Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 17 de 17
Filtrar
1.
Ann Surg ; 276(1): 119-127, 2022 07 01.
Artigo em Inglês | MEDLINE | ID: mdl-35703462

RESUMO

OBJECTIVE: To describe expected endoscopic and histological changes at gastro-esophageal junction (GEJ) and define diagnostic paradigms for Barrett esophagus (BE) postsleeve gastrectomy (SG). SUMMARY BACKGROUND DATA: De novo incidence of BE post SG was reported as high as 18.8%. A confounding factor is the lack of standardized definition of BE post SG, which may differ from the general population due to procedure-induced alterations of GEJ. METHODS: Part 1 involved evaluating endoscopic changes of GEJ post SG (N = 567) compared to pre SG (N = 320), utilizing protocolized preoperative screening, postoperative surveillance and synoptic reporting. Part 2 involved dedicated studies examining causes of altered anatomical and mucosal GEJ appearance using histopathology (N = 55) and high-resolution manometry (HRM) (N = 15). RESULTS: Part 1 - A characteristic tubularized cardia segment projecting supra-diaphragmatically was identified and almost exclusive to post SG (0.6% vs.26.6%, P < 0.001). True BE prevalence was low (4.1%pre SG vs. 3.8%post SG, P = 0.756), esophagitis was comparable (32.1% vs. 25.9%, P = 0.056). Part 2 - Histologically-confirmed BE was found in 12/55 patients, but 70.8% had glandular-type gastric mucosa implying tubularized cardia herniation. HRM of tubularized cardia demonstrated concordance of supra-diaphragmatic cardia herniation between endoscopy and HRM (3 cm vs. 3.2 cm, P = 0.168), with frequent elevated isobaric intraluminal pressurizations in supra-and infra-diaphragmatic cardia compartments. CONCLUSION: A novel appearance of tubularized cardia telescoping supra-diaphragmatically with flattening of gastric folds is common post SG, likely associated with isobaric hyper-pressurization of proximal stomach. incidence of true BE post SG is low in short-intermediate term. These provided a clear framework for approaching endoscopic screening and surveillance, with correct anatomical and mucosal identifications, and clarified key issues of SG and BE.


Assuntos
Esôfago de Barrett , Cárdia , Esôfago de Barrett/patologia , Cárdia/patologia , Endoscopia Gastrointestinal/efeitos adversos , Gastrectomia/efeitos adversos , Humanos , Manometria
2.
Nat Commun ; 12(1): 5049, 2021 08 19.
Artigo em Inglês | MEDLINE | ID: mdl-34413304

RESUMO

Preclinical testing is a crucial step in evaluating cancer therapeutics. We aimed to establish a significant resource of patient-derived xenografts (PDXs) of prostate cancer for rapid and systematic evaluation of candidate therapies. The PDX collection comprises 59 tumors collected from 30 patients between 2012-2020, coinciding with availability of abiraterone and enzalutamide. The PDXs represent the clinico-pathological and genomic spectrum of prostate cancer, from treatment-naïve primary tumors to castration-resistant metastases. Inter- and intra-tumor heterogeneity in adenocarcinoma and neuroendocrine phenotypes is evident from bulk and single-cell RNA sequencing data. Organoids can be cultured from PDXs, providing further capabilities for preclinical studies. Using a 1 x 1 x 1 design, we rapidly identify tumors with exceptional responses to combination treatments. To govern the distribution of PDXs, we formed the Melbourne Urological Research Alliance (MURAL). This PDX collection is a substantial resource, expanding the capacity to test and prioritize effective treatments for prospective clinical trials in prostate cancer.


Assuntos
Avaliação Pré-Clínica de Medicamentos/métodos , Organoides/patologia , Neoplasias da Próstata/patologia , Animais , Modelos Animais de Doenças , Genoma , Humanos , Masculino , Camundongos , Camundongos Endogâmicos NOD , Camundongos SCID , Mutação , Metástase Neoplásica , Organoides/metabolismo , Estudos Prospectivos , Neoplasias da Próstata/tratamento farmacológico , Neoplasias da Próstata/genética , Neoplasias da Próstata/metabolismo , Bancos de Tecidos , Transcriptoma , Ensaios Antitumorais Modelo de Xenoenxerto
3.
JCO Precis Oncol ; 52021 06.
Artigo em Inglês | MEDLINE | ID: mdl-34322653

