1. Epigenetics
  2. Epigenetic Reader Domain
    Histone Methyltransferase

EPZ-6438 (Synonyms: Tazemetostat; E-7438)

Cat. No.: HY-13803 Purity: 99.63%
Data Sheet SDS Handling Instructions

EPZ-6438 inhibits the activity of human PRC2-containing wild-type EZH2 with Ki of 2.5±0.5 nM.

For research use only. We do not sell to patients.
EPZ-6438 Chemical Structure

EPZ-6438 Chemical Structure

CAS No. : 1403254-99-8

Size Price Stock Quantity
Free Sample (0.5-1 mg)   Apply now  
10 mM * 1 mL in DMSO $63 In-stock
5 mg $50 In-stock
10 mg $70 In-stock
50 mg $150 In-stock
100 mg $240 In-stock
200 mg $440 In-stock
500 mg   Get quote  
1 g   Get quote  

* Please select Quantity before adding items.

Customer Review

    EPZ-6438 purchased from MCE. Usage Cited in: Toxins (Basel). 2017 May 16;9(5). pii: E162.

    Cells are treated with LeTx in the presence or absence of GSK-J4 or EPZ-6438 for 48 h. H3K27me3 level is analyzed by Western blotting.
    • Biological Activity

    • Protocol

    • Technical Information

    • Purity & Documentation

    • References


    EPZ-6438 inhibits the activity of human PRC2-containing wild-type EZH2 with Ki of 2.5±0.5 nM.

    IC50 & Target

    Ki: 2.5 nM (EZH2)[1]

    In Vitro

    EPZ-6438 inhibits EZH2 in a manner competitive with the substrate S-adenosylmethionine (SAM). EPZ-6438 inhibits EZH1, EZH2(in peptide assay), EZH2 (in nucleosome assay) with IC50of 392 nM, 11 nM and 16 nM, respectively. EPZ-6438 displays a 35-fold selectivity versus EZH1 and >4,500-fold selectivity relative to 14 other HMTs tested[1].

    In Vivo

    EPZ-6438 (125 mg/kg) induces tumor stasis during the administration period and produced a significant tumor growth delay compared with vehicle after the dosing period. Measuring EPZ-6438 plasma levels either 5 min before or 3 h after dosing on day 21 reveals a clear dose-dependent increase in systemic exposure[1]. Dose-dependent target inhibition is observed in PBMCs and bone marrow from rats dosed with EPZ-6438 (orally administered, 100, 300, or 1,000 mg/kg) as measured by ELISA[2].

    Clinical Trial
    View MoreCollapse
    Preparing Stock Solutions
    Concentration Volume Mass 1 mg 5 mg 10 mg
    1 mM 1.7460 mL 8.7300 mL 17.4599 mL
    5 mM 0.3492 mL 1.7460 mL 3.4920 mL
    10 mM 0.1746 mL 0.8730 mL 1.7460 mL
    Please refer to the solubility information to select the appropriate solvent.
    Cell Assay

    EPZ-6438 is dissolved in DMSO and stored, and then diluted with appropriate media before use[1].

    293T (CRL-11268), RD (CRL-136), SJCRH30 (CRL-2061), A204 (HTB-82), G401 (CRL-1441), G402 (CRL-1440), KYM-1 (JCRB0627), 293T, RD, SJCRH30, A204, G401, and G402 cells are used. On day 0, cells are either untreated, DMSO-treated, or treated with EPZ-6438 starting at 10 µM and decreasing in either threefold or fourfold dilutions. Plates are read on day 0, day 4, and day 7 using Cell Titer Glo, with compound/media being replenished on day 4. On day 7, the six-well plates are trypsinized, centrifuged, and resuspended in fresh media for counting by Vi-Cell. Cells from each treatment are replated at the original density in 96-well plates in triplicate. Cells are allowed to adhere to the plate overnight, and cells are treated as on day 0. On days 7, 11, and 14, plates are read using Cell Titer Glo, with compound/media being replenished on day 11. Averages of triplicates are used to plot proliferation over the time course, and calculate IC50 values. For cell cycle and apoptosis, G401 and RD cells are plated in 15-cm dishes in duplicate at a density of 1×106 cells per plate. Cells are incubated with EPZ-6438 at 1 µM, in a total of 25 mL, over a course of 14 d, with cells being split back to original plating density on day 4, 7, and 11. Cell cycle analysis and TUNEL assay are performed using a Guava flow cytometer[1]. MCE has not independently confirmed the accuracy of these methods. They are for reference only.

    Animal Administration

    EPZ-6438 is prepared in 0.5% NaCMC plus 0.1% Tween 80 in water.

    SCID mice bearing s.c. G401 xenografts are inoculated s.c. at the right flank with G401 tumor cells (5×106 cells per mouse) in 0.2-mL mixture of base media and Matrigel for tumor development. The treatments are started when the tumor size reached 157 mm3 for the tumor efficacy study (n=16 mice per group). EPZ-6438 (125 mg/kg, 250 mg/kg, and 500 mg/kg) or vehicle (0.5% NaCMC plus 0.1% Tween 80 in water) is administered orally BID at a dose volume of 10 µL/g for either 21 or 28 d. Animal body weights are measured every day during the first week, and then twice weekly for the remainder of the study. Tumor size is measured twice weekly in two dimensions using a caliper, and the volume is expressed in cubic millimeters.
    Male and female Sprague-Dawley rats (8 weeks old) are orally treated with EPZ-6438 (100, 300, or 1,000 mg/kg) or vehicle for 28 days once a day. On day 22, the females from the highest dose group received another dose and are subsequently euthanized on day 23 approximately 29 hours after the last dose. All other animals are euthanized on day 29 approximately 29 hours after the last dose administered on day 28. At euthanasia, the full blood volume is collected, peripheral blood mononuclear cells (PBMC) are isolated, and cell pellets are frozen and stored at −80°C before analysis. A 2-mm-thick slice of skin is formalin-fixed for 24 hours and transferred to 70% ethanol. The fixed tissues are paraffin embedded. Bone marrow samples are collected from femur, tibia, and hip bones, frozen and stored at −80°C before analysis. MCE has not independently confirmed the accuracy of these methods. They are for reference only.

    Molecular Weight




    CAS No.


    Powder -20°C 3 years
      4°C 2 years
    In solvent -80°C 6 months
      -20°C 1 month

    Room temperature in continental US; may vary elsewhere

    Solvent & Solubility

    DMSO: 5.0 mg/mL (need ultrasonic)

    * "<1 mg/mL" means slightly soluble or insoluble. "≥" means soluble, but saturation unknown.

    Purity: 99.63%

    Inquiry Online

    Your information is safe with us. * Required Fields.

    Product name



    Applicant name *


    Email address *

    Phone number


    Organization name *

    Country *


    Requested quantity *


    Bulk Inquiry

    Inquiry Information

    Product Name:
    Cat. No.: