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Palbociclib - Brands
Palbociclib is an inhibitor of Cyclin-dependent kinases (CDK) 4 and 6. cyclin D1 and CDK4/6 are downstream of signaling pathways that lead to cellular proliferation. Palbociclib reduced cellular proliferation of Estrogen receptor (ER)-positive breast cancer cell lines by blocking progression of the cell from G1 into s phase of the cell cycle. Treatment of breast cancer cell lines with the combination of Palbociclib and antiestrogens leads to decreased retinoblastoma (RB) protein phosphorylation resulting in reduced E2F expression and signaling, and increased growth arrest compared to treatment with each drug alone. Treatment of ER-positive breast cancer cell lines with the combination of Palbociclib and antiestrogens led to increased cell senescence compared to each drug alone, which was sustained for up to 6 days following Palbociclib removal and was greater if antiestrogen treatment was continued. In vivo studies using a patient-derived ER-positive breast cancer xenograft model demonstrated that the combination of Palbociclib and letrozole increased the inhibition of RB phosphorylation, downstream signaling, and tumor growth compared to each drug alone.
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