RESUMO

PURPOSE: Androgen receptor (AR) signaling is important in prostate cancer progression, and therapies that target this pathway have been the mainstay of treatment for advanced disease for over 70 years. Tumors eventually progress despite castration through a number of well-characterized mechanisms; however, little is known about what determines the magnitude of response to short-term pathway inhibition. METHODS: We evaluated a novel combination of AR-targeting therapies (degarelix, abiraterone, and bicalutamide) and noted that the objective patient response to therapy was highly variable. To investigate what was driving treatment resistance in poorly responding patients, as a secondary outcome we comprehensively characterized pre- and post-treatment samples using both whole-genome and RNA sequencing. RESULTS: We find that resistance following short-term treatment differs molecularly from typical progressive castration-resistant disease, associated with transcriptional reprogramming, to a transitional epithelial-to-mesenchymal transition (EMT) phenotype rather than an upregulation of AR signaling. Unexpectedly, tolerance to therapy appears to be the default state, with treatment response correlating with the prevalence of tumor cells deficient for SNAI2, a key regulator of EMT reprogramming. CONCLUSION: We show that EMT characterizes acutely resistant prostate tumors and that deletion of SNAI2, a key transcriptional regulator of EMT, correlates with clinical response.


Assuntos
Antagonistas de Androgênios/administração & dosagem , Antineoplásicos Hormonais/administração & dosagem , Transição Epitelial-Mesenquimal/genética , Neoplasias de Próstata Resistentes à Castração/tratamento farmacológico , Fatores de Transcrição da Família Snail/genética , Idoso , Antagonistas de Androgênios/efeitos adversos , Androstenos , Anilidas , Antineoplásicos Hormonais/efeitos adversos , Resistencia a Medicamentos Antineoplásicos/genética , Regulação Neoplásica da Expressão Gênica/genética , Humanos , Masculino , Nitrilas , Oligopeptídeos , Neoplasias de Próstata Resistentes à Castração/genética , Neoplasias de Próstata Resistentes à Castração/patologia , Transdução de Sinais , Fatores de Transcrição da Família Snail/deficiência , Compostos de Tosil
4.
Viruses ; 13(3)2021 03 10.
Artigo em Inglês | MEDLINE | ID: mdl-33802118

RESUMO

Heightened expression of human endogenous retrovirus (HERV) sequences has been associated with a range of malignancies, including prostate cancer, suggesting that they may serve as useful diagnostic or prognostic cancer biomarkers. We analysed the expression of HERV-K (Gag and Env/Np9 regions), HERV-E 4.1 (Pol and Env regions), HERV-H (Pol) and HERV-W (Gag) sequences in prostate cancer cells lines and normal prostate epithelial cells using qRT-PCR. HERV expression was also analysed in matched malignant and benign prostate tissue samples from men with prostate cancer (n = 27, median age 65.2 years (range 47-70)) and compared to prostate cancer-free male controls (n = 11). Prostate cancer epithelial cell lines exhibited a signature of HERV RNA overexpression, with all HERVs analysed, except HERV-E Pol, showing heightened expression in at least two, but more commonly all, cell lines analysed. Analysis of primary prostate material indicated increased expression of HERV-E Pol but decreased expression of HERV-E Env in both malignant and benign regions of the prostate in men with prostate cancer as compared to those without. Expression of HERV-K Gag was significantly higher in malignant regions of the prostate in men with prostate cancer as compared to matched benign regions and prostate cancer-free men (p < 0.001 for both), with 85.2% of prostate cancers donors showing malignancy-associated upregulation of HERV-K Gag RNA. HERV-K Gag protein was detected in 12/18 (66.7%) malignant tissues using immunohistochemistry, but only 1/18 (5.6%) benign tissue sections. Heightened expression of HERV-K Gag RNA and protein appears to be a sensitive and specific biomarker of prostate malignancy in this cohort of men with prostate carcinoma, supporting its potential utility as a non-invasive, adjunct clinical biomarker.


Assuntos
Retrovirus Endógenos/genética , Produtos do Gene env/genética , Produtos do Gene gag/genética , Produtos do Gene pol/genética , Neoplasias da Próstata/genética , Idoso , Biomarcadores Tumorais/genética , Linhagem Celular Tumoral , Retrovirus Endógenos/isolamento & purificação , Regulação Neoplásica da Expressão Gênica/genética , Produtos do Gene env/metabolismo , Produtos do Gene gag/metabolismo , Produtos do Gene pol/metabolismo , Humanos , Masculino , Pessoa de Meia-Idade , Próstata/metabolismo , Neoplasias da Próstata/diagnóstico
6.
Clin Epigenetics ; 12(1): 48, 2020 03 18.
Artigo em Inglês | MEDLINE | ID: mdl-32188493

