Niraparib, also known as MK4827, is an orally active, potent and selective poly(ADP-Ribose) polymerase (PARP) inhibitor that radiosensitizes human lung and breast cancer cells. Niraparib inhibits PARP1/PARP2 with IC50 of 3.8 nM/2.1 nM respectively. Niraparib is currently in Phase 3 clinical trials for ovarian cancer and BRCA+ breast cancer.
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