdar, Anu-Maarit Moilanen, Pekka Kallio. Immune-mediated anti-tumor activity with a clinical stage BET bromodomain inhibitor ODM-207 in pre-clinical models [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2017; 2017 Apr 1-5; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2017;77(13 Suppl):Abstract nr LB-113. doi:10.1158/1538-7445.AM2017-LB-113" @default.
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• W2740808634 date "2017-07-01" @default.
• W2740808634 modified "2023-09-27" @default.
• W2740808634 title "Abstract LB-113: Immune-mediated anti-tumor activity with a clinical stage BET bromodomain inhibitor ODM-207 in pre-clinical models" @default.
• W2740808634 doi "https://doi.org/10.1158/1538-7445.am2017-lb-113" @default.
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