Palbociclib (PD0332991) Isethionate

Licensed and Manufactured by Pfizer Catalog No.S1579

Palbociclib (PD0332991) Isethionate Chemical Structure

Molecular Weight(MW): 573.66

Palbociclib (PD0332991) Isethionate is a highly selective inhibitor of CDK4/6 with IC50 of 11 nM/16 nM in cell-free assays. It shows no activity against CDK1/2/5, EGFR, FGFR, PDGFR, InsR, etc. Phase 3.

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Cited by 13 Publications

9 Customer Reviews

  • (C) In vivo treatment of Tg:Pomc-Pttg;Pomc-eGFP embryos with small-molecule CDK inhibitors (50μM) or 0.2% DMSO as control from 18 to 40 hpf. One hundred to one hundred fifty embryos were treated with each compound. Representative images of live embryos are shown with gross morphology (Right) and pituitary Pomc-GFP–positive cells at higher magnification (Left) at 40 hpf. Embryos exposed to flavopiridol developed early developmental defect before pituitary POMC cell ontogeny occurs. (D) Relative expression of pituitary Pomc-eGFP fluorescence analyzed using Volocity 5.2 software (Improvision; mean ±SE of relative expression, n = 7). (E) R-roscovitine specifically suppresses expansion of pituitary POMC cells overexpressing zPttg from 18 to 48 hpf. Double transgenic Tg:Pomc-Pttg;Prl-RFP embryos were generated by breeding Tg:Pomc-Pttg fish with a previously generated PRL-RFP transgenic line, in which RFP was targeted to pituitary lactotrophs by a zebrafish Prolactin promoter (34). Representative fluorescent microscopy of pituitary POMC-eGFP (a and b) and PRL-RFP (c and d) expression in live Tg:Pomc-Pttg; Pomc-eGFP and Tg:Pomc-Pttg;Prl-RFP embryos treated with 0.2% DMSO (a and c) or 50 μM R-roscovitine (b and d). (F) Relative expression of pituitary POMC-eGFP or PRL-RFP fluorescence were analyzed (mean ±SE of relative expression; n = 10). Results represent one of three similar experiments;*P < 0.02 and **P < 0.000005. (Scale bar, 50 μm.)

    PNAS 2011 108(20), 8414-9. Palbociclib (PD0332991) Isethionate purchased from Selleck.

    Potentiation of SFN-induced cytotoxicity by a panel of CDK inhibitors in MDA-MB-231 cells. The fraction of cells killed (Fa ±SEM) by SFN in the presence of DMSO (vehicle) or a fixed concentration (0.2 uM) of PD0332991. The fraction of cells killed by CDK inhibitors at a fixed concentration of 0.2 uM is shown for comparison [dashed lines; gray shading (±SEM)]. MDE-CI analysis of drug interactions in the upper panels. CIs as a function of SFN concentration are shown. Black, gray, and white bars denote synergistic (CI < 0.9), additive (CI = 0.9-1.1), or antagonistic interactions (CI > 1.1), respectively. Synergistic ratios and SFN-EC50 are indicated. Data are representative of two to three independent experiments.

    Neoplasia 2013 15(8), 939-51. Palbociclib (PD0332991) Isethionate purchased from Selleck.

  • HT29 cells were treated with DMSO control, 1 uM selumetinib (Sel) or 5 uM PD0332991 (991) for 24 or 48 h after which time cells were lysed, subjected to SDS/PAGE and immunoblotted with the indicated antibodies.

    Biochem J 2014 459(3), 513-24. Palbociclib (PD0332991) Isethionate purchased from Selleck.


    Patient tumor cell sensitivity to combinatorial treatment with histone deacetylase (HDAC)/cyclin-dependent kinase (CDK) inhibitors in 3-D culture. The effect of each drug or drug combination was assessed by fluorescent dye to identify live (green) and dead cells (red). Cells from breast reduction patients were used as non-cancer control in the assay.

    Pharmacogenomics J 2013 13(1), 94-104. Palbociclib (PD0332991) Isethionate purchased from Selleck.

  • Immunoblot analysis of PD0332991-induced senescence in MEL10 cells. Cells were treated with indicated concentrations of PD0332991 with or without 10 nM rapamycin. After 1 day, cells were lysed and immunoblotting was performed with the indicated antibodies.

