ARID1A and neoplasm: Genetic mutation of the chromatin remodelling complex has been identified as a mechanism of tumour occurrence and development.10 Here, we analyse the transcriptional profiling of paclitaxel‐sensitive DU4475 and paclitaxel‐resistant MDA‐MB436 without or with paclitaxel treatment, which was determined previously.11 We found that the AT‐rich interaction domain 1A (ARID1A) is up‐regulated in DU4475 cells but is down‐regulated in MDA‐MB436 cells.