DSN1 and breast cancer: Drug sensitivity analysis showed that the DSN1 high expression group was resistant to drugs such as Epirubicin, Cyclophosphamide, Ribociclib, and Palbociclib, but relatively sensitive to tamoxifen and lapatinib.<h4>Conclusions</h4>DSN1 contributes to breast cancer progression by modulating cell cycle pathways, making it a potential diagnostic and therapeutic target with clinical applicability.