    Cell Cycle 2013 12(18), 3063-9. Palbociclib (PD0332991) Isethionate purchased from Selleck.

    Int J Mol Med, 2018, 41(5):2473-2484. Palbociclib (PD0332991) Isethionate purchased from Selleck.

  • Western blot analysis shows inhibition of Rb phosphorylation at the protein level, with inhibition of PD-0332991 observed at 2uM in the PDGF-B; Ink4a-ARF deficient line after only 24 hours of treatment.

    PLoS One 2013 8(10), e77639. Palbociclib (PD0332991) Isethionate purchased from Selleck.


    Cdk4 is upregulated in ARMS and mMSCs transfected with PAX7-FKHR fusion gene (MP7F), and can be specifi cally inhibited. D: IF results showing overexpression of cdk4 in MP7F cells compared to parental mMSCs and reduced expression of cdk4 after treatment of MP7F cells with the cdk4 inhibitor, PD-0332991. E: IF results showing MyoD1 expression in parental mMSCs cells, and MP7F cells untreated and after treatment with the cdk4 inhibitor, PD-0332991.

    Clin Transl Oncol 2012 14(3), 197-206 . Palbociclib (PD0332991) Isethionate purchased from Selleck.

  • Different breast cancer cell lines were seeded in 96 well plates and treated with different concentrations of PD0332991. After 72h, cell viability was assessed by MTT. Data shows that these cancer cell lines had a better response to CDK4/6 inhibition than the less tumorigenic MCF10A-Ras cells.

    Helen Sadik from Johhns Hopkins University. Palbociclib (PD0332991) Isethionate purchased from Selleck.

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Biological Activity

Description Palbociclib (PD0332991) Isethionate is a highly selective inhibitor of CDK4/6 with IC50 of 11 nM/16 nM in cell-free assays. It shows no activity against CDK1/2/5, EGFR, FGFR, PDGFR, InsR, etc. Phase 3.
Features The 1st specific inhibitor for CDK4/6 to show promise in multiple cancers.
CDK4/CyclinD3 [1]
(Cell-free assay)
CDK4/CyclinD1 [1]
(Cell-free assay)
CDK6/CyclinD2 [1]
(Cell-free assay)
9 nM 11 nM 15 nM
In vitro

PD 0332991 exhibits absolute selectivity for CDK4/6 with little or no activity against other CDKs. PD 0332991 is effective at reducing Rb phosphorylation at Ser780 and Ser795 in MDA-MB-435 breast carcinoma cells with IC50 of 66 nM and 63 nM, respectively. PD 0332991 is a potent inhibitor of cell growth and suppresses DNA replication by preventing cells from entering S phase. PD 0332991 inhibits thymidine incorporation into the DNA of Rb-positive human breast (such as MDA-MB-435, MCF-7), colon (H1299), and lung carcinomas (Colo-205) as well as human leukemias (CRRF-CEM and K562), with IC50 values ranging from 0.04-0.17 μM. PD 0332991 significant increases the percentage of MDA-MB-453 in G1 period. [1] PD 0332991 inhibits phosphorylation of Rb in cycling CD138+ primary bone marrow myeloma cells, nontransformed primary B cells, MM1.S and CAG HMCLs cells line with IC50 of <0.1 μM, 0.05 μM, and 60-70 nM, respectively. PD 0332991 treatment also induces G1 arrest of CD138+ primary bone marrow myeloma and nontransformed primary B cells. PD 0332991 induces G1 arrest in MM1.S with IC50 of ~0.05 μM. [2] PD 0332991 preferentially inhibits proliferation of luminal estrogen receptor-positive (including HER2-positive) human breast cancer cell lines. PD 0332991 increases gene expression of pRb and cyclin D1 and decreases gene expression of CDKN2A (p16) in most sensitive lines. PD 0332991 enhances sensitivity to tamoxifen in cell lines with conditioned resistance to ER blockade. [3]

