Transcriptome analysis of patient-derived xenograft models of HER2+ breast cancer brain metastases
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ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE80722 | GEO | 2016/06/06
SECONDARY ACCESSION(S): PRJNA319811
REPOSITORIES: GEO
Similar Datasets
Project description:Purpose: There is an unmet clinical need for biomarkers to identify breast cancer patients who are at increased risk of developing brain metastases. The objective is to identify gene signatures and biological pathways associated with HER2+ brain metastasis. Experimental Design: Gene expression of 19 HER2+ breast cancer brain metastases was compared with HER2+ nonmetastatic primary tumors. Gene Set Enrichment Analysis was used to identify a signature, which was evaluated for correlation with BRCA1 mutation status and clinical outcome using published microarray datasets and for correlation with pharmacological inhibition by a PARP inhibitor and temozolomide using published microarray datasets of breast cancer cell lines. Results: A BRCA1 Deficient-Like (BD-L) gene signature is significantly correlated with HER2+ metastases in both our and an independent cohort. BD-L signature is enriched in BRCA1 mutation carrier primary tumors and HER2-/ER- sporadic tumors, but high values are found in a subset of ER+ and HER2+ tumors. Elevated BD-L signature in primary tumors is associated with increased risk of overall relapse, brain relapse, and decreased survival. The BD-L signature correlates with pharmacologic response to PARP inhibitor and temozolomide in two independent microarray datasets, and the signature outperformed four published gene signatures of BRCA1/2 deficiency. Conclusions: The BD-L signature is enriched in breast cancer brain metastases and identifies a subset of primary tumors with increased propensity for brain metastasis. Furthermore, this signature may serve as a biomarker to identify sporadic breast cancer patients who could benefit from a therapeutic combination of PARP inhibitor and temozolomide. Gene expression of 19 HER2+ human breast cancer brain metastases was compared with gene expression of 19 HER2+ nonmetastatic primary human breast tumors.
2014-04-24 | E-GEOD-43837 | biostudies-arrayexpress
Project description:Background: Central nervous system (CNS) metastases represent a major problem in the treatment of HER2-positive breast cancer due to the disappointing efficacy of HER2-targeted therapies in the brain microenvironment. The antibody-drug conjugate ado-trastuzumab emtansine (T-DM1) has shown efficacy in trastuzumab-resistant systemic breast cancer. Here, we tested the hypothesis that T-DM1 could overcome trastuzumab resistance in preclinical models of brain metastases. Methods: We treated mice bearing BT474 or MDA-MB-361 tumors in the CNS (N=9-11 per group), or cancer cells grown in organotypic brain slice cultures with trastuzumab or T-DM1 at equivalent or equipotent doses. Using intravital imaging, molecular techniques and histological analysis we determined tumor growth, mouse survival, cancer cell apoptosis and proliferation, tumor drug distribution, and HER2 signaling. All statistical tests were two-sided. Results: T-DM1 significantly delayed the growth of HER2-positive breast cancer brain metastases compared to trastuzumab. These findings were consistent between HER2-driven and PI3K-driven tumors. The activity of T-DM1 resulted in a striking survival benefit (median survival for BT474 tumors: 28d for trastuzumab vs 112d for T-DM1, HR=6.2, 95% CI=6.1 to 85.84; P<.001). No difference in drug distribution and HER2-signaling was revealed between the two groups. However, T-DM1 led to a significant increase in tumor cell apoptosis (One-way ANOVA for ApopTag, p<.001), which was associated with mitotic catastrophe. Conclusions: T-DM1 can overcome resistance to trastuzumab therapy in HER2-driven and PI3K-driven breast cancer brain lesions due to the cytotoxicity of the DM1 component. Clinical investigation of T-DM1 for patients with CNS metastases from HER2-positive breast cancer is warranted. Comparison of trastuzumab (n=4) and TDM-1 (n=4) treated BT-474 human breast carcinoma cells growing in murine brain
2015-11-09 | E-GEOD-69042 | biostudies-arrayexpress
Project description:The AKT inhibitor MK2206 (M) was one of the experimental agents evaluated in I-SPY 2, a neoadjuvant platform trial for high risk, early stage breast cancer, and graduated in the HER2+, HR-, and HR-HER2+ signatures. Based on the hypotheses that since MK2206 is an enzymatic inhibitor of AKT, response to MK2206 may be predicted by the relative pre-treatment levels of AKT kinase substrates, in pre-defined analyses we assessed 10 genes in the HER-AKT-mTOR pathway to test their association with pCR (complete pathologic response) in the MK2206 arm, in both HER2+ and HER2- subsets. We also tested 9 genes genes previously associated with response to MK2206 in vitro and in the HER2+ metastatic setting, and performed exploratory association analyses using whole-transcriptome data to identify additional predictive signals outside the HER-AKT-mTOR pathway.