RESUMO

BACKGROUND: Prostate cancer changes the phenotype of cells within the stromal microenvironment, including fibroblasts, which in turn promote tumour progression. Functional changes in prostate cancer-associated fibroblasts (CAFs) coincide with alterations in DNA methylation levels at loci-specific regulatory regions. Yet, it is not clear how these methylation changes compare across CAFs from different patients. Therefore, we examined the consistency and prognostic significance of genome-wide DNA methylation profiles between CAFs from patients with different grades of primary prostate cancer. RESULTS: We used Infinium MethylationEPIC BeadChips to evaluate genome-wide DNA methylation profiles from 18 matched CAFs and non-malignant prostate tissue fibroblasts (NPFs) from men with moderate to high grade prostate cancer, as well as five unmatched benign prostate tissue fibroblasts (BPFs) from men with benign prostatic hyperplasia. We identified two sets of differentially methylated regions (DMRs) in patient CAFs. One set of DMRs reproducibly differed between CAFs and fibroblasts from non-malignant tissue (NPFs and BPFs). Indeed, more than 1200 DMRs consistently changed in CAFs from every patient, regardless of tumour grade. The second set of DMRs varied between CAFs according to the severity of the tumour. Notably, hypomethylation of the EDARADD promoter occurred specifically in CAFs from high-grade tumours and correlated with increased transcript abundance and increased EDARADD staining in patient tissue. Across multiple cohorts, tumours with low EDARADD DNA methylation and high EDARADD mRNA expression were consistently associated with adverse clinical features and shorter recurrence free survival. CONCLUSIONS: We identified a large set of DMRs that are commonly shared across CAFs regardless of tumour grade and outcome, demonstrating highly consistent epigenome changes in the prostate tumour microenvironment. Additionally, we found that CAFs from aggressive prostate cancers have discrete methylation differences compared to CAFs from moderate risk prostate cancer. Together, our data demonstrates that the methylome of the tumour microenvironment reflects both the presence and the severity of the prostate cancer and, therefore, may provide diagnostic and prognostic potential.


Assuntos
Fibroblastos Associados a Câncer/patologia , Metilação de DNA , Proteína de Domínio de Morte Associada a Edar/genética , Análise de Sequência com Séries de Oligonucleotídeos/métodos , Hiperplasia Prostática/patologia , Neoplasias da Próstata/patologia , Idoso , Fibroblastos Associados a Câncer/química , Estudos de Casos e Controles , Epigênese Genética , Regulação Neoplásica da Expressão Gênica , Humanos , Masculino , Pessoa de Meia-Idade , Gradação de Tumores , Prognóstico , Regiões Promotoras Genéticas , Hiperplasia Prostática/genética , Neoplasias da Próstata/genética , Análise de Sobrevida , Células Tumorais Cultivadas , Microambiente Tumoral , Regulação para Cima
7.
BMJ Case Rep ; 12(12)2019 Dec 23.
Artigo em Inglês | MEDLINE | ID: mdl-31874850

RESUMO

​We report the case of a 55-year-old male patient with an incidental finding on CT of a 'large adrenal mass'. The mass, which was intimately related to the left adrenal, was enhancing but not metabolically active. CT showed a 40×32 mm mass adjacent to the left adrenal and medial border of the spleen, 32 Hounsfield units (HU) precontrast and 116 HU postcontrast, consistent with a solid enhancing mass. The patient had no previous history of acute pancreatitis or any history of trauma. The patient proceeded to a laparoscopic left adrenalectomy; intraoperatively, a well-circumscribed lesion was identified intimately related to the splenic artery and able to be peeled away easily from the left adrenal. The lesion was unable to be dissected from the splenic artery and consequently the splenic artery was divided in order to completely resect this lesion. Histopathology identified the lesion as a 'non-pancreatic fibrous pseudocyst', with a thick calcified wall, the absence of epithelial lining and widespread inflammatory change.


