A Study of Tazemetostat in Adult Participants With Soft Tissue Sarcoma

Synovial Sarcoma Clinical Trial

Official title: A Phase II, Multicenter Study of the EZH2 Inhibitor Tazemetostat in Adult Subjects With INI1-Negative Tumors or Relapsed/Refractory Synovial Sarcoma

Status Completed

Clinical Trial Summary

This study will include participants with various types of cancer known as soft-tissue sarcomas.

Tissues that can be affected by soft tissue sarcomas include fat, muscle, blood vessels, deep skin tissues, tendons and ligaments.

Soft tissue cancers are rare and can occur almost anywhere in the body.

Part 1 of this trial will study the safety and the level that adverse effects of the study drug tazemetostat in combination with doxorubicin (current front line treatment) can be tolerated (known as tolerability).

It is also designed to establish a recommended study drug dosage for the next part of the study.

Part 2 will evaluate and compare how long participants live without their disease getting worse when receiving the study drug plus doxorubicin versus doxorubicin plus placebo (dummy treatment).

Clinical Trial Description

This is a Phase II, multicenter, open-label, single arm, 2-stage study of tazemetostat 800 mg BID (twice daily) and 1600 mg QD (once daily). Subjects will be screened for eligibility within 21 days of the planned date of the first dose of tazemetostat and enrolled into one of 8 cohorts:

Cohort using tazemetostat 800 mg BID

• Cohort 1 (Closed for enrollment): malignant rhabdoid tumor (MRT), rhabdoid tumor of the kidney (RTK), atypical teratoid rhabdoid tumor (ATRT), and selected tumors with rhabdoid features, including small cell carcinoma of the ovary hypercalcemic type (SCCOHT), also known as malignant rhaboid tumor of the ovary (MRTO)

• Cohort 2 (Closed for enrollment): Relapsed or refractory synovial sarcoma with SS18-SSX rearrangement

• Cohort 3 (Closed for enrollment): Other integrase interactor 1 (INI1) negative tumors or any solid tumor with an enhancer of zeste homologue-2 (EZH2) gain of function (GOF) mutation, including: epithelioid malignant peripheral nerve sheath tumor (EMPNST), extraskeletal myxoid chondrosarcoma (EMC), myoepithelial carcinoma, other INI1-negative malignant tumors with Sponsor approval (e.g., dedifferentiated chordoma) any solid tumor with an EZH2 GOF mutation including but not limited to Ewing's sarcoma and melanoma

• Cohort 4 (Closed for enrollment): Renal medullary carcinoma (RMC)

• Cohort 5 (Closed for enrollment): Epithelioid sarcoma (ES)

• Cohort 6 (Closed for enrollment): Epithelioid sarcoma (ES) undergoing mandatory tumor biopsy

• Cohort 7 (Closed for enrollment): Poorly differentiated chordoma (or other chordoma with Sponsor approval)

Cohort using tazemetostat 1600 mg QD

• Cohort 8 (Closed for enrollment): Epitheliod sarcoma

Participants will be dosed in continuous 28-day cycles. (Note: if treatment with study drug is discontinued prior to completing 2 years, subjects will be followed for a maximum duration of 2 years from start of study drug dosing.) Response assessment will be performed every 8 weeks while on study.

Treatment with tazemetostat will continue until disease progression, unacceptable toxicity or withdrawal of consent, or termination of the study. ;

Related Conditions & MeSH terms

• Any Solid Tumor With an EZH2 GOF Mutation
• Atypical Teratoid Rhabdoid Tumors (ATRT)
• Chordoma
• Epithelioid Sarcoma
• INI1-negative Tumors
• Kidney Neoplasms
• Malignant Rhabdoid Tumor of Ovary
• Malignant Rhabdoid Tumors (MRT)
• Neoplasms
• Poorly Differentiated Chordoma (or Other Chordoma With Sponsor Approval)
• Renal Medullary Carcinoma
• Rhabdoid Tumor
• Rhabdoid Tumors of the Kidney (RTK)
• Sarcoma
• Sarcoma, Synovial
• Selected Tumors With Rhabdoid Features
• Synovial Sarcoma

• NCT number: NCT02601950
• Study type: Interventional
• Source: Ipsen
• Status: Completed
• Phase: Phase 2
• Start date: December 22, 2015
• Completion date: February 26, 2024