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Atezolizumab and Bevacizumab in Treating Patients With Rare Solid Tumors

ABSTRACT: Atezolizumab and Bevacizumab in Treating Patients With Rare Solid Tumors

PROVIDER: PRJNA1190521 | ENA |

REPOSITORIES: ENA

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Atezolizumab and Bevacizumab in Treating Patients With Rare Solid Tumors

Project description:Atezolizumab and Bevacizumab in Treating Patients With Rare Solid Tumors

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Cobimetinib and Atezolizumab in Treating Participants With Advanced or Refractory Rare Tumors

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Serial Changes of Circulating Tumor Cells in Patients with Hepatocellular Carcinoma Treated with Atezolizumab Plus Bevacizumab

Project description:Background and aims: Immune checkpoint inhibitors have promising outcomes in patients with hepatocellular carcinoma (HCC); however, there is no reliable biomarker for predicting disease progression. Circulating tumor cells (CTCs) derived from peripheral blood have attracted attention in monitoring therapeutic efficacy. In this study, CTCs were serially collected from patients with HCC undergoing atezolizumab plus bevacizumab (Atezo+Bev) treatment, and changes in molecular expression and CTC numbers were analyzed to identify effective biomarkers. Approach and results: The peripheral blood samples were collected serially from 22 patients with HCC treated with Atezo+Bev, and CTCs were enriched using RosetteSep. The CD45(-)PanCK(+) cell counts were measured using flow cytometry. RNA extracted from enriched CTCs underwent targeted RNA sequencing with next-generation sequencing (NGS) and performed unsupervised hierarchical clustering analysis. Changes in CTC numbers during Atezo+Bev treatment reflected the tumor volume. NGS analysis revealed that patients with elevated transforming growth factor (TGF)-β signaling molecules had a poorer response, whereas those with elevated apoptosis signaling molecules had a favorable response (p < 0.05). In addition, compared with changes in CTC counts, changes in TGF-β signaling molecule expression in CTCs accurately and promptly predicted treatment response. Conclusions: NGS analysis of CTC-derived RNA showed that changes in TGF-β signaling molecules predict treatment response earlier than changes in CTC counts. These findings suggest that changes in the expression of TGF-β molecules in CTCs could serve as novel biomarkers for the early prediction of therapeutic response in patients with unresectable HCC undergoing Atezo+Bev therapy.

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Clinical activity and molecular correlates of response to atezolizumab alone or in combination with bevacizumab versus sunitinib in renal cell carcinoma

Project description:We examined pre-treatment tumors from participants of the IMmotion150 trial. Biomarker analyses indicate that high angiogenesis gene expression was associated with improved PFS within the sunitinib arm, and high T-effector/IFNγ response (Teff) gene expression with longer PFS in atezolizumab + bevacizumab vs sunitinib patients. In high Teff tumors, concomitant high myeloid inflammation was associated with worse PFS in the atezolizumab monotherapy arm; adding bevacizumab to atezolizumab in this subgroup improved PFS vs atezolizumab. Molecular profiles suggest that prediction of outcomes with VEGF inhibitors and immunotherapy may be possible in mRCC, and bevacizumab may overcome myeloid inflammation-associated atezolizumab resistance.

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Project description:Purpose: To study the potential priming benefit of bevacizumab from subsequent immunotherapy (durvalumab) in advanced breast cancer patients Methods: We tested this hypothesis by adding durvalumab after progression to maintenance single-agent bevacizumab treatment in advanced HER2-negative patients (average 3 treatment lines). In order to study the potential priming benefit, patients had to experience disease progression while on bevacizumab maintenance prior to entering the trial. In addition, we sought to find traits in peripheral-blood mononuclear cells (PBMCs) and tumor biopsies that informed about this immuno-priming, in an attempt to search for novel biomarkers of efficacy of the combo and obtain a better understanding of the biology of this clinical scenario. Results: Patients that experienced clinical benefit, compared with the remaining patients, displayed a lymphocyte pattern in PBMCs consisting on increased T-effector subpopulations (CD4- and CD8- effector and effector-memory) and decreased immunosuppressive T-regulatory cells. Gene-expression studies in tumor samples showed a congruent pattern, with increased T-effector and memory T cell signatures in responders, and increased T-regulatory and decreased active dendritic cells in non-responders. These events were observed in patients that displayed vascular normalization features as a result of previous bevacizumab, supporting the immuno-priming effects of this strategy.

2020-10-15 | GSE139050 | GEO

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