A previous study revealed that H3K4me3 is enriched in the PD‐L1 promoter in pancreatic tumour cells, and MLL1 directly binds to the PD‐L1 promoter and catalyses H3K4me3 to activate PD‐L1 transcription in tumour cells. The gene discussed is KMT2A; the disease is pancreatic neoplasm.