Polθ-IN-9 is an orally active Polθ polymerase inhibitor ( IC 50 = 9.6 nM, K d = 47.5 nM). Polθ-IN-9 shows remarkable selectivity with no inhibitory activity against other human DNA polymerases, including Pol α, Pol ε, Pol γ, Pol λ, and Pol μ. Polθ-IN-9 exhibits strong antiproliferative activity in DLD1 BRCA2 KO cells (IC 50 = 2.9 μM), and high sensitivity to MDA-MB-436 cells (IC 50 = 4.9 μM). Polθ-IN-9 increases DNA damage accumulation, induces γH2AX levels, and inhibits tumor growth in combination with Olaparib ( HY-10162 ), in the MDA-MB-436 xenograft model. Polθ-IN-9 can be used for the research of homologous recombination (HR)-deficient cancers such as breast cancer .
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