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Description: INCB057643 is a novel, orally bioavailable BET inhibitor that has been tested in preclinical models of hematologic malignancies. INCB057643 is an analog of INCB054329 but with longer plasma half time which enables once a day dosing, while INCB054329 has to be dosed twice a day. INCB057643 inhibited binding of BRD2/BRD3/BRD4 to an acetylated histone H4 peptide in the low nM range, and was selective against other bromodomain containing proteins. In vitro analyses showed that INCB057643 inhibited proliferation of human AML, DLBCL, and multiple myeloma cell lines, with a corresponding decrease in MYC protein levels. Cell cycle analyses indicated that G1 arrest and a concentration-dependent increase in apoptosis were seen within 48 hours of treatment with INCB057643. Production of several cytokines, including IL-6, IL-10 and MIP-1alpha, was repressed by INCB057643 in human and mouse whole blood stimulated ex vivo with LPS. Consistent with these effects, analyses of gene expression in cells treated with INCB057643 revealed that pathways involved in cell cycle progression, apoptosis, and IL-6 were among the most significantly altered in vitro. Oral administration of INCB057643 resulted in significant anti-tumor efficacy in xenograft models of AML, myeloma, and DLBCL. Additionally, combining INCB057643 with standard of care agents used for the treatment of DLBCL including rituximab and bendamustine resulted in enhanced anti-tumor efficacy relative to that achieved with single agent therapies at doses that were well tolerated. In addition, many B cell malignancies are reliant on the PI3Kdelta pathway for proliferation and survival, suggesting that the combination of INCB057643 with the clinical stage PI3Kdelta specific inhibitor INCB050465 may be a rational therapeutic strategy for DLBCL. Compared with single agent BETi or PI3Kdeltai therapy, the combination significantly potentiated tumor growth inhibition in DLBCL models representative of the ABC subtype (HBL-1), and the double hit GCB subtype (WILL2). These data suggest that clinical exploration of INCB057643 as a monotherapy or in combination in hematologic malignancies is warranted.
References: AACR; Cancer Res 2017; 77(13 Suppl):Abstract nr 5071.
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