EZ7438: This phase I/II trial is evaluating an oral drug (tazemetostat) alone and in combination with a steroid (prednisolone) for the treatment of advanced solid cancers and patients with B Cell LymphomaAn Open-Label, Multicenter, Phase 1/2 Study of E7438 (EZH2 Histone Methyl Transferase [HMT] Inhibitor) as a Single Agent in Subjects With Advanced Solid Tumors or With B-cell Lymphomas

Inclusion

1. Phase 1: Eastern Cooperative Oncology Group (ECOG) performance status of 0 to 1. Phase 2: ECOG performance status of 0 to 2.
2. Life expectancy of at least 3 months before starting tazemetostat.
3. Voluntary agreement to provide written informed consent and willing to adhere to all protocol requirements
4. Subjects with Hepatitis B or C are eligible on the condition that subjects have adequate liver function and are hepatitis B surface antigen negative and/or have undetectable hepatitis C virus (HCV) RNA.
5. Adequate renal and liver function
6. Phase 1: Males or females aged ≥ 16 years at time of informed consent. Phase 2: Males or females aged ≥ 18 years at the time of informed consent .
7. Females must not be lactating or pregnant at screening or baseline as documented by a negative pregnancy test All females will be considered to be of childbearing potential unless they are postmenopausal (at least 12 months consecutive amenorrheic, in the appropriate age group, and without other known or suspected cause) or have been sterilized surgically (ie, bilateral tubal ligation, total hysterectomy or bilateral oophorectomy, all with surgery at least 1 month before dose). Females of childbearing potential must not have had unprotected sexual intercourse within 30 days prior to study entry and must agree to use a highly effective method of contraception, from the last menstrual period prior to randomization, during Treatment Cycles, and for 6 months after the last final dose of study drug; any male partner must use a condom.
8. Male subjects must have had a successful vasectomy (with confirmed azoospermia) or they and their female partner must meet the criteria above (ie, not of childbearing potential or practicing highly effective contraception and use a condom throughout the study period and for 3 months after study drug discontinuation). Nonvasectomized male subjects must also agree to refrain from donating sperm from first dose of tazemetostat until 3 months following the last dose of tazemetostat
9. Phase 1 only: Histologically and/or cytologically confirmed advanced or metastatic solid tumor or B-cell lymphomas that have progressed after treatment with approved therapies or for which there are no standard therapies available.

10. Phase 2, Groups 1-6 only: Subjects must satisfy all of the following criteria:

    1. Have histologically confirmed DLBCL (including primary mediastinal B-cell lymphoma), with relapsed or refractory disease following at least 2 lines of prior standard therapy, including alkylator/anthracycline (unless anthracycline-based chemotherapy is contraindicated)/anti-CD20-based therapy (rituximab plus cyclophosphamide, doxorubicin, vincristine, and prednisone [R-CHOP] or equivalent) AND must be considered unable to benefit from intensification treatment with autologous hematopoietic stem cell transplantation (ASCT) as defined by meeting at least 1 of the following criteria:

       • Relapsed following, or refractory to, previous ASCT
       • Did not achieve at least a partial response to a standard salvage regimen (eg, rituximab, ifosfamide, carboplatin, and etoposide phosphate [R-ICE] or rituximab, dexamethasone, cytarabine, and cisplatin [R-DHAP])
       • Ineligible for intensification treatment due to age or significant comorbidity
       • Ineligible for intensification treatment due to failure to mobilize an acceptable number of hematopoietic stem cells
       • Refused intensification treatment and/or ASCT or
    2. Have histologically confirmed Follicular Lymphoma (FL), all grades. Subjects may have relapsed/refractory disease following at least 2 standard prior systemic treatment regimens where at least 1 anti-CD20-based regimen was used. Subjects with prior radiotherapy will be included; however, radiotherapy alone will not be considered a systemic treatment regimen.
    3. Have provided sufficient archival tumor tissue that has been successfully tested for EZH2 mutation status and cell of origin (DLBCL only)
    4. Have measurable disease as defined by International Working Group-Non-Hodgkin's Lymphoma (IWG-NHL)