CDKN1A and breast cancer: Spatial transcriptomics analysis and chromatin immunoprecipitation-quantitative PCR (qPCR) were used to investigate the role of CDKN1A/p21 in the regulation and control of BCSC gene expression signatures.<h4>Results</h4>We demonstrated that alterations in CDKN1A/p21 expression affect the ability of breast cancer cells to grow and survive after oxidative damage.