Assuntos
Doenças das Glândulas Suprarrenais/diagnóstico , Cistos/diagnóstico , Neoplasias Retroperitoneais/diagnóstico , Calcinose/diagnóstico , Diagnóstico Diferencial , Humanos , Achados Incidentais , Masculino , Pessoa de Meia-Idade , Pseudocisto Pancreático/diagnóstico , Tomografia Computadorizada por Raios X
8.
Prostate ; 79(11): 1326-1337, 2019 08.
Artigo em Inglês | MEDLINE | ID: mdl-31212368

RESUMO

BACKGROUND: Serially transplantable patient-derived xenografts (PDXs) are invaluable preclinical models for studying tumor biology and evaluating therapeutic agents. As these models are challenging to establish from prostate cancer specimens, the ability to preserve them through cryopreservation has several advantages for ongoing research. Despite this, there is still uncertainty about the ability to cryopreserve PDXs of prostate cancer. This study compared three different cryopreservation protocols to identify a method that can be used to reproducibly cryopreserve a diverse cohort of prostate cancer PDX models. METHODS: One serially transplantable prostate cancer PDX from the Melbourne Urological Research Alliance cohort was used to compare three cryopreservation protocols: slow freezing in fetal calf serum (FCS) with 10% dimethyl sulfoxide (DMSO), FCS with 10% DMSO supplemented with the Rho-associated kinase (ROCK) inhibitor Y-27632 and vitrification. The efficiency of the slow freezing protocols was then assessed in 17 additional prostate cancer PDXs. Following cryopreservation, PDXs were re-established in host mice that were either intact and supplemented with testosterone or castrated. Graft take rate, tumor growth, histological features, and transcriptome profiles before and after cryopreservation were compared. RESULTS: Slow freezing maintained the viability and histological features of prostate cancer PDXs, and the addition of a ROCK inhibitor increased their growth following cryopreservation. Using the slow freezing method, we re-established 100% of PDXs grown in either testosterone-supplemented or castrated host mice. Importantly, the long-term tumor growth rate and transcriptome profile were maintained following cryopreservation. CONCLUSION: This study has identified a protocol to reliably cryopreserve and re-establish a diverse cohort of serially transplantable PDXs of prostate cancer. This study has the potential to significantly improve the practicality of maintaining PDX models. Cryopreservation may also increase the accessibility of these important resources and provide new opportunities for preclinical studies on a broader spectrum of prostate tumors.


Assuntos
Criopreservação/métodos , Xenoenxertos , Transplante de Neoplasias/métodos , Neoplasias da Próstata/patologia , Animais , Modelos Animais de Doenças , Humanos , Masculino , Camundongos , Transplante de Neoplasias/patologia
9.
Sci Transl Med ; 11(478)2019 02 06.
Artigo em Inglês | MEDLINE | ID: mdl-30728288

RESUMO

Metabolism alterations are hallmarks of cancer, but the involvement of lipid metabolism in disease progression is unclear. We investigated the role of lipid metabolism in prostate cancer using tissue from patients with prostate cancer and patient-derived xenograft mouse models. We showed that fatty acid uptake was increased in human prostate cancer and that these fatty acids were directed toward biomass production. These changes were mediated, at least partly, by the fatty acid transporter CD36, which was associated with aggressive disease. Deleting Cd36 in the prostate of cancer-susceptible Pten-/- mice reduced fatty acid uptake and the abundance of oncogenic signaling lipids and slowed cancer progression. Moreover, CD36 antibody therapy reduced cancer severity in patient-derived xenografts. We further demonstrated cross-talk between fatty acid uptake and de novo lipogenesis and found that dual targeting of these pathways more potently inhibited proliferation of human cancer-derived organoids compared to the single treatments. These findings identify a critical role for CD36-mediated fatty acid uptake in prostate cancer and suggest that targeting fatty acid uptake might be an effective strategy for treating prostate cancer.


Assuntos
Ácidos Graxos/metabolismo , Neoplasias da Próstata/tratamento farmacológico , Animais , Anticorpos Monoclonais/metabolismo , Biomassa , Antígenos CD36/metabolismo , Linhagem Celular Tumoral , Modelos Animais de Doenças , Progressão da Doença , Células Epiteliais/metabolismo , Deleção de Genes , Inativação Gênica , Humanos , Metabolismo dos Lipídeos , Masculino , Camundongos , Invasividade Neoplásica , PTEN Fosfo-Hidrolase/deficiência , PTEN Fosfo-Hidrolase/metabolismo , Próstata/metabolismo , Próstata/patologia , Neoplasias da Próstata/metabolismo , Neoplasias da Próstata/patologia , RNA Interferente Pequeno/metabolismo , Carga Tumoral
10.
Eur Urol ; 74(5): 562-572, 2018 11.
Artigo em Inglês | MEDLINE | ID: mdl-30049486

