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1.
Nature ; 606(7913): 335-342, 2022 06.
Artículo en Inglés | MEDLINE | ID: mdl-35650444

RESUMEN

Clonal expansions driven by somatic mutations become pervasive across human tissues with age, including in the haematopoietic system, where the phenomenon is termed clonal haematopoiesis1-4. The understanding of how and when clonal haematopoiesis develops, the factors that govern its behaviour, how it interacts with ageing and how these variables relate to malignant progression remains limited5,6. Here we track 697 clonal haematopoiesis clones from 385 individuals 55 years of age or older over a median of 13 years. We find that 92.4% of clones expanded at a stable exponential rate over the study period, with different mutations driving substantially different growth rates, ranging from 5% (DNMT3A and TP53) to more than 50% per year (SRSF2P95H). Growth rates of clones with the same mutation differed by approximately ±5% per year, proportionately affecting slow drivers more substantially. By combining our time-series data with phylogenetic analysis of 1,731 whole-genome sequences of haematopoietic colonies from 7 individuals from an older age group, we reveal distinct patterns of lifelong clonal behaviour. DNMT3A-mutant clones preferentially expanded early in life and displayed slower growth in old age, in the context of an increasingly competitive oligoclonal landscape. By contrast, splicing gene mutations drove expansion only later in life, whereas TET2-mutant clones emerged across all ages. Finally, we show that mutations driving faster clonal growth carry a higher risk of malignant progression. Our findings characterize the lifelong natural history of clonal haematopoiesis and give fundamental insights into the interactions between somatic mutation, ageing and clonal selection.


Asunto(s)
Hematopoyesis Clonal , Células Clonales , Anciano , Envejecimiento , Hematopoyesis Clonal/genética , Células Clonales/citología , Genoma Humano , Humanos , Estudios Longitudinales , Persona de Mediana Edad , Mutación , Filogenia
2.
Br J Dermatol ; 2024 Oct 11.
Artículo en Inglés | MEDLINE | ID: mdl-39392932

RESUMEN

BACKGROUND: Cutaneous leiomyosarcoma (cLMS) is a rare soft tissue neoplasm, showing smooth muscle differentiation, that arises from the mesenchymal cells of the dermis. To-date, genetic investigation of these tumours has involved studies with small sample sizes and limited analyses that identified recurrent somatic mutations in RB1 and TP53, copy number gain of MYCOD and IGF1R, and copy number loss of PTEN. OBJECTIVES: To better understand the molecular pathogenesis of cLMS, we comprehensively explored the mutational landscape of these rare tumours to identify candidate driver events. METHODS: In this retrospective, multi-institutional study, we performed whole-exome sequencing and RNA sequencing on 38 cases of cLMS. RESULTS: TP53 and RB1 were identified as significantly mutated, thus, represent validated driver genes of cLMS. COSMIC mutational signatures SBS7a/b and DBS1 were recurrent, thus, ultraviolet light exposure may be an aetiological factor driving cLMS. Analysis of significantly recurrent somatic copy number alterations, which represent candidate driver events, found focal (<10Mb) deletions encompassing TP53 and KDM6B, and amplifications encompassing ZMYM2, MYOCD, MAP2K4 and NCOR1. A larger (24 Mb) recurrent deletion encompassing CYLD was also identified as significant. Significantly recurrent broad copy number alterations, involving at least half of a chromosome arm, included deletions of 6p/q, 10p/q, 11q, 12q, 13q and 16p/q, and amplification of 15q. Notably PTEN is located on 10q, RB1 on 13q and IGFR1 on 15q. Fusion gene analysis identified recurrent CRTC1/3::MAML2 fusions, as well as many novel fusions in individual samples. CONCLUSIONS: Our analysis of the largest number of cLMS cases to-date highlights the importance of large cohort sizes and the exploration beyond small targeted gene panels when performing molecular analyses, as it allowed a comprehensive exploration of the mutational landscape of these tumours and identification of novel candidate driver events. It also uniquely afforded the opportunity to compare the molecular phenotype of cLMS with LMS of other tissue types, such as uterine and soft tissue LMS. Given that molecular profiling has resulted in the development of novel targeted treatment approaches for uterine and soft tissue LMS, our study now allows the same opportunities to become available for patients with cLMS.

