Niraparib (MK-4827)

For research use only. Not for use in humans.

Catalog No.S2741

20 publications

Niraparib (MK-4827) Chemical Structure

Molecular Weight(MW): 320.39

Niraparib (MK-4827) is a selective inhibitor of PARP1/2 with IC50 of 3.8 nM/2.1 nM, with great activity in cancer cells with mutant BRCA-1 and BRCA-2. It is >330-fold selective against PARP3, V-PARP and Tank1. Phase 3.

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Selleck's Niraparib (MK-4827) has been cited by 20 publications

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Biological Activity

Description Niraparib (MK-4827) is a selective inhibitor of PARP1/2 with IC50 of 3.8 nM/2.1 nM, with great activity in cancer cells with mutant BRCA-1 and BRCA-2. It is >330-fold selective against PARP3, V-PARP and Tank1. Phase 3.
PARP2 [1]
(Cell-free assay)
PARP1 [1]
(Cell-free assay)
2.1 nM 3.8 nM
In vitro

In a whole cell assay, MK-4827 inhibited PARP activity with EC50 = 4 nM and inhibited proliferation of cancer cells with mutant BRCA-1 and BRCA-2 with CC50 in the 10-100 nM range. It was demonstrated to be a potent and selective PARP-1 and PARP-2 inhibitor with IC50=3.8 and 2.1 nM, respectively. Furthermore, it displayed at least a 100-fold selectivity over PARP-3, V-PARP, and tankyrase-1, with IC50 = 1300, 330, and 570 nM, respectively. As well as inhibiting the growth of HeLa cell lacking BRCA-1 because of silencing by RNA interference, MK-4827 is able to inhibit the proliferation of cancer cell lines carrying natural BRCA-1 or BRCA-2 mutations. In MDA-MB-436 human mammary gland adenocarcinoma cells carrying BRCA-1 mutations, MK-4827 displayed CC50 = 18 nM, while in CAPAN-1 human pancreatic adenocarcinoma cells, which are BRCA-2 mutant, MK-4827 displayed CC50 = 90 nM. In contrast, normal human prostate and mammary epithelial cells are resistant to MK-4827, displaying antiproliferative effects in the micromolar range, thereby demonstrating the very high selective cytotoxicity from these PARP inhibitors in BRCA-1 and -2 mutant cancer cells compared to surrounding tissue[2].

