A Study on the Effect of Tazemetostat (study drug) in Pediatric Subjects with relapsed or refractory Tumors or Synovial Sarcoma

Phase 1

• Conditions: Atypical teratoid rhabdoid tumor (ATRT), Malignant rhabdoid tumor (MRT), Rhabdoid tumor of kidney (RTK). Outside of Germany : - selected tumors with rhabdoid features; - INI-negative tumors or synovial sarcoma: Epithelioid sarcoma, Epithelioid malignant peripheral nerve sheath tumor, Extraskeletal myxoid chondrosarcoma, Myoepithelial carcinoma, Renal medullary carcinoma, other INI1-negative malignant tumors (like dedifferentiated chordoma), Synovial Sarcoma with a SS18-SSX rearrangement.; MedDRA version: 21.1Level: LLTClassification code 10064886Term: Renal medullary carcinomaSystem Organ Class: 10029104 - Neoplasms benign, malignant and unspecified (incl cysts and polyps); MedDRA version: 21.0Level: LLTClassification code 10065870Term: Atypical teratoid/rhabdoid tumor of CNSSystem Organ Class: 10029104 - Neoplasms benign, malignant and unspecified (incl cysts and polyps); MedDRA version: 21.0Level: PTClassification code 10073134Term: Extraskeletal myxoid chondrosarcomaSystem Organ Class: 10029104 - Neoplasms benign, malignant and unspecified (incl cysts and polyps); MedDRA version: 21.1Level: LLTClassification code 10073335Term: Rhabdoid tumorSystem Organ Class: 10029104 - Neoplasms benign, malignant and unspecified (incl cysts and polyps); MedDRA version: 20.0Level: LLTClassification code 10074121Term: Rhabdoid tumor of the kidneySystem Organ Class: 10029104 - Neoplasms benign, malignant and unspecified (incl cysts and polyps); MedDRA version: 20.0Level: PTClassification code 10042863Term: Synovial sarcomaSystem Organ Class: 10029104 - Neoplasms benign, malignant and unspecified (incl cysts and polyps); MedDRA version: 20.0Level: HLTClassification code 10015100Term: Epithelioid sarcomasSystem Organ Class: 10029104 - Neoplasms benign, malignant and unspecified (incl cysts and polyps); Therapeutic area: Diseases [C] - Cancer [C04]

• Registration Number: EUCTR2015-002468-18-DE
• Lead Sponsor: Epizyme, Inc.

Brief Summary

Not available

Detailed Description

Not available

Study Timeline

• Results First Posted: 1900-01-01
• Study Start: 2015-12-15
• Last Update Posted: 7 September 2021

Recruitment & Eligibility

• Status: ot Recruiting
• Sex: All
• Target Recruitment: 120

Inclusion Criteria

1.Age (at the time of consent/assent): =6 months to <18 years of age Cohort 4 only: =10 y to <18 y
2.Performance Status:If <12 y: Lansky Performance Status >50% ,If = 12 y of age: Karnofsky Performance Status >50%
3.Has provided signed written ICF 4. Has a life expectancy of >3 months. 5.Has relapsed or refractory disease and no standard treatment
options. 6.Is ineligible for other treatment regimens. 7.Has a documented local diagnostic pathology of original biopsy. 8.Has all prior treatment related
clinically significant toxicities resolve to = Grade 1 per CTCAE, version 4.03 or are clinically stable& not clinically significant. 9.Prior therapies
must be completed according to the protocol. 10.Has adequate hemat. BM & coagulation factors, renal&hepatic function as defined by criteria in
the protocol 11.Specific requirements for subjects with CNS involvement eg: stable deficits within certain timeframe, stable seizure, treated brain
metastases without evidence of progression. 12.Has a LV fractional shortening of >27% or an LV ejection fraction of =50% by ECHO or
MUGA scan & NYHAC =2. 13. Has a QT interval corrected by Fridericia's formula (QTcF) =450 msec. 14.Is able to swallow and retain orally administered medication and does not have any uncontrolled GI condition that may alter absorption. 15.Has sufficient tumor tissue for central confirmatory
testing of IHC and/or cytogenetics/FISH and/or DNA mutation analysis. 16.Is willing and able to comply with all aspects of the protocol. 17.18.
For female subjects of childbearing potential and for male subjects with a female partner of childbearing potential Subject must adhere to
contraception methods described in the protocol. For Dose Escalation Only:ALL criteria above and the following:1.Has evaluable disease as defined as lesions that can be accurately measured at least in one dimension by radiographic examination or physical examination or and other lesions such as bone lesions, leptomeningeal disease, ascites, pleural/pericardial effusions, lymphangitis cutis/pulmonitis or hepatosplenomegaly from disease2.Has one of the
following histologically confirmed tumors: Rhabdoid tumor: ATRT (closed to enrollment), MRT, RTK, selected tumors with rhabdoid features, INI1-
negative tumor: (Epithelioid sarcoma, Epithelioid malignant peripheral nerve sheath tumor, EMC, Myoepithelial carcinoma, Renal medullary
carcinoma), other INI1-negative malignant tumors, Synovial sarcoma with SS18-SSX rearrangement (closed to enrollment).
3. For subjects with ATRT, MRT, and RTK or tumors with rhabdoid features only: the following test results must be available:
•Morphology and immunophenotypic panel consistent with rhabdoid tumor, and •Loss of INI1 or SMARCA 4 confirmed by IHC, or
•Molecular confirmation of tumor bi-allelic INI1 or SMARCA 4 loss or mutation when INI1 or SMARCA4 IHC is equivocal or unavailable
4. For subjects with INI1 negative tumor only the following test results must be available:
•Morphology and immunophenotypic panel consistent with INI1 negative tumors, and
•Loss of INI1 confirmed by IHC, or
•Molecular confirmation of tumor bi-allelic INI1 loss or mutation when INI1 IHC is equivocal or unavailable 5.For subjects with synovial sarcoma with SS18-SSX rearangement only the following test results must be available:
•Morphology consistent with synovial sarcoma, and
•Cytogenetics or FISH and/or molecular confirmation (e.g.DNA sequencing) of SS18 rearrangement t(X;18)(p11;q1

Exclusion Criteria

1.Has had prior exposure to tazemetostat or other inhibitor(s) of enhancer of zeste homolog2 (EZH2)
2.Is being actively treated for another concurrent malignancy or is less than five years from completion of treatment for another malignancy
3.Has participated in another interventional clinical study and received investigational drug within 30 days or five half-lives, whichever is longer, prior to the planned first dose of tazemetostat
4.Has had major surgery within 2 weeks prior to enrollment
5.Has thrombocytopenia, neutropenia, or anemia of Grade =3 (per CTCAE 4.03 criteria) or any prior history of myeloid malignancies,
including myelodysplastic syndrome (MDS). Has abnormalities known to be associated with MDS (e.g del 5q, chr 7 abn) and MPN (e.g. JAK2 V617F) observed in cytogenetic testing and DNA sequencing.
Note: Bone marrow aspirate/biopsy will be conducted following abnormal peripheral blood smear morphology assessment at Screening.
Cytogenetic testing and DNA sequencing will be conducted by a central laboratory following an abnormal result of bone marrow aspirate/biopsy.
6.Has a prior history of T-cell lymphoblastic lymphoma/T-cell acute
lymphoblastic lymphoma (T-LBL/T-ALL).
7.Has clinically active heart disease including prolonged QTcF (>450 msec)
8.Is currently taking any prohibited medication(s) as described in section 7.3
9.Is unwilling to exclude grapefruit juice, Seville oranges and grapefruit from the diet and all foods that contain those fruits from time of enrollment to while on study
10.Has an active infection requiring systemic treatment
11.Is immunocompromised (ie congenital immunodeficiency), including subjects with a known history of infection with human immunodeficiency virus (HIV)
12.Has known history of chronic infection with hepatitis B virus (hepatitis B surface antigen positive) or hepatitis C virus (detectable HCV RNA)
13.Has had a symptomatic venous thrombosis within 14 days prior to study enrollment
14.For subjects with CNS involvement (primary tumor or metastatic disease): Have any active bleeding, or new intratumoral hemorrhage of more than punctate size on Screening MRI obtained within 14 days of starting study drug,or known bleeding diathesis or treatment with anti-platelet or anti-thrombotic agents
15.Has known hypersensitivity to any of the components of tazemetostat or other inhibitor(s) of EZH2, or hypersensitivity to Ora-sweet or methylparaben
16.Has an uncontrolled intercurrent illness including, but not limited to, uncontrolled infection, or psychiatric illness/social situations that would limit compliance with study requirements
17.For female subjects of childbearing potential: Is pregnant or nursing
For male subjects: Is unwilling to adhere to contraception criteria from time of enrollment in study to at least 3 months after last dose of tazemetostat.

Study & Design

• Study Type: Interventional clinical trial of medicinal product
• Study Design: Not specified