3.
Nature ; 559(7714): 400-404, 2018 07.
Artículo en Inglés | MEDLINE | ID: mdl-29988082

RESUMEN

The incidence of acute myeloid leukaemia (AML) increases with age and mortality exceeds 90% when diagnosed after age 65. Most cases arise without any detectable early symptoms and patients usually present with the acute complications of bone marrow failure1. The onset of such de novo AML cases is typically preceded by the accumulation of somatic mutations in preleukaemic haematopoietic stem and progenitor cells (HSPCs) that undergo clonal expansion2,3. However, recurrent AML mutations also accumulate in HSPCs during ageing of healthy individuals who do not develop AML, a phenomenon referred to as age-related clonal haematopoiesis (ARCH)4-8. Here we use deep sequencing to analyse genes that are recurrently mutated in AML to distinguish between individuals who have a high risk of developing AML and those with benign ARCH. We analysed peripheral blood cells from 95 individuals that were obtained on average 6.3 years before AML diagnosis (pre-AML group), together with 414 unselected age- and gender-matched individuals (control group). Pre-AML cases were distinct from controls and had more mutations per sample, higher variant allele frequencies, indicating greater clonal expansion, and showed enrichment of mutations in specific genes. Genetic parameters were used to derive a model that accurately predicted AML-free survival; this model was validated in an independent cohort of 29 pre-AML cases and 262 controls. Because AML is rare, we also developed an AML predictive model using a large electronic health record database that identified individuals at greater risk. Collectively our findings provide proof-of-concept that it is possible to discriminate ARCH from pre-AML many years before malignant transformation. This could in future enable earlier detection and monitoring, and may help to inform intervention.


Asunto(s)
Predisposición Genética a la Enfermedad , Salud , Leucemia Mieloide Aguda/genética , Mutación , Adulto , Factores de Edad , Anciano , Progresión de la Enfermedad , Registros Electrónicos de Salud , Femenino , Humanos , Leucemia Mieloide Aguda/epidemiología , Leucemia Mieloide Aguda/patología , Masculino , Persona de Mediana Edad , Modelos Genéticos , Mutagénesis , Prevalencia , Medición de Riesgo
4.
J Appl Res Intellect Disabil ; 35(6): 1390-1402, 2022 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-36054256

RESUMEN

BACKGROUND: This study investigated if subjective socioeconomic status (SSS) is related to self-rated health (SRH) and objective indicators of health in people with and without intellectual disability. METHODS: Participants were 217 adults with, and 2350 adults without intellectual disability in Jersey. In the intellectual disability sample, 85 (39.2%) participants consented independently, while 132 (60.8%) participants consented through proxy procedures. The MacArthur Scale of Subjective Social Status was used to measure SSS. The Euro-Qol EQ-5D-5L and a five-point scale ranging from poor to excellent health were used to measure SRH. RESULTS: Higher SSS and younger age were predictors of better SRH for the proxy-report intellectual disability group. Being employed was associated with higher EQ-5D-5L index values for all intellectual disability groups. CONCLUSION: As SSS was only related to SRH in the proxy intellectual disability group, further research with a larger intellectual disability sample is needed to explore its utility further.


Asunto(s)
Discapacidad Intelectual , Adulto , Estado de Salud , Humanos , Discapacidad Intelectual/epidemiología , Apoderado , Calidad de Vida , Clase Social
5.
Gut ; 70(3): 544-554, 2021 03.
Artículo en Inglés | MEDLINE | ID: mdl-32690604

RESUMEN

OBJECTIVE: Complex phenotypes captured on histological slides represent the biological processes at play in individual cancers, but the link to underlying molecular classification has not been clarified or systematised. In colorectal cancer (CRC), histological grading is a poor predictor of disease progression, and consensus molecular subtypes (CMSs) cannot be distinguished without gene expression profiling. We hypothesise that image analysis is a cost-effective tool to associate complex features of tissue organisation with molecular and outcome data and to resolve unclassifiable or heterogeneous cases. In this study, we present an image-based approach to predict CRC CMS from standard H&E sections using deep learning. DESIGN: Training and evaluation of a neural network were performed using a total of n=1206 tissue sections with comprehensive multi-omic data from three independent datasets (training on FOCUS trial, n=278 patients; test on rectal cancer biopsies, GRAMPIAN cohort, n=144 patients; and The Cancer Genome Atlas (TCGA), n=430 patients). Ground truth CMS calls were ascertained by matching random forest and single sample predictions from CMS classifier. RESULTS: Image-based CMS (imCMS) accurately classified slides in unseen datasets from TCGA (n=431 slides, AUC)=0.84) and rectal cancer biopsies (n=265 slides, AUC=0.85). imCMS spatially resolved intratumoural heterogeneity and provided secondary calls correlating with bioinformatic prediction from molecular data. imCMS classified samples previously unclassifiable by RNA expression profiling, reproduced the expected correlations with genomic and epigenetic alterations and showed similar prognostic associations as transcriptomic CMS. CONCLUSION: This study shows that a prediction of RNA expression classifiers can be made from H&E images, opening the door to simple, cheap and reliable biological stratification within routine workflows.