RESUMO

BACKGROUND: The intractability of castration-resistant prostate cancer (CRPC) is exacerbated by tumour heterogeneity, including diverse alterations to the androgen receptor (AR) axis and AR-independent phenotypes. The availability of additional models encompassing this heterogeneity would facilitate the identification of more effective therapies for CRPC. OBJECTIVE: To discover therapeutic strategies by exploiting patient-derived models that exemplify the heterogeneity of CRPC. DESIGN, SETTING, AND PARTICIPANTS: Four new patient-derived xenografts (PDXs) were established from independent metastases of two patients and characterised using integrative genomics. A panel of rationally selected drugs was tested using an innovative ex vivo PDX culture system. INTERVENTION: The following drugs were evaluated: AR signalling inhibitors (enzalutamide and galeterone), a PARP inhibitor (talazoparib), a chemotherapeutic (cisplatin), a CDK4/6 inhibitor (ribociclib), bromodomain and extraterminal (BET) protein inhibitors (iBET151 and JQ1), and inhibitors of ribosome biogenesis/function (RNA polymerase I inhibitor CX-5461 and pan-PIM kinase inhibitor CX-6258). OUTCOME MEASUREMENTS AND STATISTICAL ANALYSIS: Drug efficacy in ex vivo cultures of PDX tissues was evaluated using immunohistochemistry for Ki67 and cleaved caspase-3 levels. Candidate drugs were also tested for antitumour efficacy in vivo, with tumour volume being the primary endpoint. Two-tailed t tests were used to compare drug and control treatments. RESULTS AND LIMITATIONS: Integrative genomics revealed that the new PDXs exhibited heterogeneous mechanisms of resistance, including known and novel AR mutations, genomic structural rearrangements of the AR gene, and a neuroendocrine-like AR-null phenotype. Despite their heterogeneity, all models were sensitive to the combination of ribosome-targeting agents CX-5461 and CX-6258. CONCLUSIONS: This study demonstrates that ribosome-targeting drugs may be effective against diverse CRPC subtypes including AR-null disease, and highlights the potential of contemporary patient-derived models to prioritise treatment strategies for clinical translation. PATIENT SUMMARY: Diverse types of therapy-resistant prostate cancers are sensitive to a new combination of drugs that inhibit protein synthesis pathways in cancer cells.


Assuntos
Androstenos/farmacologia , Antineoplásicos/farmacologia , Protocolos de Quimioterapia Combinada Antineoplásica/farmacologia , Azepinas/farmacologia , Benzotiazóis/farmacologia , Resistencia a Medicamentos Antineoplásicos , Indóis/farmacologia , Naftiridinas/farmacologia , Feniltioidantoína/análogos & derivados , Neoplasias de Próstata Resistentes à Castração/tratamento farmacológico , Ribossomos/efeitos dos fármacos , Animais , Benzamidas , Humanos , Masculino , Camundongos Endogâmicos NOD , Camundongos SCID , Terapia de Alvo Molecular , Nitrilas , Feniltioidantoína/farmacologia , Neoplasias de Próstata Resistentes à Castração/enzimologia , Neoplasias de Próstata Resistentes à Castração/genética , Neoplasias de Próstata Resistentes à Castração/patologia , Proteínas Proto-Oncogênicas c-pim-1/antagonistas & inibidores , Proteínas Proto-Oncogênicas c-pim-1/metabolismo , RNA Polimerase I/antagonistas & inibidores , RNA Polimerase I/genética , RNA Polimerase I/metabolismo , Ribossomos/enzimologia , Ribossomos/genética , Fatores de Tempo , Carga Tumoral/efeitos dos fármacos , Ensaios Antitumorais Modelo de Xenoenxerto
11.
Genome Res ; 28(5): 625-638, 2018 05.
Artigo em Inglês | MEDLINE | ID: mdl-29650553

RESUMO

The growth and progression of solid tumors involves dynamic cross-talk between cancer epithelium and the surrounding microenvironment. To date, molecular profiling has largely been restricted to the epithelial component of tumors; therefore, features underpinning the persistent protumorigenic phenotype of the tumor microenvironment are unknown. Using whole-genome bisulfite sequencing, we show for the first time that cancer-associated fibroblasts (CAFs) from localized prostate cancer display remarkably distinct and enduring genome-wide changes in DNA methylation, significantly at enhancers and promoters, compared to nonmalignant prostate fibroblasts (NPFs). Differentially methylated regions associated with changes in gene expression have cancer-related functions and accurately distinguish CAFs from NPFs. Remarkably, a subset of changes is shared with prostate cancer epithelial cells, revealing the new concept of tumor-specific epigenome modifications in the tumor and its microenvironment. The distinct methylome of CAFs provides a novel epigenetic hallmark of the cancer microenvironment and promises new biomarkers to improve interpretation of diagnostic samples.