Cell Data
Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID
HeLa cells MXHGeY5kfGmxbjDhd5NigQ>? NFvwbmhKdmirYnn0bY9vKG:oIGDBVnAhcW5iaInkdo9o\W5icHXyc5hq\GVvaX7keYNm\CCqdX3hckBJ\UyjIHPlcIx{KGG|c3Xzd4VlKGG|IHnubIljcXSrb36gSG5CNWSjbXHn[U1qdmS3Y3XkJHBCWnmuYYTpc44tKEWFNUC9NE4xODRizszN NV7ubm5GOTl6N{O5PFE>
A549 cells MWfDfZRwfG:6aXPpeJkh[XO|YYm= M4GzclUuPyCmYYnz NICxepREgXSxdH;4bYNqfHliYXfhbY5{fCCqdX3hckBCPTR7IHPlcIx{KHS{YX7z[oVkfGWmIIfpeIghSlKFQUKgd4hTVkFiYYPz[ZN{\WRiYYOgbY5pcWKrdHnvckBw\iClZXzsJJBzd2yrZnXyZZRqd25iYX\0[ZIhPSC2bzC3JIRigXNiYomgR4VtdFSrdHXyMWJtfWViYYPzZZktKEOFNUC9NE4xOTFizszN NVG0Zo97OjV5NkGwPVY>
MDA-MB-436 cells M4f3ZnBzd2yrZnXyZZRqd25iYYPzZZk> NIDHTpg3KGSjeYO= M4XyW2FvfGmycn;sbYZmemG2aY\lJIFkfGm4aYT5JIFo[Wmwc4SgbJVu[W5iTVTBMW1DNTR|NjDj[YxteyCneIDy[ZN{cW6pIFLSR2EyKDV|OU[gL{AyTz6DIH31eIFvfCCjZoTldkA3KGSjeYOgZpkh[2WubDD0bZRmei2kbIXlJIF{e2G7LDDDR|UxRTF6IH7N MlfsNVk5PzN7OEG=
SUM1315MO2 cells MlyxR5l1d3SxeHnjbZR6KGG|c3H5 NHr1W5kyOiCmYYnz MULDfZRwfG:6aXPpeJkh[WejaX7zeEBpfW2jbjDTWW0yOzF3TV:yJINmdGy|IHPhdpJ6cW6pIFLSR2EyKG23dHHueEBie3Onc4Pl[EBieyCrbnjpZol1cW:wIH;mJINmdGxicILvcIln\XKjdHnvckBi\nSncjCxNkBl[Xm|IHL5JGNmdGyWaYTldk1DdHWnIHHzd4F6NCCFQ{WwQVAvODJizszN NG\qT4wzPTd4MUC5Oi=>
DoTc2-4510 cells MoHHR5l1d3SxeHnjbZR6KGG|c3H5 MlzFOU04KGSjeYO= MWnDfZRwfG:6aXPpeJkh[WejaX7zeEBpfW2jbjDEc3RkOi12NUGwJINmdGy|IHPhdpJ6cW6pIFLSR2EzKG23dHHueEBie3Onc4Pl[EBieyCrbnjpZol1cW:wIH;mJINmdGxicILvcIln\XKjdHnvckBi\nSncjC1JJRwKDdiZHH5d{BjgSCFZXzsWIl1\XJvQnz1[UBie3OjeTygR2M2OD1yLkCyN{DPxE1? M1zn[FI2PzZzMEm2
SUM149PT cells MULDfZRwfG:6aXPpeJkh[XO|YYm= MkC4OU04KGSjeYO= MV\DfZRwfG:6aXPpeJkh[WejaX7zeEBpfW2jbjDTWW0yPDmSVDDj[YxteyClYYLyfYlv\yCEUlPBNUBufXSjboSgZZN{\XO|ZXSgZZMhcW6qaXLpeIlwdiCxZjDj[YxtKHC{b3zp[oVz[XSrb36gZYZ1\XJiNTD0c{A4KGSjeYOgZpkhS2WubGTpeIVzNUKudXWgZZN{[XluIFPDOVA:OC5yMkSg{txO M{frO|I2PzZzMEm2
UWB1.289 cells MlHvR5l1d3SxeHnjbZR6KGG|c3H5 NXvn[49nPS15IHThfZM> MXLDfZRwfG:6aXPpeJkh[WejaX7zeEBpfW2jbjDVW2IyNjJ6OTDj[YxteyClYYLyfYlv\yCEUlPBNUBufXSjboSgZZN{\XO|ZXSgZZMhcW6qaXLpeIlwdiCxZjDj[YxtKHC{b3zp[oVz[XSrb36gZYZ1\XJiNTD0c{A4KGSjeYOgZpkhS2WubGTpeIVzNUKudXWgZZN{[XluIFPDOVA:OC5yNU[g{txO NYWxSVJSOjV5NkGwPVY>
Capan1 cells Mnf6R5l1d3SxeHnjbZR6KGG|c3H5 M1Hac2N6fG:2b4jpZ4l1gSCjZ3HpcpN1KEKUQ1GyMYRm\mmlaXXueEBpfW2jbjDDZZBidjFiY3XscJMtKEOFNUC9NE4xQSEQvF2= MonwNlU4PjFyOU[=
Jurkat cells Ml73SpVv[3Srb36gZZN{[Xl? MoPuTY5pcWKrdHnvckBw\iCSQWLQNUBqdiCqdX3hckBLfXKtYYSgZ4VtdHNiYYPz[ZN{\WRiYYOgdoVlfWO2aX;uJI9nKGOnbHygeoli[mmuaYT5JIFnfGW{IEm2JIhzeyCkeTDNWHMh[XO|YYmgbY4heHKnc3XuZ4Uhd2ZiMUCwJJVOKG:oIITlcY97d2yxbXnk[UwhTUN3ME2wMlIh|ryP NVjxdlVuOjN6NUCxPVk>
BT20 cells M4KyWWN6fG:2b4jpZ4l1gSCjc4PhfS=> M{\hZ|UuPyCmYYnz MlH6R5l1d3SxeHnjbZR6KGGpYXnud5QhcHWvYX6gRnQzOCClZXzsd{Bie3Onc4Pl[EBieyCrbnjpZol1cW:wIH;mJINmdGxicILvcIln\XKjdHnvckBi\nSncjC1JJRwKDdiZHH5d{BjgSCFZXzsWIl1\XJvQnz1[UBie3OjeTygR2M2OD1{LkKg{txO NYHyfGVkOjV5NkGwPVY>
A2780 cells M4O4dGZ2dmO2aX;uJIF{e2G7 NXfRc|RrUW6qaXLpeIlwdiCxZjDQRXJRKGmwIHj1cYFvKEF{N{iwJINmdGy|IHHzd4V{e2WmIHHzJIlvcGmkaYTpc44hd2ZiaInkdo9o\W5icHXyc5hq\GVvaX7keYNm\CCSQWL5cIF1cW:wIHL5JINmdGxvYnHz[YQh[XO|YYm= MoTZNlU4PjFyOU[=

