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RNA sequencing of chemotherapy-resistant muscle-invasive urothelial bladder cancer

ABSTRACT: This SuperSeries is composed of the SubSeries listed below.

ORGANISM(S): Mus musculus Homo sapiens

PROVIDER: GSE145140 | GEO | 2020/03/26

REPOSITORIES: GEO

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Whole transcriptome sequencing of chemotherapy-resistant muscle-invasive urothelial bladder cancer

Project description:To identify the therapeutic targets in a treatment-refractroy cancer patient, we performed single-cell RNA sequencing for 3,115 cells from primary bladder cancer (BC159-T#3) and patient-derived xenografts (BC159-T#3-PDX-vehicle and BC159-T#3-PDX-tipifarnib). Matched time-series bulk tumor tissues were also sequenced using whole exome target probe (WES) and whole transcriptome target probe (WTS).

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RNA sequencing of chemotherapy-resistant muscle-invasive urothelial bladder cancer

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Project description:Despite continued widespread use, the genomic effects of cisplatin-based chemotherapy and implications for subsequent treatment are incompletely characterized. Here, we analyze whole exome sequencing of matched pre- and post-neoadjuvant cisplatin-based chemotherapy primary bladder tumor samples from 30 muscle-invasive bladder cancer patients. We observe no overall increase in tumor mutational burden post-chemotherapy, though a significant proportion of subclonal mutations are unique to the matched pre- or post-treatment tumor, suggesting chemotherapy-induced and/or spatial heterogeneity. We subsequently identify and validate a novel mutational signature in post-treatment tumors consistent with known characteristics of cisplatin damage and repair. We find that post-treatment tumor heterogeneity predicts worse overall survival, and further observe alterations in cell-cycle and immune checkpoint regulation genes in post-treatment tumors. These results provide insight into the clinical and genomic dynamics of tumor evolution with cisplatin-based chemotherapy, suggest mechanisms of clinical resistance, and inform development of clinically relevant biomarkers and trials of combination therapies.

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Whole transcriptome sequencing of chemotherapy-resistant muscle-invasive urothelial bladder cancer

Project description:All mRNA sequencing data were acquired from single patients (BC159T) at a different time (BC159-T#1, BC159-T#2, and BC159-T#3). The first transurethral resection of bladder tumor (TUR-BT) (BC159-T#1) was diagnosed with non-MIUBC (muscle-invasive urothelial bladder cancer). Despite of intravesical bacillus Calmette-Guerin (BCG), the patient progressed into MIUBC at the second TUR-BT (BC159-T#2). After undergoing multiple neoadjuvant chemotherapy regimens (gemcitabine/paclitaxel and sequential paclitaxel), the patient developed local recurrence and multiple lung metastases and removed following palliative partial cystectomy (BC159-T#3).

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