Assuntos
Metilação de DNA , Epigenômica/métodos , Neoplasias da Próstata/genética , Microambiente Tumoral/genética , Fibroblastos Associados a Câncer/metabolismo , Células Cultivadas , Fibroblastos/metabolismo , Perfilação da Expressão Gênica , Regulação Neoplásica da Expressão Gênica , Genoma Humano/genética , Humanos , Masculino , Regiões Promotoras Genéticas/genética , Neoplasias da Próstata/patologia , Sequenciamento Completo do Genoma/métodos
12.
BJU Int ; 121(6): 971-978, 2018 06.
Artigo em Inglês | MEDLINE | ID: mdl-28977728

RESUMO

OBJECTIVE: To determine the relevance of intraductal carcinoma of the prostate (IDC-P) in advanced prostate cancer by first examining whether IDC-P was originally present in patients who later developed advanced prostate cancer and then using patient-derived xenografts (PDXs) to investigate the response of IDC-P to androgen deprivation therapy (ADT). MATERIALS AND METHODS: We conducted a retrospective pathology review of IDC-P in primary prostate biopsy or surgery specimens from 38 men who subsequently developed advanced prostate cancer. Overall survival was calculated using the Kaplan-Meier method. To demonstrate the response of IDC-P to ADT, we established PDXs from seven patients with familial and/or high-risk sporadic prostate cancer. After castration and testosterone restoration of host mice, we measured the volume and proliferation of IDC-P within PDX grafts. RESULTS: We found that IDC-P was a prominent feature in the primary prostate specimens, present in 63% of specimens and often co-existing with poorly differentiated adenocarcinoma. Overall survival was similar in patients with or without IDC-P. In the PDXs from all seven patients, IDC-P was identified and present at a similar volume to adenocarcinoma. Residual IDC-P lesions persisted after host castration and, similar to castrate-tolerant adenocarcinoma, testosterone restoration led to tumour regeneration. CONCLUSION: The study showed that IDC-P is prevalent in aggressive prostate cancer and contains cells that can withstand androgen deprivation. Thus, IDC-P appears functionally relevant in advanced prostate cancer. The presence of IDC-P may be a trigger to develop innovative clinical management plans.


Assuntos
Antagonistas de Androgênios/uso terapêutico , Carcinoma Ductal/tratamento farmacológico , Neoplasias de Próstata Resistentes à Castração/tratamento farmacológico , Adenocarcinoma/patologia , Idoso , Idoso de 80 Anos ou mais , Animais , Carcinoma Ductal/patologia , Xenoenxertos/patologia , Humanos , Estimativa de Kaplan-Meier , Masculino , Camundongos Endogâmicos NOD , Camundongos SCID , Pessoa de Meia-Idade , Neoplasias de Próstata Resistentes à Castração/patologia , Estudos Retrospectivos , Transplante Heterólogo , Ensaios Antitumorais Modelo de Xenoenxerto/métodos
13.
Anticancer Agents Med Chem ; 18(7): 951-957, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-29141559

RESUMO

BACKGROUND: A recent surge in biomarkers to aid management of men with prostate cancer has occurred. Their applications are varied and not all tests are applicable to the active surveillance setting. OBJECTIVE: To review primary evidence on genetic and immunohistochemical biomarkers, and their role on patient selection and risk stratification for men on active surveillance for prostate cancer. EVIDENCE ACQUISITION: A PubMed electronic search using the terms (biomarker or genetic or histopathological) AND ("prostate cancer" AND "active surveillance") was performed from inception to April 2015. EVIDENCE SYNTHESIS: Of the biomarkers reviewed, Prostate Health Index (PHI) and Oncotype DX Genomic Prostate Score (GPS), were identified to currently hold greatest potential benefit to aid risk stratification of men for AS. Higher PHI, at baseline and during follow-up, was shown to predict pathological upgrading at rebiopsy at two single institutions, but with small cohorts (n<200). The Oncotype DX GPS test has been validated on men suitable for AS but having upfront radical prostatectomy. Increase in GPS was shown to predict upgrading and upstaging at radical prostatectomy and biochemical recurrence post radical prostatectomy. Prospective validation in AS cohorts is yet to be performed. CONCLUSIONS: PHI and Oncotype DX GPS show promise in aiding risk stratification for men on AS. However, larger prospective studies in AS cohorts are needed. Integration of biomarkers with existing clinical and imaging models remains a challenge.