2020-09-20 | GSE149322 | GEO
Project description:Purpose: There is an unmet clinical need for biomarkers to identify breast cancer patients who are at increased risk of developing brain metastases. The objective is to identify gene signatures and biological pathways associated with HER2+ brain metastasis. Experimental Design: Gene expression of 19 HER2+ breast cancer brain metastases was compared with HER2+ nonmetastatic primary tumors. Gene Set Enrichment Analysis was used to identify a signature, which was evaluated for correlation with BRCA1 mutation status and clinical outcome using published microarray datasets and for correlation with pharmacological inhibition by a PARP inhibitor and temozolomide using published microarray datasets of breast cancer cell lines. Results: A BRCA1 Deficient-Like (BD-L) gene signature is significantly correlated with HER2+ metastases in both our and an independent cohort. BD-L signature is enriched in BRCA1 mutation carrier primary tumors and HER2-/ER- sporadic tumors, but high values are found in a subset of ER+ and HER2+ tumors. Elevated BD-L signature in primary tumors is associated with increased risk of overall relapse, brain relapse, and decreased survival. The BD-L signature correlates with pharmacologic response to PARP inhibitor and temozolomide in two independent microarray datasets, and the signature outperformed four published gene signatures of BRCA1/2 deficiency. Conclusions: The BD-L signature is enriched in breast cancer brain metastases and identifies a subset of primary tumors with increased propensity for brain metastasis. Furthermore, this signature may serve as a biomarker to identify sporadic breast cancer patients who could benefit from a therapeutic combination of PARP inhibitor and temozolomide.
2014-04-24 | GSE43837 | GEO
Project description:Background: Central nervous system (CNS) metastases represent a major problem in the treatment of HER2-positive breast cancer due to the disappointing efficacy of HER2-targeted therapies in the brain microenvironment. The antibody-drug conjugate ado-trastuzumab emtansine (T-DM1) has shown efficacy in trastuzumab-resistant systemic breast cancer. Here, we tested the hypothesis that T-DM1 could overcome trastuzumab resistance in preclinical models of brain metastases. Methods: We treated mice bearing BT474 or MDA-MB-361 tumors in the CNS (N=9-11 per group), or cancer cells grown in organotypic brain slice cultures with trastuzumab or T-DM1 at equivalent or equipotent doses. Using intravital imaging, molecular techniques and histological analysis we determined tumor growth, mouse survival, cancer cell apoptosis and proliferation, tumor drug distribution, and HER2 signaling. All statistical tests were two-sided. Results: T-DM1 significantly delayed the growth of HER2-positive breast cancer brain metastases compared to trastuzumab. These findings were consistent between HER2-driven and PI3K-driven tumors. The activity of T-DM1 resulted in a striking survival benefit (median survival for BT474 tumors: 28d for trastuzumab vs 112d for T-DM1, HR=6.2, 95% CI=6.1 to 85.84; P<.001). No difference in drug distribution and HER2-signaling was revealed between the two groups. However, T-DM1 led to a significant increase in tumor cell apoptosis (One-way ANOVA for ApopTag, p<.001), which was associated with mitotic catastrophe. Conclusions: T-DM1 can overcome resistance to trastuzumab therapy in HER2-driven and PI3K-driven breast cancer brain lesions due to the cytotoxicity of the DM1 component. Clinical investigation of T-DM1 for patients with CNS metastases from HER2-positive breast cancer is warranted.
2015-11-09 | GSE69042 | GEO
Project description:Background: Metastases to the brain from breast cancer have a high mortality. Basal-like and HER2 positive breast cancers appear to have a high propensity to spread to the brain. The mechanisms that allow cells to colonise the brain are unclear. Methods: We have analysed matched and unpaired samples of breast cancer and brain metastases using morphology, immunophenotype and expression profiling and validated the data using in vitro cell culturing models and in vivo mice model. Results: Most of the brain metastases were triple negative and had a basal-like phenotype. Metastatic cells to the brain over-expressed HER3 compared to primaries and showed evidence of higher activation of the MAPK pathways. Inhibition using anti-neuregulin antibody, Herceptin and Lapatinib reduced tumour growth in vitro and in vivo. Conclusions: The data demonstrate activation of neuregulin-HER3 pathway in brain metastases from breast cancer and suggest that even in absence of HER2 amplification (as with triple negative and basal cancers), anti-epidermal growth factor receptor family inhibitors may have a role in treating these patients.
