Project description:In this study, pediatric ALL patient-derived xenografts (PDXs) inherently resistant to glucocorticoids were cultured in vitro. The study aims to determine discrepancy in gene expressions between different xeno strains. The same xenograft was innoculated into 3 mice. Spleen-harvest xenograft samples were analyzed using microarray.

2015-10-24 | E-GEOD-74299 | biostudies-arrayexpress

Gene expression analysis reveals close resemblance between Glioblastoma (GBM) patient tumors and corresponding patient-derived orthotopic xenografts (PDOXs)

Project description:Glioblastoma (GBM) patient-derived orthotopic xenografts (PDOXs) were derived from organotypic spheroids obtained from patient tumor samples. To detect whether gene expression profiles of GBM patient tumors are retained in PDOXs, we performed genome-wide transcript analysis by human-specific microarrays . In parallel, we analyzed GBM cell cultures and corresponding intracranial xenografts from stem-like (NCH421k, NCH644) and adherent GBM cell lines (U87, U251). PDOXs show a better transcriptomic resemblance with patient tumors than other preclinical models. The major difference is largely explained by the depletion of human-derived non-malignant cells.

2020-07-01 | GSE134470 | GEO

Patient-derived Human Breast Cancer Xenografts

Project description:Breast cancer research is hampered by difficulties in obtaining and studying primary human breast tissue, and by the lack of in vivo preclinical models that reflect patient tumor biology accurately. To overcome these limitations, we propagated a cohort of human breast tumors grown in the epithelium-free mammary fat pad of SCID/Beige and NOD/SCID/IL2γ-receptor null (NSG) mice, under a series of transplant conditions. Both models yielded stably transplantable xenografts at comparably high rates (~23% and ~19%, respectively). Of the conditions tested, xenograft take rate was highest in the presence of a low-dose estradiol pellet. Overall, 32 stably transplantable xenograft lines were established, representing unique 25 patients. Most tumors yielding xenografts were “triple-negative” (ER-PR-HER2+) (n=19). However, we established lines from three ER-PR-HER2+ tumors, one ER+PR-HER2-, one ER+PR+HER2- and one “triple-positive” (ER+PR+HER2+) tumor. Serially passaged xenografts show biological consistency with the tumor of origin, are phenotypic stability across multiple transplant generations at the histological, transcriptomic, proteomic, and genomic levels, and show comparable treatment responses. Xenografts representing 12 patients, including two ER+ lines, showed metastasis to the mouse lung. These models thus serve as a renewable, quality-controlled tissue resource for preclinical studies investigating treatment response and metastasis. The study was designed to determine how stable patient-derived xenografts are across multiple transplant generations in mice, and to determine how closely xenografts established with pre-treatment samples cluster with xenografts established with post-treatment samples. Overall, pre-treatment and post-treatment samples derived from the same patient cluster together, and multiple transplant generations of xenografts derived from an individual patient cluster together.

2013-05-30 | E-GEOD-46106 | biostudies-arrayexpress

Proteomics of prostate cancer patient derived xenografts

Project description:A set of 17 prostate cancer patient-derived xenografts (PDX, Lin et al 2014, Cancer research) was analyzed by mass spectrometry-based proteomics to characterize the effects of castration in vivo, and the proteome differences between NEPC and prostate adenocarcinomas.

2019-09-11 | PXD009636 | Pride

DNA methylation analysis of breast cancer patient-derived xenografts and organoids

Project description:To understand if the generation of xenograft and organoid models of breast cancer alters DNA methylation, we compared the genome-wide methylation profile of matching patient tumors, patient derived xenografts, and organoid cultures derived from xenografts.

2022-01-09 | GSE186747 | GEO

Molecular variability of patient-derived colon tumor xenografts

Project description:Molecular variability of patient-derived colon tumor xenografts

| PRJNA449541 | ENA

Patient-derived luminal breast cancer xenografts with progestins

Project description:Patient-derived luminal breast cancer xenografts with progestins

| PRJNA360064 | ENA