Assuntos
Próstata/patologia , Neoplasias da Próstata/genética , Neoplasias da Próstata/patologia , Conduta Expectante/métodos , Antígenos de Neoplasias/genética , Biomarcadores Tumorais/análise , Biomarcadores Tumorais/genética , Progressão da Doença , Exossomos/genética , Exossomos/patologia , Regulação Neoplásica da Expressão Gênica , Humanos , Imuno-Histoquímica/métodos , Masculino , MicroRNAs/genética , Células Neoplásicas Circulantes/metabolismo , Células Neoplásicas Circulantes/patologia , Proteínas de Fusão Oncogênica/genética , Seleção de Pacientes , Prognóstico , Próstata/metabolismo , Neoplasias da Próstata/diagnóstico , Neoplasias da Próstata/epidemiologia , Medição de Risco
14.
BJU Int ; 119(4): 567-572, 2017 04.
Artigo em Inglês | MEDLINE | ID: mdl-27431748

RESUMO

OBJECTIVE: To evaluate the significance of routinely reported 'equivocal' lymphovascular invasion (LVI) in prostatectomy specimens of patients with clinically localized prostate cancer. MATERIALS AND METHODS: Prospectively collected data from men who underwent prostatectomy for clinically localized prostate cancer were retrospectively reviewed. Rates of adverse pathological features and biochemical recurrence (BCR) were compared between tumours positive, negative or 'equivocal' for LVI. Multivariable Cox regression analysis was performed to identify independent predictors of BCR. RESULTS: Of 1 310 consecutive cases, LVI was present definitively in 82 (6.3%) and equivocally in 43 (3.3%) cases. Similar to definitive LVI, equivocal LVI was significantly associated with other adverse pathological features, including advanced stage, higher Gleason grade and positive surgical margins. BCR occurred more frequently in patients with tumours that were equivocal (61%) or positive for LVI (71%) than in patients with negative results (14.7%). In addition, patients with both definitive and equivocal LVI had a significantly shorter BCR-free survival time compared with those with negative LVI. Multivariable Cox regression analysis indicated that the presence of either definitive or equivocal LVI were independent predictors of disease recurrence (hazard ratio [HR] 3.32, 95% confidence interval [CI] 2.3-4.8; P <0.001 vs HR 1.66, 95% CI 1.05-2.65; P = 0.032, respectively). CONCLUSION: In this single-institution study, equivocal LVI had a similar association with adverse pathological features and rate of BCR to that of definitive LVI. If our observations are validated in an independent cohort, consideration should be given to the inclusion of equivocal LVI as part of routine pathological reporting.


Assuntos
Linfonodos/patologia , Metástase Linfática , Invasividade Neoplásica/patologia , Recidiva Local de Neoplasia/patologia , Próstata/patologia , Prostatectomia , Neoplasias da Próstata/patologia , Neoplasias Vasculares/secundário , Humanos , Masculino , Pessoa de Meia-Idade , Recidiva Local de Neoplasia/sangue , Recidiva Local de Neoplasia/mortalidade , Prognóstico , Modelos de Riscos Proporcionais , Antígeno Prostático Específico/sangue , Neoplasias da Próstata/sangue , Neoplasias da Próstata/mortalidade , Estudos Retrospectivos , Neoplasias Vasculares/patologia
15.
Prostate ; 75(13): 1475-83, 2015 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-26177841

RESUMO

BACKGROUND: Fresh patient specimens of castrate-resistant prostate cancer (CRPC) are invaluable for studying tumor heterogeneity and responses to current treatments. They can be used for primary patient-derived xenografts (PDXs) or serially transplantable PDXs, but only a small proportion of samples grow successfully. To improve the efficiency and quality of PDXs, we investigated the factors that determine the initial engraftment of patient tissues derived from TURP specimens. METHODS: Fresh tissue was collected from castrate patients who required a TURP for urinary symptoms. Tissue was grafted under the renal capsule of immune-compromised mice for up to 14 weeks. The abundance of cancer in ungrafted and grafted specimens was compared using histopathology. Mice were castrated or implanted with testosterone pellets to determine the androgen-responsiveness of CRPC PDXs from TURP tissue. RESULTS: Primary PDXs were successfully established from 7 of 10 patients that underwent grafting. Of the 112 grafts generated from these 10 patients, 21% contained cancer at harvest. Grafts were most successful when the original patient specimens contained high amounts of viable cancer, defined as samples with (i) at least 50% cancer cells, (ii) no physical damage, and (iii) detectable Ki67 expression. PDX grafts survived in castrated hosts and proliferated in response to testosterone, confirming that they were castrate resistant but androgen-responsive. CONCLUSIONS: Primary PDXs of CRPC can be established from TURP specimens with modest success. The take rate can be increased if the original tissues contain sufficient numbers of actively proliferating cancer cells. Selecting specimens with abundant viable cancer will maximize the rate of engraftment and increase the efficiency of establishing PDXs that can be serially transplanted.