Cell Data
Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID
H157 NFTldnhIem:5dHigTY5pcWKrdHnvckBCe3OjeR?= NWXSW4ZSOC1zMECg{txO MoWwO|IhcA>? M1zTSmlEPTB;OTFOwG0> MXuyOlM6ODN2Mh?=
H2170 NWfiSHlbT3Kxd4ToJGlvcGmkaYTpc44hSXO|YYm= NV\5XGNFOC1zMECg{txO MmLDO|IhcA>? MnPITWM2OD13IN88US=> MoPoNlY{QTB|NEK=
H596 M3[4fGdzd3e2aDDJcohq[mm2aX;uJGF{e2G7 M3Py[lAuOTByIN88US=> M3zqW|czKGh? NVO5OVhUUUN3ME2xNkDPxE1? NVGwNlJvOjZ|OUCzOFI>
IMR-32 NHe2Z41Iem:5dHigTY5pcWKrdHnvckBCe3OjeR?= M4XlNVQ5yqCq MnXoSG1UVw>? NWW0b3lsUUN3ME2yOlEhdk1? MnXnNlYzOjVzMkO=
SH-SY5Y M1nFRWdzd3e2aDDJcohq[mm2aX;uJGF{e2G7 MV60POKhcA>? M{XwbWROW09? MYTJR|UxRTZ5NjDuUS=> MViyOlIzPTF{Mx?=
NGP NWn4c4hQT3Kxd4ToJGlvcGmkaYTpc44hSXO|YYm= NXzWTVJkPDkEoHi= Mn3PSG1UVw>? NIqxeHpKSzVyPUKuNFc4KM7:TR?= MorNNlYzOjVzMkO=
SH-EP MkDQS5Jwf3SqIFnubIljcXSrb36gRZN{[Xl? NGmxSY41QMLiaB?= MXrEUXNQ Mo\1TWM2OD1{LkKxNUDPxE1? MVmyOlIzPTF{Mx?=
IMR-32 M2Xjfmdzd3e2aDDJcohq[mm2aX;uJGF{e2G7 MmKwNUDPxE1? MlG3NlQhcA>? NWHSR2FqTE2VTx?= M{jEZYlv\HWlZYOgS|Eh[XK{ZYP0 NIDHV5IzPjJ{NUGyNy=>
NGP NF;L[29Iem:5dHigTY5pcWKrdHnvckBCe3OjeR?= M1;ZS|Eh|ryP M17SeVI1KGh? NILZPY1FVVOR NIjxWldqdmS3Y3XzJGcyKGG{cnXzeC=> NF3iRlIzPjJ{NUGyNy=>
NGP MoDuSpVkfGmxbjDBd5NigQ>? NGHVU3YxNTFizszN NF7pPHYzPCCq MnuzSG1UVw>? MmjsdoVlfWOnczD0bIUh\XiycnXzd4lwdiCxZtMgWG9ROkFuwrDDR25GOixiYX7kxsBVUzIEoHnuJIEh\G:|ZT3k[ZBmdmSnboSgcYFvdmW{ NVfNenFMOjZ{MkWxNlM>
IMR-32 NYrv[Xp4TnWldHnvckBCe3OjeR?= Mn2wNE0yKM7:TR?= MVSyOEBp NXLFWXpYTE2VTx?= NWTLRVlvemWmdXPld{B1cGViZYjwdoV{e2mxbjDv[uKhXE:SMlGsxsBES06HMjygZY5lyqCWS{JCpIlvKGFiZH;z[U1l\XCnbnTlcpQhdWGwbnXy NH33bWMzPjJ{NUGyNy=>
U-CH2 M4K1TWdzd3e2aDDJcohq[mm2aX;uJGF{e2G7 NVzk[XkxOC1zIN88US=> NHHkOYo4OiCq Mn\jTWM2OD13MD6yJI5O MXWyOlE5Ozl{NR?=
