Zinc‐finger MYND‐type‐containing 8 (ZMYND8) activates the transcription of CCAAT/enhancer‐binding protein epsilon by recognizing dimethylation of lysine 36 in histone H3 through its Pro‐Trp‐Trp‐Pro domain, thereby inhibiting adaptive unfolded protein response pathways to suppress the proliferation and invasion of multiple myeloma (MM) cells. This evidence concerns the gene ZMYND8 and plasma cell myeloma.