Assuntos
Xenoenxertos , Transplante de Neoplasias/métodos , Neoplasias da Próstata/patologia , Transplante Heterólogo/métodos , Idoso , Idoso de 80 Anos ou mais , Animais , Humanos , Masculino , Camundongos , Neoplasias da Próstata/cirurgia , Ressecção Transuretral da Próstata
16.
Biomaterials ; 34(20): 4777-85, 2013 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-23562048

RESUMO

Stromal-epithelial cell interactions play an important role in cancer and the tumor stroma is regarded as a therapeutic target. In vivo xenografting is commonly used to study cellular interactions not mimicked or quantified in conventional 2D culture systems. To interrogate the effects of tumor stroma (cancer-associated fibroblasts or CAFs) on epithelia, we created a bioengineered microenvironment using human prostatic tissues. Patient-matched CAFs and non-malignant prostatic fibroblasts (NPFs) from men with moderate (Gleason 7) and aggressive (Gleason 8-9 or castrate-resistant) prostate cancer were cultured with non-tumorigenic BPH-1 epithelial cells. Changes in the morphology, motility and phenotype of BPH-1 cells in response to CAFs and NPFs were analyzed using immunofluorescence and quantitative cell morphometric analyses. The matrix protein gene expression of CAFs, with proven tumorigenicity in vivo, had a significantly different gene expression profile of matrix proteins compared to patient matched NPFs. In co-culture with CAFs (but not NPFs), BPH-1 cells had a more invasive, elongated phenotype with increased motility and a more directed pattern of cell migration. CAFs from more aggressive tumors (Gleason 8-9 or CRPC) were not quantitatively different to moderate grade CAFs. Overall, our bioengineered microenvironment provides a novel 3D in vitro platform to systematically investigate the effects of tumor stroma on prostate cancer progression.


Assuntos
Bioengenharia/métodos , Transformação Celular Neoplásica/patologia , Fibroblastos/patologia , Neoplasias da Próstata/patologia , Microambiente Tumoral , Adulto , Idoso , Animais , Linhagem Celular Tumoral , Movimento Celular , Forma Celular , Técnicas de Cocultura , Progressão da Doença , Fibroblastos/metabolismo , Regulação Neoplásica da Expressão Gênica , Genes Neoplásicos/genética , Humanos , Masculino , Pessoa de Meia-Idade , Fenótipo , Hiperplasia Prostática/metabolismo , Hiperplasia Prostática/patologia , Neoplasias da Próstata/genética , Ratos , Ratos Sprague-Dawley , Células Estromais/patologia , Imagem com Lapso de Tempo
17.
Nat Protoc ; 8(5): 836-48, 2013 May.
Artigo em Inglês | MEDLINE | ID: mdl-23558784

RESUMO

Most cases of prostate cancer are now diagnosed as moderate-grade localized disease. These tumor specimens are important tools in the discovery and translation of prostate cancer research; however, unlike more advanced tumors, they are notoriously difficult to grow in the laboratory. We developed a system for efficiently xenografting localized human prostate cancer tissue, and we adapted this protocol to study the interactions between the specific subsets of epithelial and stromal cells. Fresh prostate tissues or isolated epithelial cells are recombined with mouse seminal vesicle mesenchyme (SVM) and grafted under the renal capsule of immunodeficient mice for optimum growth and survival. Alternatively, mouse mesenchyme can be replaced with human prostate fibroblasts in order to determine their contribution to tumor progression. Grafts can be grown for several months to determine the effectiveness of novel therapeutic compounds when administered to host mice, thereby paving the way for personalizing the treatment of individual prostate cancers.


Assuntos
Neoplasias da Próstata/patologia , Transplante Heterólogo/métodos , Ensaios Antitumorais Modelo de Xenoenxerto , Animais , Técnicas de Cultura de Células , Separação Celular/métodos , Técnicas de Cocultura , Avaliação Pré-Clínica de Medicamentos , Humanos , Rim/cirurgia , Masculino , Camundongos , Camundongos SCID , Glândulas Seminais/patologia
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...