U-CH3 M4jnWmdzd3e2aDDJcohq[mm2aX;uJGF{e2G7 NWjjfWtKOC1zIN88US=> Mnf4O|IhcA>? Mkn1TWM2OD13MjDuUS=> NE\PPXEzPjF6M{myOS=>
U-CH6 M3\QPWdzd3e2aDDJcohq[mm2aX;uJGF{e2G7 NXXSfJgxOC1zIN88US=> NEjBeJo4OiCq NIrxb2VKSzVyPUmwJI5O NGLaXI4zPjF6M{myOS=>
U-CH7 MWHHdo94fGhiSX7obYJqfGmxbjDBd5NigQ>? NVvTcm1kOC1zIN88US=> MnyyO|IhcA>? MmC2TWM2OD17ODDuUS=> Mk\QNlYyQDN7MkW=
U-CH11 M{LDemdzd3e2aDDJcohq[mm2aX;uJGF{e2G7 M3m5ZlAuOSEQvF2= Mn6zO|IhcA>? Mk\MTWM2OD1|NECgcm0> NVXteFA2OjZzOEO5NlU>
MCF7 NVTBPZlJTnWldHnvckBCe3OjeR?= M2rJfFIvPS1{NUCgcm0> NVLjT3Y4OjRiaB?= M4PrcJJm\HWlZYOgVoIheGixc4Doc5J6dGG2aX;u MYOyOVk6OThzNx?=
MV4-11 NVu2OZN6SXCxcITvd4l{KEG|c3H5 M{fNUFAvPSEQvF2= NHHCOVgzPCCq M33ITYVvcGGwY3XzJIFxd3C2b4Ppd{BqdmS3Y3XkJIJ6KHOxcnHm[Y5q[iCjbnSgRWMzOjB? Mo\SNlU1QDd7MUe=
MOLM13 NWe3XJU2SXCxcITvd4l{KEG|c3H5 MUWwMlUh|ryP NI\kWmczPCCq NGm0cIVmdmijbnPld{BieG:ydH;zbZMhcW6mdXPl[EBjgSC|b4Lh[oVvcWJiYX7kJGFEOjJy M4D0XVI2PDh5OUG3
MOLM13-ITD alone NGnxOYpIem:5dHigTY5pcWKrdHnvckBCe3OjeR?= Mn3nTWM2OD1yLkC4PUDDuSByLkCwPUDPxE1? MmOyNlU1QDd7MUe=
MV4-11-ITD alone Ml3SS5Jwf3SqIFnubIljcXSrb36gRZN{[Xl? NWLMepB6UUN3ME2wMlA6OiEEsTCwMlAxQCEQvF2= NEPtW3czPTR6N{mxOy=>
MOLM13-ITD/D835Y NFfwfZNIem:5dHigTY5pcWKrdHnvckBCe3OjeR?= Mn\sTWM2OD1yLkGxOEDDuSByLkCxNUDPxE1? MoHiNlU1QDd7MUe=
MV4-11-ITD/D835V M3i1WWdzd3e2aDDJcohq[mm2aX;uJGF{e2G7 MnnwTWM2OD1yLkGxOkDDuSByLkCxNUDPxE1? NHH5Oo0zPTR6N{mxOy=>
MV4-11-ITD/D835V NYPBWHF7T3Kxd4ToJGlvcGmkaYTpc44hSXO|YYm= M{fKc2lEPTB;MD6xNFIhyrFiMD6wNFYh|ryP Mm\aNlU1QDd7MUe=
MV4-11-ITD/F691L NF3ub|dIem:5dHigTY5pcWKrdHnvckBCe3OjeR?= NFTxZpZKSzVyPUCuNVEzKMLzIECuNFE2KM7:TR?= MXOyOVQ5PzlzNx?=
MV4-11-ITD/N841K NGX5RVVIem:5dHigTY5pcWKrdHnvckBCe3OjeR?= NVTlZ3dWUUN3ME2wMlEyOyEEsTCwMlAxOiEQvF2= NHXiepQzPTR6N{mxOy=>

