To understand the expression of KDM6B in breast cancer, we explored The Cancer Genome Atlas (TCGA; https://www.cancer.gov/about‐nci/organization/ccg/research/structural‐genomics/tcga), a free database that includes the genomic, epigenomic, transcriptomic and proteomic data of 33 types of cancers and matched normal samples, to determine whether abnormal KDM6B expression was present. The gene discussed is KDM6B; the disease is breast carcinoma.