EZH2 and gastrointestinal stromal tumor: Moreover, EZH2 protein expression was lower in GIST-T1 cells treated with sh-EZH2 + LLY-507 or sh-EZH2 + AZ-505 than in GIST-T1 cells treated with sh-NC + LLY-507 or sh-NC + AZ-505 (Figs. 2B, S2-B).