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This study was aimed to design the first dual-target small-molecule inhibitor co-targeting poly(ADP-ribose)polymerase-1(PARP1)and bromodomain containing protein 4(BRD4),which had important cross relation in the global network of breast cancer,reflecting the synthetic lethal effect.A series of new BRD4 and PARP1 dual-target inhibitors were discovered and synthesized by fragment-based combinatorial screening and activity assays that together led to the chemical optimization.Among these compounds,19d was selected and exhibited micromole enzymatic potencies against BRD4 and PARP1,respectively.Compound 19d was further shown to efficiently modulate the expression of BRD4 and PARP1.Subsequently,compound 19d was found to induce breast cancer cell apoptosis and stimulate cell cycle arrest at G1 phase.Following pharmacokinetic studies,compound 19d showed its antitumor activity in breast cancer susceptibility gene 1/2(BRCA1/2)wild-type MDA-MB-468 and MCF-7 xeno-graft models without apparent toxicity and loss of body weight.These results together demonstrated that a highly potent dual-targeted inhibitor was successfully synthesized and indicated that co-targeting of BRD4 and PARP1 based on the concept of synthetic lethality would be a promising therapeutic strategy for breast cancer.