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Tazemetostat in Combination With Doxorubicin as Frontline Therapy for Advanced Epithelioid Sarcoma

Trial Status: Active

This is a multicenter, double-blind, placebo-controlled, randomized phase 3 study with phase 1b portion designed to establish a recommended phase 3 dose (RP3D) and to evaluate the efficacy, PK, and safety of tazemetostat + doxorubicin vs placebo + doxorubicin in subjects with advanced epithelioid sarcoma (ES). This study will be conducted in 2 parts.

Inclusion Criteria

  • Inclusion Criteria Subjects must meet ALL the following inclusion criteria to be eligible to enroll in this study: 1. Have voluntarily agreed to provide written informed consent and demonstrated willingness and ability to comply with all aspects of the protocol. 2. Phase 1b: 18-35 years old histologically confirmed STS 3. Phase 3: >18 years old with Epithelioid Sarcoma 4. Have measurable disease 5. Females must not be lactating or pregnant at Screening or Baseline (as documented by a negative pregnancy test) 6. Because of unknown impact on a developing fetus, females must not be pregnant or breast feeding and agree to use highly effective contraception during the clinical trial and for 6 months following the final dose of study 7. Male subjects of child-bearing potential must have had either a successful vasectomy or practice highly effective contraception and use a condom throughout the study period and for 3 months after doxorubicin or tazmetostat discontinuation. 8. Subjects diagnosed with human immunodeficiency virus (HIV) are eligible to participate in the study if their infection is well controlled on anti-retroviral therapy. Exclusion Criteria Subjects meeting ANY of the following exclusion criteria are NOT eligible to enroll in this study: 1. Prior exposure to tazemetostat or other inhibitor(s) of enhancer of zeste homologue-2 (EZH2). 2. Prior systemic anticancer therapy. 3. Have any prior history of myeloid malignancies, including myelodysplastic syndrome (MDS) or acute myeloid leukemia (AML). 4. Have prior history of T-cell lymphoblastic lymphoma/T-cell acute lymphoblastic leukemia (T- LBL/T-ALL). 5. Have participated in another interventional clinical study and received investigational drug within 30 days or 5 half-lives, whichever is longer, prior to the planned first dose of study treatment. 6. Have known active central nervous system (CNS) or any leptomeningeal metastasis of primary extracranial tumor. 7. Subjects taking medications that are known potent cytochrome P450 (CYP)3A4 inducers/inhibitors (including St. John's Wort) 8. Are unwilling to exclude Seville oranges, grapefruit juice, AND grapefruit from the diet and all foods that contain those fruits from time of enrollment to while on study. 9. Major surgery within 4 weeks before the first dose of study treatment. Subjects must have recovered from surgery prior to enrollment to this study. 10. Are unable to take oral medication OR have malabsorption syndrome or any other uncontrolled gastrointestinal condition (eg, nausea, diarrhea, vomiting) that might impair the bioavailability of study treatment. 11. Venous thrombosis or pulmonary embolism within the last 1 month before starting study treatment. 12. Have an active infection requiring systemic therapy. 13. Are immunocompromised (ie, has a congenital immunodeficiency). 14. Have known hypersensitivity to any component of tazemetostat or doxorubicin. 15. Have a known active infection with hepatitis B virus (HBV, as measured by positive hepatitis B surface antigen), hepatitis C virus (HCV, as measured by positive hepatitis C antibody). 16. Any other major illness that, in the Investigator's judgment, will substantially increase the risk associated with the subject's participation in this study OR interfere with their ability to receive study treatment or complete the study. 17. Subjects who have undergone a solid organ transplant.


City of Hope Comprehensive Cancer Center
Status: ACTIVE


University of Colorado Hospital


Mayo Clinic in Florida
Status: ACTIVE


Brigham and Women's Hospital
Dana-Farber Cancer Institute
Massachusetts General Hospital Cancer Center
Status: ACTIVE


Ann Arbor
University of Michigan Comprehensive Cancer Center
Status: ACTIVE


Saint Louis
Siteman Cancer Center at Washington University
Status: ACTIVE

New York

New York
NYP / Columbia University Medical Center / Herbert Irving Comprehensive Cancer Center
Status: ACTIVE


Ohio State University Comprehensive Cancer Center
Status: ACTIVE


OHSU Knight Cancer Institute
Status: ACTIVE


Thomas Jefferson University Hospital
Status: ACTIVE
University of Pittsburgh Cancer Institute (UPCI)
Status: ACTIVE


Fred Hutch / University of Washington Cancer Consortium
Status: ACTIVE

The open-label phase 1b portion is designed to evaluate the safety of the combination of

tazemetostat + doxorubicin, as well as to establish the maximum tolerated dose (MTD) and the

RP3D. The phase 3 portion of the clinical trial aims to compare tazemetostat + doxorubicin to

the current front-line standard treatment, single-agent doxorubicin + placebo, when used as

first-line treatment in locally advanced unresectable or metastatic ES.

Trial Phase Phase III

Trial Type Treatment

Lead Organization
Epizyme, Inc.

  • Primary ID EZH-301
  • Secondary IDs NCI-2020-00071
  • ID NCT04204941