Asunto(s)
Neoplasias Colorrectales/genética , Neoplasias Colorrectales/patología , Aprendizaje Profundo , Regulación Neoplásica de la Expresión Génica/genética , ARN/genética , Biomarcadores de Tumor/genética , Biopsia , Consenso , Conjuntos de Datos como Asunto , Progresión de la Enfermedad , Perfilación de la Expresión Génica , Humanos , Clasificación del Tumor , Fenotipo , Valor Predictivo de las Pruebas , Pronóstico
6.
Sociol Health Illn ; 41(2): 395-410, 2019 02.
Artículo en Inglés | MEDLINE | ID: mdl-30677163

RESUMEN

Given the considerable emphasis placed on informed choice, the management of health information has become an increasingly important part of living with chronic illness. This paper explores the intra-familial dynamics of managing health information in the context of chronic illness. Drawing on 77 interviews with people affected by Multiple Sclerosis in the UK (patients, partners, family members and close friends), we show how families develop their own idiosyncratic information practices, including the careful, at times strategic, seeking, sharing and withholding of information. We describe how one individual, most commonly either the patient or their partner, often takes primary responsibility for managing growing quantities of health information. Doing this is a complex task, yet its dynamics within the family unit remain invisible and unacknowledged. In this paper we: (a) stress the importance of understanding information management in chronic illness as a collective process across all those affected, patients as well as carers; (b) conceptualise the process of managing health information in this context as 'health information work'; and (c) analyse it as part of the wider care practices families engage in and as a form of care in its own right.


Asunto(s)
Cuidadores/psicología , Información de Salud al Consumidor/métodos , Familia/psicología , Conducta en la Búsqueda de Información , Esclerosis Múltiple , Adulto , Enfermedad Crónica/psicología , Femenino , Humanos , Internet , Masculino , Persona de Mediana Edad , Investigación Cualitativa , Apoyo Social
7.
Nature ; 469(7331): 539-42, 2011 Jan 27.
Artículo en Inglés | MEDLINE | ID: mdl-21248752

RESUMEN

The genetics of renal cancer is dominated by inactivation of the VHL tumour suppressor gene in clear cell carcinoma (ccRCC), the commonest histological subtype. A recent large-scale screen of ∼3,500 genes by PCR-based exon re-sequencing identified several new cancer genes in ccRCC including UTX (also known as KDM6A), JARID1C (also known as KDM5C) and SETD2 (ref. 2). These genes encode enzymes that demethylate (UTX, JARID1C) or methylate (SETD2) key lysine residues of histone H3. Modification of the methylation state of these lysine residues of histone H3 regulates chromatin structure and is implicated in transcriptional control. However, together these mutations are present in fewer than 15% of ccRCC, suggesting the existence of additional, currently unidentified cancer genes. Here, we have sequenced the protein coding exome in a series of primary ccRCC and report the identification of the SWI/SNF chromatin remodelling complex gene PBRM1 (ref. 4) as a second major ccRCC cancer gene, with truncating mutations in 41% (92/227) of cases. These data further elucidate the somatic genetic architecture of ccRCC and emphasize the marked contribution of aberrant chromatin biology.


Asunto(s)
Carcinoma de Células Renales/genética , Neoplasias Renales/genética , Mutación/genética , Proteínas Nucleares/genética , Proteínas Nucleares/metabolismo , Factores de Transcripción/genética , Factores de Transcripción/metabolismo , Animales , Línea Celular Tumoral , Proteínas de Unión al ADN , Modelos Animales de Enfermedad , Regulación de la Expresión Génica , Técnicas de Silenciamiento del Gen , Humanos , Ratones , Neoplasias Pancreáticas/genética
8.
Nature ; 463(7279): 360-3, 2010 Jan 21.
Artículo en Inglés | MEDLINE | ID: mdl-20054297