... Click to View More Cell Line Experimental Data

Methods Test Index PMID
Western blot
c-PARP /c-caspase 3 / γ-H2AX; 

PubMed: 29158830     

Western Blot data testing protein expression after treatment with Olaparib, Niraparib, and Talazoparib on Brca1-deficient cell line in W0069 cells.

Rad51 / Geminin; 

PubMed: 27614696     

Immunofluorescence microscopy of niraparib-treated PDX cells (PH039) and irradiated cells showing RAD51 foci (arrow) within geminin positive cells and lack of RAD51 foci formation in control cells. 

In vivo MK-4827, a novel, orally bioavailable, PARP-1 and PARP-2 inhibitor, strongly enhanced the effect of radiation on a variety of human tumor xenografts, both p53 wild type and p53 mutant[1]. It was well tolerated in vivo and demonstrated efficacy as a single agent in a xenograft model of BRCA-1 deficient cancer[2].


Cell Research:[2]
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  • Cell lines: HeLa BRCA1-silenced cells
  • Concentrations: serial dilutions
  • Incubation Time: 7 days
  • Method: Proliferation assays were conducted in 96-well black viewplates, and 300 cells/well (250 cell/well for BRCA-1 wt) in culture medium, 190 μL/well (DMEM containing 10% FCS, 0.1 mg/mL penicillin-streptomycin, and 2 mM L-glutamine), were plated and incubated for 4 h at 37℃ under 5% CO2 atmosphere. Inhibitors were then added with serial dilutions, 10 μL/well to obtain the desired final compound concentration in 0.5% DMSO. The cells were then incubated for 7 days at 37℃ in 5% CO2 after which time viability was assessed. Briefly, with CellTiter-Blue solution prediluted 1:10 in medium, 100 μL/well was added and the cells left for 45 min at 37℃ under 5% CO2 and then a further 15 min at room temperature in the dark. The number of living cells was determined by reading the plate at fluorimeter, excitation at 550 nm and emission at 590 nm. Cell growth was expressed as the percentage growth with respect to vehicle treated cells. The concentration required to inhibit cell growth by 50% (CC50) was determined.
    (Only for Reference)
Animal Research:[1]
- Collapse
  • Animal Models: Female nude mice
  • Formulation: 0.5% Methocel in deionized water
  • Dosages: 25 mg/kg twice daily or 50 mg/kg once daily
  • Administration: oral administration
    (Only for Reference)

Solubility (25°C)

In vitro DMSO 64 mg/mL (199.75 mM)
Ethanol 64 mg/mL (199.75 mM)
Water Insoluble
In vivo Add solvents to the product individually and in order(Data is from Selleck tests instead of citations):
10% DMSO+40% PEG 300+5% Tween 80+ddH2O
For best results, use promptly after mixing.

* Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations.

Chemical Information

Molecular Weight 320.39


CAS No. 1038915-60-4
Storage powder
in solvent
Smiles NC(=O)C1=CC=CC2=C[N](N=C12)C3=CC=C(C=C3)C4CCCNC4

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Clinical Trial Information

NCT Number Recruitment interventions Conditions Sponsor/Collaborators Start Date Phases
NCT03368729 Not yet recruiting Drug: Niraparib|Drug: Trastuzumab Metastatic Breast Cancer|HER2 Positive Breast Carcinoma University of Alabama at Birmingham|Translational Breast Cancer Research Consortium|Tesaro Inc.|Susan G. Komen Breast Cancer Foundation|Breast Cancer Research Foundation of Alabama|VFoundation November 2019 Phase 1|Phase 2
NCT03644342 Recruiting Drug: Nirapaib Metastatic Carcinoma of the Cervix Michelle S Ludwig|Tesaro Inc.|Baylor College of Medicine July 15 2019 Phase 1|Phase 2
NCT03891615 Not yet recruiting Drug: Niraparib|Drug: Osimertinib Lung Cancer Massachusetts General Hospital|Tesaro Inc. April 30 2019 Phase 1
NCT03752216 Recruiting Drug: Niraparib Ovarian Cancer ARCAGY/ GINECO GROUP|Tesaro Inc. April 3 2019 Phase 4

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Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID