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    Association details:
    Biomarker:ER positive
    Cancer:Estrogen Receptor Positive Breast Cancer
    Drug:Verzenio (abemaciclib) (CDK4 inhibitor, CDK6 inhibitor)
    Direction:Sensitive
    Evidence:
    Evidence Level:
    Sensitive: C2 – Inclusion Criteria
    Source:
    clinicaltrials.gov
    Title:

    Fulvestrant+Abemaciclib With Run-In of Fulvestrant in Er-Positive, Her2-Negative Metastatic Breast Cancer

    Excerpt:
    ...Histologically confirmed ER-positive, HER2-negative metastatic breast cancer....
    Trial ID:
    NCT05305924
    Evidence Level:
    Sensitive: D – Preclinical
    Source:
    AACR-II 2020
    Title:

    6280 / 15 - CDK4/6 inhibitor-mediatated radiosensitization of estrogen receptor positive breast cancer

    Published date:
    05/15/2020
    Excerpt:
    Palbociclib significantly radiosensitized ER+ cell lines at concentrations at or below the IC50 value in clonogenic survival assays (MCF-7 rER: 1.22-1.52, T47D rER: 1.23-1.50) and led to a decrease in the surviving fraction of cells at 2 Gy (p < 0.001). Similar results were observed in ribociclib- (rER: 1.08 - 1.68) and abemaciclib-treated (rER: 1.19 - 2.05) cells....Our data suggests that CDK4/6 inhibitor-mediated radiosensitization may be effective in ER+ breast cancers prior to the development of CDK4/6 inhibitor resistance.