This study will provide continuing availability to tazemetostat for people that have previously completed participation in a tazemetostat study, either with monotherapy (single drug treatment) or combination therapy. The aim of the study will be to assess the long-term safety of tezemetostat.
This is a phase I, multi-center, open-label, multi-dose, two-part PK and safety study to characterize the DDI potential of oral Tazemetostat. Detailed Description: This two-part study is designed to characterize the steady-state PK of oral Tazemetostat and its metabolite EPZ 6930 when administered as a single and twice daily dose in subjects with advanced malignancies