2009-02-11 | GSE14683 | GEO
Project description:Background: Metastases to the brain from breast cancer have a high mortality. Basal-like and HER2 positive breast cancers appear to have a high propensity to spread to the brain. The mechanisms that allow cells to colonise the brain are unclear. Methods: We have analysed matched and unpaired samples of breast cancer and brain metastases using morphology, immunophenotype and expression profiling and validated the data using in vitro cell culturing models and in vivo mice model. Results: Most of the brain metastases were triple negative and had a basal-like phenotype. Metastatic cells to the brain over-expressed HER3 compared to primaries and showed evidence of higher activation of the MAPK pathways. Inhibition using anti-neuregulin antibody, Herceptin and Lapatinib reduced tumour growth in vitro and in vivo. Conclusions: The data demonstrate activation of neuregulin-HER3 pathway in brain metastases from breast cancer and suggest that even in absence of HER2 amplification (as with triple negative and basal cancers), anti-epidermal growth factor receptor family inhibitors may have a role in treating these patients
2009-02-11 | GSE14682 | GEO
Project description:Brain metastases are an increasing burden among breast cancer patients, particularly for those with HER2+ and triple negative (TN) subtypes. Mechanistic insight into the pathophysiology of brain metastases and preclinical validation of therapies has relied almost exclusively on intracardiac injection of brain-homing cells derived from highly aggressive TN MDA-MB-231 and HER2+ BT474 breast cancer cell lines. Yet, these well characterized models are far from representing the tumor heterogeneity observed clinically and, due to their fast progression in vivo, their suitability to validate therapies for established brain metastasis remains limited. The goal of this study was to develop and characterize novel human brain metastasis breast cancer patient-derived xenografts (BM-PDXs) to study the biology of brain metastasis and to serve as tools for testing novel therapeutic approaches. We obtained freshly resected brain metastases from consenting donors with breast cancer. Tissue was immediately implanted in the mammary fat pad of female immunocompromised mice and expanded as BM-PDXs. Brain metastases from 3/4 (75%) TN, 1/1 (100%) estrogen receptor positive (ER+), and 5/9 (55.5%) HER2+ clinical subtypes were established as transplantable BM-PDXs. To facilitate tracking of metastatic dissemination using BM-PDXs, we labeled PDX-dissociated cells with EGFP-luciferase followed by re-implantation in mice, and generated a BM-derived cell line (F2-7). Immunohistologic analyses demonstrated that parental and labeled BM-PDXs retained expression of critical clinical markers such as ER, progesterone receptor (PR), epidermal growth factor receptor (EGFR), HER2 and the basal cell marker cytokeratin 5 (CK5). Similarly, RNA sequencing analysis showed clustering of parental, labeled BM-PDXs and their corresponding cell line derivative. Intracardiac injection of dissociated cells from BM-E22-1, resulted in MRI-detectable macrometastases in 4/8 (50%) and micrometastases (8/8) (100%) mice, suggesting that BM-PDXs remain capable of colonizing the brain at high frequencies. Brain metastases developed 8 to 12 weeks after ic injection, located to the brain parenchyma, grew around blood vessels and elicited astroglia activation characteristic of breast cancer brain metastasis. These novel BM-PDXs represent heterogeneous and clinically relevant models to study mechanisms of brain metastatic colonization, with the added benefit of a slower progression rate that makes them suitable for preclinical testing of drugs in therapeutic settings.
2018-02-14 | GSE104020 | GEO
Project description:The AKT inhibitor MK2206 (M) was one of the experimental agents evaluated in I-SPY 2, a neoadjuvant platform trial for high risk, early stage breast cancer, and graduated in the HER2+, HR-, and HR-HER2+ signatures. Based on the hypotheses that since MK2206 is an enzymatic inhibitor of AKT, response to MK2206 may be predicted by the relative pre-treatment levels of phosphorylation of AKT kinase substrates, in pre-defined analyses we assessed 26 well known proteins/phospho-proteins in the HER-AKT-mTOR pathway to test their association with pCR in the MK2206 arm, in both HER2+ and HER2- subsets. We specifically used laser capture microdissection (LCM)- enriched tumor epithelium cell isolates from the clinical biopsy specimens as the sample input for all protein pathway activation analysis, which has been shown to be critical in accurate measurement of ubiquitously expressed and activated signaling proteins. To the best of our knowledge, this work represents the first rigorous study of association between direct measurement of AKT pathway activation using phospho-protein activation levels and response to MK2206 performed in early stage breast cancer patients.
2020-09-20 | GSE150575 | GEO
Project description:Brain metastases from breast and other cancers constitute an important part of therapeutic failures and are associated with severe morbidity and mortality. Here, we have examined histopathological data and generated gene expression data in two independent cohorts of primary tumors from HER2-positive advanced breast cancer patients. We report that the combination of estrogen receptor (ER) negativity and expression of a novel 13-gene signature identify a subset of patients with rapid (median, 31 and 41 months in discovery and validation cohorts, respectively) versus slower (median, 66 months and 77 months in discovery and validation cohorts, respectively) development of brain metastases (P<0.0001). The 13-gene signature also predicted rapid brain metastasis formation within the ER-negative subset of patients (P=0.014). Interestingly, three of the genes in the signature (RAD51, BARD1, FANCG) function in DNA double strand break repair. Overexpression of RAD51 in immortal MCF-10A breast epithelial cells altered their three-dimensional acinar morphology to increase the percentage of invasive structures by 6.5 fold, in the presence or absence of HER2 overexpression. In summary, ER negativity and a novel 13-gene signature may have the potential to identify subpopulations at highest immediate risk for the development of brain metastases in HER2-positive advanced breast cancer. Our results also suggest that RAD51, found in the 13-gene signature, may promote aggressiveness in breast epithelial cells. These data may be useful in the design of brain metastasis preventive trials and may prompt new treatment strategies Median normalized data provided
2012-07-01 | GSE38057 | GEO