RESUMEN

Clear cell renal cell carcinoma (ccRCC) is the most common form of adult kidney cancer, characterized by the presence of inactivating mutations in the VHL gene in most cases, and by infrequent somatic mutations in known cancer genes. To determine further the genetics of ccRCC, we have sequenced 101 cases through 3,544 protein-coding genes. Here we report the identification of inactivating mutations in two genes encoding enzymes involved in histone modification-SETD2, a histone H3 lysine 36 methyltransferase, and JARID1C (also known as KDM5C), a histone H3 lysine 4 demethylase-as well as mutations in the histone H3 lysine 27 demethylase, UTX (KMD6A), that we recently reported. The results highlight the role of mutations in components of the chromatin modification machinery in human cancer. Furthermore, NF2 mutations were found in non-VHL mutated ccRCC, and several other probable cancer genes were identified. These results indicate that substantial genetic heterogeneity exists in a cancer type dominated by mutations in a single gene, and that systematic screens will be key to fully determining the somatic genetic architecture of cancer.


Asunto(s)
Carcinoma de Células Renales/genética , Genes de la Neurofibromatosis 2 , N-Metiltransferasa de Histona-Lisina/genética , Histonas/metabolismo , Neoplasias Renales/genética , Proteínas Nucleares/genética , Oxidorreductasas N-Desmetilantes/genética , Carcinoma de Células Renales/patología , Hipoxia de la Célula/genética , Cromatina/metabolismo , Regulación Neoplásica de la Expresión Génica , Histona Demetilasas , Humanos , Neoplasias Renales/patología , Mutación/genética , Análisis de Secuencia de ADN
9.
Nucleic Acids Res ; 42(18): 11517-27, 2014 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-25217585

RESUMEN

The Replication Stress Response (RSR) is a signaling network that recognizes challenges to DNA replication and coordinates diverse DNA repair and cell-cycle checkpoint pathways. Gemcitabine is a nucleoside analogue that causes cytotoxicity by inducing DNA replication blocks. Using a synthetic lethal screen of a RNAi library of nuclear enzymes to identify genes that when silenced cause gemcitabine sensitization or resistance in human triple-negative breast cancer cells, we identified NIMA (never in mitosis gene A)-related kinase 9 (NEK9) as a key component of the RSR. NEK9 depletion in cells leads to replication stress hypersensitivity, spontaneous accumulation of DNA damage and RPA70 foci, and an impairment in recovery from replication arrest. NEK9 protein levels also increase in response to replication stress. NEK9 complexes with CHK1, and moreover, NEK9 depletion impairs CHK1 autophosphorylation and kinase activity in response to replication stress. Thus, NEK9 is a critical component of the RSR that promotes CHK1 activity, maintaining genome integrity following challenges to DNA replication.


Asunto(s)
Antimetabolitos Antineoplásicos/farmacología , Replicación del ADN , Desoxicitidina/análogos & derivados , Proteínas Serina-Treonina Quinasas/fisiología , Estrés Fisiológico/genética , Línea Celular Tumoral , Quinasa 1 Reguladora del Ciclo Celular (Checkpoint 1) , Daño del ADN , Desoxicitidina/farmacología , Femenino , Humanos , Quinasas Relacionadas con NIMA , Proteínas Quinasas/metabolismo , Proteínas Serina-Treonina Quinasas/genética , Proteínas Serina-Treonina Quinasas/metabolismo , Proteína de Replicación A/análisis , Neoplasias de la Mama Triple Negativas/genética , Gemcitabina
10.
Appetite ; 99: 200-210, 2016 Apr 01.
Artículo en Inglés | MEDLINE | ID: mdl-26792772

RESUMEN

The internet has become an increasingly important way of communicating with consumers about food risk information. However, relatively little is known about how consumers evaluate and come to trust the information they encounter online. Using the example of unpasteurized or raw milk this paper presents two studies exploring the trust factors associated with online information about the risks and benefits of raw milk consumption. In the first study, eye-tracking data was collected from 33 pasteurised milk consumers whilst they viewed six different milk related websites. A descriptive analysis of the eye-tracking data was conducted to explore viewing patterns. Reports revealed the importance of images as a way of capturing initial attention and foregrounding other features and highlighted the significance of introductory text within a homepage. In the second, qualitative study, 41 consumers, some of whom drank raw milk, viewed a selection of milk related websites before participating in either a group discussion or interview. Seventeen of the participants also took part in a follow up telephone interview 2 weeks later. The qualitative data supports the importance of good design whilst noting that balance, authorship agenda, the nature of evidence and personal relevance were also key factors affecting consumers trust judgements. The results of both studies provide support for a staged approach to online trust in which consumers engage in a more rapid, heuristic assessment of a site before moving on to a more in-depth evaluation of the information available. Findings are discussed in relation to the development of trustworthy online food safety resources.


