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• W4310147142 abstract "Abstract Resistance to therapy remains a major obstacle in cancer management. Although treatment with hormone and CDK4/6 inhibitors is successful in luminal breast cancer, resistance to these treatments is frequent, highlighting the need for novel therapeutic strategies to delay disease progression and improve patient survival. Here, we assessed the mechanisms of acquired resistance using T47D and MCF-7 tamoxifen- and palbociclib-resistant cell-line variants in culture and as xenografts, and patient-derived cells (PDCs) obtained from sensitive or resistant patient-derived xenografts (PDXs). In these, we analyzed the effect of specific kinase inhibitors on survival, signaling and cellular aggressiveness. We found that mTOR inhibition is more effective than PI3K inhibition in overcoming resistance, irrespective of PIK3CA mutation status, by decreasing cell proliferation and tumor growth, as well as reducing cell migration and stemness. Moreover, a combination of mTOR and CDK4/6 inhibitors may prevent pathway reactivation downstream of PI3K, interfering with the survival of resistant cells and consequent tumor escape. In conclusion, we highlight the benefits of incorporating mTOR inhibitors into the current therapy in ER + breast cancer. This alternative therapeutic strategy not only enhances the antitumor response but may also prevent pathway reactivation, delaying the emergence of resistance and tumor recurrence." @default.
• W4310147142 created "2022-11-30" @default.
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• W4310147142 date "2022-11-28" @default.
• W4310147142 modified "2023-10-18" @default.
• W4310147142 title "Targeting mTOR to overcome resistance to hormone and CDK4/6 inhibitors in ER-positive breast cancer models. " @default.
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• W4310147142 doi "https://doi.org/10.21203/rs.3.rs-2269395/v1" @default.
• W4310147142 hasPublicationYear "2022" @default.
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