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A phase Ib/II Study of Palbociclib in Combination with Bazedoxifene in Hormone Receptor Breast Cancer

ABSTRACT: A phase Ib/II Study of Palbociclib in Combination with Bazedoxifene in Hormone Receptor Breast Cancer

PROVIDER: PRJNA805336 | ENA |

REPOSITORIES: ENA

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A phase Ib/II Study of Palbociclib in Combination with Bazedoxifene in Hormone Receptor Breast Cancer

Project description:A phase Ib/II Study of Palbociclib in Combination with Bazedoxifene in Hormone Receptor Breast Cancer

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RNAseq analysis of taxol and palbociclib combination in pancreatic cancer

Project description:RNAseq from pancreatic cancer cell lines treated with DMSO, taxol, palbociclib or the combination at short-term time-points.

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2023-08-14 | E-MTAB-13262 | biostudies-arrayexpress

Inhibition of CDK6 using Palbociclib in combination with Ruxolitinib markedly improves myelofibrosis in murine models

Project description:Myelofibrosis (MF) is a deadly blood neoplasia that presents the worst prognosis among myeloproliferative neoplasms (MPN). Expression of CDK6 is significantly elevated in MPN/MF hematopoietic progenitor cells. In this study, we investigated the efficacy of CDK4/6 inhibitor Palbociclib alone or in combination with Ruxolitinib in Jak2V617F and MPLW515L murine models of MF. Treatment of Palbociclib alone significantly reduced leukocytosis, splenomegaly and inhibited bone marrow fibrosis in Jak2V617F and MPLW515L mouse models of MF. Combined treatment of Palbociclib and Ruxolitinib resulted in normalization of peripheral blood leukocyte counts, marked reduction of spleen size and abrogation of bone marrow fibrosis in murine models of MF. Mechanistically, we show that Palbociclib treatment or depletion of CDK6 inhibits Aurora kinase, NF-κB and TGF-β signaling pathways in Jak2V617F mutant hematopoietic cells. Overall, our data suggest that Palbociclib in combination with Ruxolitinib may have therapeutic potential for treatment of MF.

2021-11-05 | GSE173814 | GEO

RNAseq analysis of taxol and palbociclib combination in pancreatic cancer

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MARC Phase Ib E. coli

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Efficacy of abemaciclib in palbociclib-resistant hormone receptor positive organoids derived from patient derived xenografts from patients who progressed on palbociclib

Project description:Resistance to CDK4/6 inhibitors plus endocrine therapy, standard of care for HR+/HER2-neg metastatic breast cancer (MBC) patients, remains as a clinical problem with limited therapeutic options after disease progression. Treatment with abemaciclib after progression on a prior CDK4/6i has received increasing interest. However, molecular predictors of cross-resistance and unique mechanism of resistance to each CDK4/6i are unknown. In this study, multiomics analyses revealed ≥30 differentially altered pathways between palbociclib and abemaciclib resistant models. Mechanistic, preclinical and retrospective clinical evidence showed that HR+/HER2-neg MBC tumors refractory to palbociclib still may be responsive to abemaciclib. Based on the unique mechanisms of resistance to each CDK4/6i, we propose that patients who would benefit from abemaciclib treatment post progression on palbociclib could be selected based on the Hallmark gene set enrichment of G2/M pathway, while those who most probably would be refractory could be identified base on the gene set enrichment of OXPHOS pathway.

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Efficacy of abemaciclib in palbociclib-resistant hormone receptor positive organoids derived from patient derived xenografts from patients who progressed on palbociclib

Project description:Efficacy of abemaciclib in palbociclib-resistant hormone receptor positive organoids derived from patient derived xenografts from patients who progressed on palbociclib

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MHC Class Ib-restricted CD8+ T Cells Possess Strong Tumoricidal Activities

Project description:The tumoricidal effects of CD8+T cells are well acknowledged, but how MHC Ib-restricted CD8+T (Ib-CD8+T) cells contribute to anti-tumor immunity remains obscure. Here, we show that infusion of MHC Ia+ cells to Kb-/-Db-/- mice induced the expansion of Ib-CD8+T cells in tumors and potently inhibited tumor progression. Such priming of Ib-CD8+T cells by MHC-Ia is not MHC haplotype restricted and MHC Ia tetramers alone can prime Ib-CD8+T cells for activation. The MHC Ia priming promoted Tbet expression in Ib-CD8+T cells and in absence of Tbet, such priming effect diminished. Importantly, these tumoricidal Ib-CD8+T cells are positive for CX3CR1, and exhibit rapid proliferation, high expression of cytotoxic factors, and prolonged persistence at tumor sites. Adoptive transfer of CX3CR1+Ib-CD8+T cells to wild type mice resulted in potent anti-tumor effects. Our findings unravel an uncharacterized function of MHC Ia molecules in immunoregulation and raise the possibility of using Ib-CD8+T cells in tumor immunotherapy.

2023-10-03 | GSE164271 | GEO

Palbociclib interferes with origin firing in a pRb independent manner

Project description:Over the last decade, CDK4/6 inhibitors (palbociclib, ribociclib and abemaciclib) have emerged as promising anticancer drugs. Numerous studies have demonstrated that CDK4/6 inhibitors efficiently block the pRb-E2F pathway and induce cell cycle arrest in pRb-proficient cells. Based on these studies, the inhibitors have been approved by the FDA for treatment of advanced hormonal receptor (HR) positive breast cancers in combination with hormonal therapy. However, some evidence has recently shown unexpected effects of the inhibitors, promoting needs to understand more about the mechanism of inhibitors beyond pRb. Our study demonstrates here for the first time how palbociclib impairs the origin firing in the DNA replication process in pRb-deficient cell lines. Strikingly, despite the absence of pRb, cells treated with palbociclib synthesize less DNA without any induced cell cycle arrest. Furthermore, palbociclib treatment disturbs the temporal program of DNA replication and reduces the density of replication forks. Cells treated with palbociclib show a defect in the loading of proteins of the Pre-initiation complex (Pre-IC) on chromatin, indicating a reduced initiation of DNA replication. Our findings highlight hidden effects of palbociclib on the dynamics of DNA replication and on its cytotoxic consequences on cell viability in the absence of pRb. This study provides a potential therapeutic application of palbociclib to target genomic instability towards pRb deficient patient

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