Niraparib tosylate monohyrate 也称为 MK-4827，是一种聚 (ADP-核糖) 聚合酶 (PARP) 抑制剂，具有潜在的抗肿瘤活性。 MK4827 抑制 PARP 活性，增强 DNA 链断裂的积累，促进基因组不稳定性和细胞凋亡。 PARP 蛋白家族通过碱基切除修复 (BER) 途径检测和修复单链 DNA 断裂。

Niraparib, also know as MK-4827, is an inhibitor of poly (ADP-ribose) polymerase (PARP) with potential antineoplastic activity. MK4827 inhibits PARP activity, enhancing the accumulation of DNA strand breaks and promoting genomic instability and apoptosis. The PARP family of proteins detect and repair single strand DNA breaks by the base-excision repair (BER) pathway.

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