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1.
Br J Cancer ; 123(5): 722-729, 2020 09.
Artículo en Inglés | MEDLINE | ID: mdl-32624574

RESUMEN

BACKGROUND: Patients with non-specific symptoms often experience longer times to diagnosis and poorer clinical outcomes than those with site-specific symptoms. This paper reports initial results from five multidisciplinary diagnostic centre (MDC) projects in England, piloting rapid referral for patients with non-specific symptoms. METHODS: The evaluation covered MDC activity from 1st December 2016 to 31st July 2018, with projects using a common dataset. Logistical regression analyses were conducted, with a diagnosis of any cancer as the dependent variable. Exploratory analysis was conducted on presenting symptoms and diagnoses of cancer, and on comparisons within these groupings. RESULTS: In total, 2961 patients were referred into the MDCs and 241 cancers were diagnosed. The pathway detected cancers across a broad range of tumour sites, including several rare and less common cancers. An association between patient age and cancer was identified (p < 0.001). GP 'clinical suspicion' was identified as a strong predictor of cancer (p = 0.006), with a reduced association with cancer observed in patients with higher numbers of GP consultation before referral (p = 0.008). CONCLUSIONS: The MDC model diagnoses cancer in patients with non-specific symptoms, with a conversion rate of 8%, demonstrating the diagnostic potential of a non-site-specific symptomatic referral pathway.


Asunto(s)
Neoplasias/diagnóstico , Adulto , Anciano , Anciano de 80 o más Años , Detección Precoz del Cáncer/métodos , Femenino , Humanos , Comunicación Interdisciplinaria , Masculino , Persona de Mediana Edad , Grupo de Atención al Paciente , Derivación y Consulta
2.
J Public Health (Oxf) ; 36(1): 140-8, 2014 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-23554510

RESUMEN

BACKGROUND: Increasing incidence of and mortality from skin cancer are posing a large financial burden on the NHS in England. Information provided by cost-of-illness (CoI) studies are used in policy making and are particularly useful for measuring the potential savings from averting a case of disease. METHODS: We estimate the cost of skin cancer in England, and model future costs up to 2020. We compare two costing approaches (top-down and bottom-up). RESULTS: We estimate that costs due to skin cancer were in the range of £106-£112 million in 2008. These figures are very closely related to those provided by the Department of Health (estimated to be £104.0 million in 2007-8 and £105.2 million 2008-9). The expected cost per case of malignant melanoma was estimated to be £2607 and £2560, using the bottom-up and top-down approaches, respectively. The mean cost per case of non-melanoma skin cancer was £889 and £1226, respectively. We estimate that the cost to the NHS due to skin cancer will amount to over £180 million in 2020. CONCLUSION: Effective prevention of skin cancer might not only reduce a significant burden of disease but it could also save considerable resources to the NHS.


Asunto(s)
Costos de la Atención en Salud/estadística & datos numéricos , Neoplasias Cutáneas/economía , Costo de Enfermedad , Inglaterra/epidemiología , Predicción , Costos de la Atención en Salud/tendencias , Humanos , Neoplasias Cutáneas/epidemiología
3.
J Small Anim Pract ; 62(8): 704-708, 2021 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-32935335

RESUMEN

This report describes two cases of feline anal sac squamous cell carcinoma. Cat 1 was managed with a multimodal approach combining surgical resection, radiation therapy and systemic therapy (toceranib phosphate; Palladia™) until local recurrence was identified at 236 days postsurgery. At that time, the cat received carboplatin. With the tumour being progressive, the cat was euthanased 552 days post initial surgery. Cat 2 was managed palliatively with a non-steroidal anti-inflammatory (meloxicam) and supportive medications. Unfortunately, with further decline in quality of life following initial diagnosis, the cat was euthanased 28 days later. Squamous cell carcinoma should be considered as a possible differential diagnosis when a cat is presented for investigation of an anal sac mass.