Asunto(s)
Comportamiento del Consumidor , Inocuidad de los Alimentos , Internet , Leche , Pasteurización , Confianza/psicología , Adolescente , Adulto , Animales , Bases de Datos Factuales , Femenino , Estudios de Seguimiento , Contaminación de Alimentos , Microbiología de Alimentos , Humanos , Conducta en la Búsqueda de Información , Masculino , Persona de Mediana Edad , Leche/microbiología , Factores de Riesgo , Encuestas y Cuestionarios , Adulto Joven
11.
Proc Natl Acad Sci U S A ; 110(33): 13546-51, 2013 Aug 13.
Artículo en Inglés | MEDLINE | ID: mdl-23898190

RESUMEN

Sirtuin 2 (SIRT2) is a sirtuin family deacetylase that directs acetylome signaling, protects genome integrity, and is a murine tumor suppressor. We show that SIRT2 directs replication stress responses by regulating the activity of cyclin-dependent kinase 9 (CDK9), a protein required for recovery from replication arrest. SIRT2 deficiency results in replication stress sensitivity, impairment in recovery from replication arrest, spontaneous accumulation of replication protein A to foci and chromatin, and a G2/M checkpoint deficit. SIRT2 interacts with and deacetylates CDK9 at lysine 48 in response to replication stress in a manner that is partially dependent on ataxia telangiectasia and Rad3 related (ATR) but not cyclin T or K, thereby stimulating CDK9 kinase activity and promoting recovery from replication arrest. Moreover, wild-type, but not acetylated CDK9, alleviates the replication stress response impairment of SIRT2 deficiency. Collectively, our results define a function for SIRT2 in regulating checkpoint pathways that respond to replication stress through deacetylation of CDK9, providing insight into how SIRT2 maintains genome integrity and a unique mechanism by which SIRT2 may function, at least in part, as a tumor suppressor protein.


Asunto(s)
Puntos de Control del Ciclo Celular/fisiología , Quinasa 9 Dependiente de la Ciclina/metabolismo , Replicación del ADN/fisiología , Sirtuina 2/metabolismo , Acetilación , Animales , Western Blotting , Línea Celular , Cromatografía Liquida , Ensayo de Unidades Formadoras de Colonias , Técnica del Anticuerpo Fluorescente , Humanos , Ratones , Proteína de Replicación A/metabolismo , Espectrometría de Masas en Tándem
12.
Blood ; 122(22): 3616-27; quiz 3699, 2013 Nov 21.
Artículo en Inglés | MEDLINE | ID: mdl-24030381

RESUMEN

Myelodysplastic syndromes (MDS) are a heterogeneous group of chronic hematological malignancies characterized by dysplasia, ineffective hematopoiesis and a variable risk of progression to acute myeloid leukemia. Sequencing of MDS genomes has identified mutations in genes implicated in RNA splicing, DNA modification, chromatin regulation, and cell signaling. We sequenced 111 genes across 738 patients with MDS or closely related neoplasms (including chronic myelomonocytic leukemia and MDS-myeloproliferative neoplasms) to explore the role of acquired mutations in MDS biology and clinical phenotype. Seventy-eight percent of patients had 1 or more oncogenic mutations. We identify complex patterns of pairwise association between genes, indicative of epistatic interactions involving components of the spliceosome machinery and epigenetic modifiers. Coupled with inferences on subclonal mutations, these data suggest a hypothesis of genetic "predestination," in which early driver mutations, typically affecting genes involved in RNA splicing, dictate future trajectories of disease evolution with distinct clinical phenotypes. Driver mutations had equivalent prognostic significance, whether clonal or subclonal, and leukemia-free survival deteriorated steadily as numbers of driver mutations increased. Thus, analysis of oncogenic mutations in large, well-characterized cohorts of patients illustrates the interconnections between the cancer genome and disease biology, with considerable potential for clinical application.