... Click to View More Cell Line Experimental Data

In vivo PD 0332991(150 mg/kg) produces rapid Colo-205 colon carcinoma xenografts regressions and a corresponding tumor growth delay. PD 0332991 (150 mg/kg) induces complete tumor stasis and cell kill in MDA-MB-435 breast carcinoma. PD 0332991 (150 mg/kg) also induces significant tumor regression in mice bearing the SF-295 glioblastoma xenografts, and in ZR-75-1 breast and PC-3 prostate tumor models (complete suppression of tumor growth). PD 0332991 (150 mg/kg) suppresses Rb Ser780 phosphorylation in MDA-MB-435 breast carcinoma over the full 24-hour period. PD 0332991 (150 mg/kg) down-regulates expression of four E2F-regulated genes CDC2, CCNE2, TK1, and TOP2A in Colo-205 carcinoma xenografts. [1] PD 0332991 also rapidly inhibits myeloma tumor growth. [2]


Kinase Assay:[4]
+ Expand

CDK activity assays:

CDK assays for IC50 determinations and kinetic evaluation are performed in 96-well filter plates. All CDK-cyclin kinase complexes are expressed in insect cells through baculovirus infection and purified. The substrate for the assays is a fragment (amino acids 792–928) of pRb fused to GST (GST•RB-Cterm). The total reaction volume is 0.1 mL containing a final concentration of 20 mM Tris-HCl, pH 7.4, 50 mM NaCl, 1 mM dithiothreitol, 10 mM MgCl2 25 μM ATP (for CDK4-cyclin D1, CDK6-cyclin D2, and CDK6-cyclin D3) containing 0.25 μCi of [γ-32P]ATP, 20 ng of enzyme, 1 μg of GST•RB-Cterm, and appropriate dilutions of inhibitor. All components except the [γ-32P]ATP are added to the wells, and placed on a plate mixer for 2 min. The reaction is started by adding the [γ-32P]ATP, and incubated at 25℃ for 15 min. The reaction is terminated by addition of 0.1 mL of 20% trichloroacetic acid, and the plate is kept at 4 ℃ for at least 1 hr to allow the substrate to precipitate. The wells are then washed five times with 0.2 mL of 10% trichloroacetic acid, and radioactive incorporation is determined with a β plate counter.
Cell Research:[3]
+ Expand
  • Cell lines: Human breast cancer cells MDA-MB-435
  • Concentrations: 2 μM
  • Incubation Time: 6 days
  • Method: Cells are seeded in duplicate at 5,000 to 10,000 cells per well in 24-well plates. The day after plating, different concentrations of PD 0332991 are added. Control wells without drug are also seeded. At the end of incubation, cells are trypsinizated and placed in Isotone solution and counted immediately using a Coulter Z2 particle counter.
    (Only for Reference)
Animal Research:[1]
+ Expand
  • Animal Models: Human colon carcinoma xenografts Colo-205
  • Formulation: Solution in sodium lactate buffer (50 mM, pH 4.0)
  • Dosages: 150 mg/kg
  • Administration: o.p. injection every day
    (Only for Reference)

Solubility (25°C)

In vitro Water 10 mg/mL warmed (17.43 mM)
DMSO Insoluble
Ethanol Insoluble
In vivo Add solvents to the product individually and in order(Data is from Selleck tests instead of citations):
saline (with warming)
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 573.66


CAS No. 827022-33-3
Storage powder
in solvent
Synonyms N/A

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Clinical Trial Information

NCT Number Recruitment Conditions Sponsor/Collaborators Start Date Phases
NCT03609047 Not yet recruiting Breast Cancer Stage II|Breast Cancer Stage III European Organisation for Research and Treatment of Cancer - EORTC|Pfizer May 7 2019 Phase 2
NCT03609047 Not yet recruiting Breast Cancer Stage II|Breast Cancer Stage III European Organisation for Research and Treatment of Cancer - EORTC|Pfizer May 7 2019 Phase 2
NCT03820830 Not yet recruiting Breast Cancer Recurrent International Breast Cancer Study Group|Pfizer May 1 2019 Phase 3
NCT03870919 Not yet recruiting Breast Cancer Stage IV|Radiotherapy|Surgery UNICANCER|Pfizer May 15 2019 Not Applicable
NCT03820830 Not yet recruiting Breast Cancer Recurrent International Breast Cancer Study Group|Pfizer May 1 2019 Phase 3
NCT03870919 Not yet recruiting Breast Cancer Stage IV|Radiotherapy|Surgery UNICANCER|Pfizer May 15 2019 Not Applicable

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Answers to questions you may have can be found in the inhibitor handling instructions. Topics include how to prepare stock solutions, how to store inhibitors, and issues that need special attention for cell-based assays and animal experiments.

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Frequently Asked Questions

  • Question 1:

    What is the best vehicle for palbociclib for in vitro and in vivo?

  • Answer:

    You can use water for vitro use and Saline for vivo use.

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Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID