This is a Phase I, open-label, dose escalation and dose expansion study with a BID oral dose of tazemetostat. Subjects will be screened for eligibility within 14 days of the planned first dose of tazemetostat. A treatment cycle will be 28 days. Response assessment will be evaluated after 8 weeks of treatment and subsequently every 8 weeks while on study. The study has two parts: Dose Escalation and Dose Expansion. Dose escalation for subjects with the following relapsed/refractory malignancies: - Rhabdoid tumors: - Atypical teratoid rhabdoid tumor (ATRT) - Malignant rhabdoid tumor (MRT) - Rhabdoid tumor of kidney (RTK) - Selected tumors with rhabdoid features - INI1-negative tumors: - Epithelioid sarcoma - Epithelioid malignant peripheral nerve sheath tumor - Extraskeletal myxoid chondrosarcoma - Myoepithelial carcinoma - Renal medullary carcinoma - Other INI1-negative malignant tumors (e.g., dedifferentiated chordoma) (with Sponsor approval) - Synovial Sarcoma with a SS18-SSX rearrangement Dose Expansion at the MTD or the RP2D - Cohort 1 -(closed to enrollment) ATRT - Cohort 2 - MRT/RTK/selected tumors with rhabdoid features - Cohort 3 - INI-negative tumors: - Epithelioid sarcoma - Epithelioid malignant peripheral nerve sheath tumor - Extraskeletal myxoid chondrosarcoma - Myoepithelial carcinoma - Renal medullary carcinoma - Chordoma (poorly differentiated or de-differentiated) - Other INI1-negative malignant tumors (e.g., dedifferentiated chordoma) with Sponsor approval - Cohort 4 -(closed to enrollment) Tumor types eligible for Cohorts 1 through 3 or synovial sarcoma with SS18-SSX rearrangement
Name: Tazemetostat
Description: Tazemetostat (EPZ-6438) is a selective small molecule inhibitor of the histone-lysine methyltransferase EZH2 gene.Type: DrugOpen-label Tazemetostat
Description: The incidence and severity of treatment-emergent adverse events (AEs) qualifying as protocol-defined DLTs in Cycle 1 will guide establishment of the protocol defined RP2D and/or MTD
Measure: To determine the MTD or the RP2D (Dose Escalation) Time: 1 cycle/28 daysSingle Group Assignment
There is one SNP
JAK2 V617F) observed in cytogenetic testing and DNA sequencing. --- V617F ---