Asunto(s)
Mutación , Síndromes Mielodisplásicos/genética , Anciano , Anciano de 80 o más Años , Estudios de Cohortes , Progresión de la Enfermedad , Epistasis Genética , Femenino , Humanos , Leucemia Mieloide Aguda/genética , Leucemia Mielomonocítica Crónica/genética , Masculino , Persona de Mediana Edad , Enfermedades Mielodisplásicas-Mieloproliferativas/genética , Oncogenes , Pronóstico , Empalme del ARN/genética , Empalmosomas/genética
13.
Prev Vet Med ; 233: 106332, 2024 Sep 05.
Artículo en Inglés | MEDLINE | ID: mdl-39260024

RESUMEN

Sheep scab causes economic losses and animal welfare problems and has proven difficult to control in the UK. Research has highlighted the importance of developing place-based approaches to understanding and controlling sheep scab. This paper builds on this literature through introducing the concept of marginality in the case study of managing sheep scab on the island of Lewis and Harris in the Scottish Western Isles. The paper also proposes steps for developing a place-based understanding of biosecurity. The research draws on interviews and workshops with crofters analysed using thematic analysis. Crofting is a unique system of land management particular to Scotland. Crofters have the right to manage a small area of private land and access to a larger area of common grazing. The research found that there was a tension between the cultural heritage and social benefits of traditional crofting practices of common grazing and communal husbandry of sheep and the biosecurity imperative to reduce the mixing of sheep to prevent the spread of disease. Dynamics of marginalisation were also disrupting established husbandry practices through a lack of people and loss of sheep from the land. The crofters also identified collective actions they could take to tackle sheep scab, including collective dipping and controlling the movement of animals onto the island. Previous research has shown that in marginalised areas, social capital: networks between people, are not a panacea for bringing about positive change and additional resources from outside may be needed. Based on the findings of this research we suggest three phases for developing a place-based conception of biosecurity for livestock keepers. The first phase is to understand both the biosecurity challenges facing communities and cultural and social aspects of farming systems that are important to a region. The second is to facilitate livestock keepers to co-produce their own priorities for biosecurity that allow them to address disease management challenges in their own constraints. The third phase is to enable communities to implement measures in their context. This can involve facilitating access to potential financial resources, equipment, expertise and links with other community groups. These phases will facilitate them in developing their definition of place-based biosecurity. This paper addresses the first and preliminary research on the second stages of this process. Further research will lead to actions on the third phase to help crofters in Lewis and Harris to put a place based communal understanding of biosecurity into practice.

14.
Br J Radiol ; 97(1153): 21-30, 2024 Jan 23.
Artículo en Inglés | MEDLINE | ID: mdl-38263828

RESUMEN

Many different malignancies occur in children, but overall, cancer in childhood is rare. Survival rates have improved appreciably and are higher compared with most adult tumour types. Treatment schedules evolve as a result of clinical trials and are typically complex and multi-modality, with radiotherapy an integral component of many. Risk stratification in paediatric oncology is increasingly refined, resulting in a more personalized use of radiation. Every available modality of radiation delivery: simple and advanced photon techniques, proton beam therapy, molecular radiotherapy, and brachytherapy, have their place in the treatment of children's cancers. Radiotherapy is rarely the sole treatment. As local therapy, it is often given before or after surgery, so the involvement of the surgeon is critically important, particularly when brachytherapy is used. Systemic treatment is the standard of care for most paediatric tumour types, concomitant administration of chemotherapy is typical, and immunotherapy has an increasing role. Delivery of radiotherapy is not done by clinical or radiation oncologists alone; play specialists and anaesthetists are required, together with mould room staff, to ensure compliance and immobilization. The support of clinical radiologists is needed to ensure the correct interpretation of imaging for target volume delineation. Physicists and dosimetrists ensure the optimal dose distribution, minimizing exposure of organs at risk. Paediatric oncology doctors, nurses, and a range of allied health professionals are needed for the holistic wrap-around care of the child and family. Radiographers are essential at every step of the way. With increasing complexity comes a need for greater centralization of services.


Asunto(s)
Braquiterapia , Neoplasias , Oncología por Radiación , Adulto , Humanos , Niño , Oncología Médica , Reino Unido
15.
Cancer ; 119(12): 2350-7, 2013 Jun 15.
Artículo en Inglés | MEDLINE | ID: mdl-23625519

