Tazemetostat‐related Grade 3/4 TEAEs experienced in Part 2 were diarrhea (n = 1; 4.8%), alanine aminotransferase increased (n = 1; 4.8%), aspartate aminotransferase (n = 1; 4.8%), syncope (n = 1; 4.8%), acute kidney injury (n = 1; 4.8%), hypertension, and anemia (n = 2; 9.5%). Here, GPT is linked to hypertensive disorder.