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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/202133
CCNE1 and PLK1 Mediate Resistance to Palbociclib in HR+/HER2−Metastatic Breast Cancer
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Purpose: In hormone receptor???positive (HR+)/HER2- meta-static breast cancer (MBC), it is imperative to identify patients who respond poorly to cyclin-dependent kinase 4/6 inhibitors (CDK4/ 6i) and to discover therapeutic targets to reverse this resistance. Non-luminal breast cancer subtype and high levels of CCNE1 are candidate biomarkers in this setting, but further validation is needed. Experimental Design: We performed mRNA gene expression profiling and correlation with progression-free survival (PFS) on 455 tumor samples included in the phase III PEARL study, which assigned patients with HR+/HER2-MBC to receive palbociclib+endocrine therapy (ET) versus capecitabine. Estrogen receptor???positive (ER+)/ HER2-breast cancer cell lines were used to generate and characterize resistance to palbociclib+ET. Results: Non-luminal subtype was more prevalent in meta-static (14%) than in primary tumor samples (4%). Patients with??non-luminal tumors had median PFS of 2.4 months with palbociclib+ET and 9.3 months with capecitabine; HR 4.16, adjusted P value < 0.0001. Tumors with high CCNE1 expression (above median) also had worse median PFS with palbociclib+ET (6.2 months) than with capecitabine (9.3 months); HR 1.55, adjusted P value = 0.0036. In patients refractory to palbociclib+ET (PFS in the lower quartile), we found higher levels of Polo-like kinase 1 (PLK1). In an independent data set (PALOMA3), tumors with high PLK1 show worse median PFS than those with low PLK1 expression under palbociclib+ET treatment. In ER+/HER2-cell line models, we show that PLK1 inhibition reverses resistance to palbociclib+ET. Conclusions: We confirm the association of non-luminal sub-type and CCNE1 with resistance to CDK4/6i+ET in HR+ MBC. High levels of PLK1 mRNA identify patients with poor response to palbociclib, suggesting PLK1 could also play a role in the setting of resistance to CDK4/6i.
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GUERRERO ZOTANO, Ángel, et al. CCNE1 and PLK1 Mediate Resistance to Palbociclib in HR+/HER2−Metastatic Breast Cancer. Clinical Cancer Research. 2023. Vol. 29, num. 8, pags. 1557-1568. ISSN 1557-3265. [consulted: 17 of August of 2026]. Available at: https://hdl.handle.net/2445/202133