To investigate whether the expression of the tubulin genes is correlated with their promoter activity, we analyzed the enrichment of active promoter mark H3K4me3 on the tubulin promoter and flanking regions in the luminal A BC cell line MCF-7, the luminal B BC cell line ZR-75-30, the HER2-enriched BC cell line SKBR-3, and the basal-like BC cell line MDA-MB-231 cell lines by Cistrome Data Browser. The gene discussed is ERBB2; the disease is breast cancer.