RESUMEN

BACKGROUND: Adjuvant radiotherapy (A-RT) for patients with resected pancreatic adenocarcinoma (PAC) is controversial. In the current study, the authors aim to determine whether there is an association between overall survival (OS) and A-RT dose. METHODS: National Cancer Data Base (NCDB) data were obtained for all patients who received A-RT for resected PAC from 1998 through 2002. Univariate and multivariate survival analyses were performed along with Kaplan-Meier estimates for A-RT levels < 40 grays (Gy), 40 Gy to < 50 Gy, 50 Gy to < 55 Gy, and ≥ 55 Gy. RESULTS: A total of 1385 patients met the inclusion criteria. The median age of the patients was 64 years (range, 29 years-87 years). All patients underwent surgical resection and A-RT with or without chemotherapy. A total of 231 patients were diagnosed with stage I disease, 273 were diagnosed with stage II disease, 734 were diagnosed with stage III disease, and 126 were diagnosed with stage IVA disease (according to the fifth edition of the American Joint Committee on Cancer); 21 were found to have an unknown stage of disease. The median A-RT dose was 45 Gy (range, 1.63 Gy-69 Gy). The median OS was 21 months (95% confidence interval [95% CI], 19 months-23 months). On multivariate analysis, an A-RT dose < 40 Gy (hazards ratio [HR], 1.30 [95% CI, 1.03-1.66]; P = .031), an A-RT dose of 40 Gy to < 50 Gy (HR, 1.17 [95% CI, 1.00-1.37]; P = .05), and an A-RT dose ≥ 55 Gy (HR, 1.44 [95% CI, 1.08-1.93]; P = .013) predicted worse OS compared with the reference category of 50 Gy to < 55 Gy. CONCLUSIONS: A-RT doses of < 40 Gy, 40 Gy to < 50 Gy, and ≥ 55 Gy were found to be associated with an inferior OS. The dose of A-RT delivered appears to influence OS and a prospective study evaluating the addition of optimally delivered A-RT for patients with resected PAC is needed.


Asunto(s)
Adenocarcinoma/mortalidad , Adenocarcinoma/radioterapia , Adenocarcinoma/cirugía , Neoplasias Pancreáticas/mortalidad , Neoplasias Pancreáticas/radioterapia , Neoplasias Pancreáticas/cirugía , Adulto , Anciano , Anciano de 80 o más Años , Femenino , Humanos , Masculino , Persona de Mediana Edad , Dosificación Radioterapéutica , Radioterapia Adyuvante , Estados Unidos
16.
Cancer ; 119(17): 3148-55, 2013 Sep 01.
Artículo en Inglés | MEDLINE | ID: mdl-23720157

RESUMEN

BACKGROUND: Mixed lineage kinase domain-like protein (MLKL) is a necrosome component mediating programmed necrosis that may be an important determinant of cancer cell death. The goal of the current study was to evaluate the prognostic value of MLKL expression in patients with pancreatic adenocarcinoma (PAC). METHODS: Tissue from 80 patients was collected from a prospectively maintained database of patients with PAC who underwent pancreaticoduodenectomy between January 2000 and October 2008. Immunohistochemistry analysis was performed and scored using an established scoring system. Kaplan-Meier survival curves were generated for recurrence-free survival (RFS) and overall survival (OS) for all patients and for patients receiving adjuvant chemotherapy. MLKL scores were correlated with RFS and OS using univariate and multivariate Cox regression analyses incorporating clinically relevant covariates. RESULTS: The median age of the patients was 63 years and 53% were men. Low MLKL expression was associated with decreased OS (6 months vs 17 months; P = .006). In the subset of 59 patients who received adjuvant chemotherapy, low MLKL expression was associated with decreased RFS (5 months vs 15 months; P = .006) and decreased OS (6 months vs 19 months; P < .0001). On multivariate analysis, low MLKL expression was associated with poor OS in all patients (hazards ratio, 4.6 [95% confidence interval, 1.6-13.8]; P = .006) and in patients receiving adjuvant chemotherapy (hazards ratio, 8.1 [95% confidence interval, 2.2-29.2]; P = .002). CONCLUSIONS: Low expression of MLKL is associated with decreased OS in patients with resected PAC and decreased RFS and OS in the subset of patients with resected PAC who receive adjuvant chemotherapy. The use of this biomarker in patients with PAC may provide important prognostic information.


