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CDK4/6 inhibitors are being used to treat a variety of human malignancies. In well-differentiated and dedifferentiated liposarcoma their clinical promise is associated with their ability to downregulate the MDM2 protein. The downregulation of MDM2 following treatment with CDK4/6 inhibitors also induces many cultured tumor cell lines derived from different types of malignancies to progress from quiescence into senescence. Here we used cultured human cell lines and defined a role for PDLIM7 and CDH18, regulating MDM2 protein in CDK4/6 inhibitor-treated cells. Materials from our previous phase II trials with palbociclib were then used to demonstrate that expression of CDH18 protein was associated with response, measured as both progression-free survival and overall survival. This supports the hypothesis that the biologic transition from quiescence to senescence has clinical relevance for this class of drugs.

PDLIM7 and CDH18 regulate the turnover of MDM2 during CDK4/6 inhibitor therapy-induced senescence