Asunto(s)
Adenocarcinoma/enzimología , Adenocarcinoma/patología , Biomarcadores de Tumor/análisis , Neoplasias Pancreáticas/enzimología , Neoplasias Pancreáticas/patología , Proteínas Quinasas/análisis , Adulto , Anciano , Anciano de 80 o más Años , Análisis de Varianza , Femenino , Regulación Enzimológica de la Expresión Génica , Regulación Neoplásica de la Expresión Génica , Humanos , Inmunohistoquímica , Estimación de Kaplan-Meier , Masculino , Persona de Mediana Edad , Estadificación de Neoplasias , Oportunidad Relativa , Valor Predictivo de las Pruebas , Pronóstico , Modelos de Riesgos Proporcionales
17.
Maturitas ; 177: 107806, 2023 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-37536172

RESUMEN

This study explored the use of Twitter to communicate about menopause. Tweets in English posted between January 2014 and December 2022 with the hashtag "menopause" were extracted. Total global tweets and those from the UK, USA, Australia and Canada were examined. Globally, there were 314,974 tweets about menopause over this period, with an annual average of 34,997. There were notable differences between countries, with a large increase in use in the UK in 2018 and 2019, a reducing trend in use in the USA with a smaller increase in 2018 and 2019, and low stable usage in Australia and Canada.


Asunto(s)
Medios de Comunicación Sociales , Femenino , Humanos , Comunicación , Australia , Canadá , Menopausia
18.
ACS Omega ; 8(23): 20589-20610, 2023 Jun 13.
Artículo en Inglés | MEDLINE | ID: mdl-37323395

RESUMEN

The complete simulation model of an existing 1 kW high-temperature proton exchange membrane (HT-PEM) fuel cell-based residential micro-combined heat-and-power process, including a compact intensified heat-exchanger-reactor, is developed in the simulation software ProSimPlus v3.6.16. Detailed simulation models of the heat-exchanger-reactor, a mathematical model of the HT-PEM fuel cell, and other components are presented. The results obtained by the simulation model and by the experimental micro-cogenerator are compared and discussed. To fully understand the behavior of the integrated system and assess its flexibility, a parametric study is performed considering fuel partialization and important operating parameters. The values of the air-to-fuel ratio = [30, 7.5] and steam-to-carbon ratio = 3.5 (corresponding to net electrical and thermal efficiencies of 21.5 and 71.4%) are chosen for the analysis of inlet/outlet component temperatures. Finally, the exchange network analysis of the full process proves that the process efficiencies can still be increased by further improving the process internal heat integration.

19.
Cancer Cell ; 41(2): 288-303.e6, 2023 02 13.
Artículo en Inglés | MEDLINE | ID: mdl-36669486

RESUMEN

Interferon-γ (IFN-γ) signaling mediates host responses to infection, inflammation and anti-tumor immunity. Mutations in the IFN-γ signaling pathway cause immunological disorders, hematological malignancies, and resistance to immune checkpoint blockade (ICB) in cancer; however, the function of most clinically observed variants remains unknown. Here, we systematically investigate the genetic determinants of IFN-γ response in colorectal cancer cells using CRISPR-Cas9 screens and base editing mutagenesis. Deep mutagenesis of JAK1 with cytidine and adenine base editors, combined with pathway-wide screens, reveal loss-of-function and gain-of-function mutations, including causal variants in hematological malignancies and mutations detected in patients refractory to ICB. We functionally validate variants of uncertain significance in primary tumor organoids, where engineering missense mutations in JAK1 enhanced or reduced sensitivity to autologous tumor-reactive T cells. We identify more than 300 predicted missense mutations altering IFN-γ pathway activity, generating a valuable resource for interpreting gene variant function.


Asunto(s)
Neoplasias Hematológicas , Neoplasias , Humanos , Interferón gamma/genética , Interferón gamma/metabolismo , Edición Génica , Neoplasias/genética , Mutación , Transducción de Señal/genética , Sistemas CRISPR-Cas
20.
Maturitas ; 158: 70-77, 2022 04.
Artículo en Inglés | MEDLINE | ID: mdl-35115178

RESUMEN

INTRODUCTION: The menopause, or the cessation of menstruation, is a stage of the life cycle which will occur in all women. Managing perimenopausal and postmenopausal health is a key issue for all areas of healthcare, not just gynecology. AIM: To provide recommendations for the curriculum of education programs for healthcare professionals worldwide, so that all can receive high quality training on menopause. MATERIALS AND METHODS: Literature review and consensus of expert opinion. SUMMARY RECOMMENDATIONS: Training programs for healthcare professionals worldwide should include menopause and postmenopausal health in their curriculum. It should include assessment, diagnosis and evidence-based management strategies.


Asunto(s)
Curriculum , Personal de Salud , Menopausia , Consenso , Europa (Continente) , Femenino , Personal de Salud/educación , Humanos , Sociedades Médicas
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