Asunto(s)
Sacos Anales , Carcinoma de Células Escamosas , Enfermedades de los Gatos , Animales , Carcinoma de Células Escamosas/tratamiento farmacológico , Carcinoma de Células Escamosas/veterinaria , Enfermedades de los Gatos/terapia , Gatos , Diagnóstico Diferencial , Recurrencia Local de Neoplasia/veterinaria , Calidad de Vida
4.
Prev Vet Med ; 175: 104868, 2020 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-31869580

RESUMEN

In the French bovine tuberculosis (bTB) surveillance program, tracing-on and back investigations have a major importance as, in 2016, they represented about 21 % of the detected outbreaks. Building on our previous work on the other surveillance system components (Poirier et al., 2019), we evaluated for the first time the sensitivity and the cost of the two existing protocols of bTB's tracing-on investigations trough scenario tree modelling with a stochastic approach. We used French databases (national database for bovine identification and database recording all bTB surveillance and control results) and direct and indirect costs collected in a previous study. These assessments allowed us to calculate the cost-effectiveness index (cost/sensitivity) of each tracing-on protocol. In the first protocol (trace-and-cull protocol), the animal(s) linking the farm to an outbreak are systematically culled for bacteriology, PCR and histology testing. In the second protocol (trace-and-test protocol), the traced animal is culled only if it had non-negative result to an intradermal cervical comparative tuberculin test (ICCT). We estimated herd sensitivity of the two tracing-on protocols for 12 herd types defined by their production type, size and herd turnover. For the trace-and-cull protocol, mean herd sensitivity was estimated between 67.3 % [66.8-67.7]CI95 % and 89.2 % [88.7-89.7]CI95 % and between 51.2 % [50.8-51.5]CI95 % and 73.1 % [72.6-73.6]CI95 % for the trace-and-test protocol, depending on herd type. The trace-and-cull protocol was between 278 €/herd and 717 €/herd more expensive than the trace-and-test protocol, depending on herd type. Regardless of herd type, the trace-and-cull protocol had the smaller cost/sensitivity ratio and was therefore the most cost-effective protocol. That work showed that systematically culling traced animals to perform bacteriology and PCR on them (trace-and-cull protocol) is associated with a better herd sensitivity and is more cost-effective for all herd types. That is consistent with French veterinary authorities' recommendations but does not account for sociological aspects such as the bond between the farmer and his animals. Yet, cost-effectiveness difference was minor in small dairy and beef herds with a low turnover, suggesting the protocol could be chosen depending on the epidemiological context in those herds.


Asunto(s)
Trazado de Contacto/veterinaria , Análisis Costo-Beneficio , Brotes de Enfermedades/veterinaria , Tuberculosis Bovina/transmisión , Animales , Bovinos , Trazado de Contacto/economía , Trazado de Contacto/métodos , Femenino , Francia
5.
Res Vet Sci ; 132: 546-562, 2020 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-32829191

RESUMEN

Periodic screening in farms, using intradermal cervical comparative tuberculin test (ICCT), is a component of the French ante mortem surveillance of bovine tuberculosis (bTB). Previous studies have estimated the cost-effectiveness of the French mandatory bTB screening protocols. In these protocols, a second ICCT (ICCT2) is performed 42 days after the first one (ICCT1), either on the entire herd (strict protocol) or in series on animals with non-negative results (reactors) to ICCT1 (compliant protocol). The 42-days interval reduced protocols' cost-effectiveness. To minimize this interval, we suggested two alternative protocols, in which a mixed interferon gamma test (IFNMIX), with better sensitivity than ICCT2 and comparable specificity, replaces the ICCT2, and is carried out directly after the ICCT1. In the strict alternative protocol, reactors to ICCT1 are culled to perform laboratory analyses (PCR, bacteriology). Negative results to these analyses imply the IFNMIX testing of the entire herd. In the compliant alternative protocol, only reactor(s) to ICCT1 are tested with IFNMIX, and animals with positive results to IFNMIX are culled for laboratory analyses. We evaluated these protocols through scenario tree modelling. The estimated cost-effectiveness indexes showed that the compliant alternative protocol was the most efficient. The strict protocols (mandatory and alternative) were never the most efficient, but were the most effective. Therefore, using IFNMIX instead of ICCT2 may be useful in reducing the costs of the compliant protocol used when the probability of infection is considered low. The strict alternative protocol may become more attractive would IFNMIX's price decreased.


Asunto(s)
Análisis Costo-Beneficio , Interferón gamma , Prueba de Tuberculina/veterinaria , Tuberculosis Bovina/diagnóstico , Animales , Bovinos , Francia/epidemiología , Pruebas Intradérmicas/veterinaria , Mycobacterium bovis , Vigilancia de la Población , Tuberculina , Tuberculosis Bovina/epidemiología
6.
Res Vet Sci ; 128: 242-260, 2020 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-31837513

RESUMEN

Disease surveillance systems' effectiveness relies on participants following prescribed practices. We developed a general method to improve a previous cost-effectiveness evaluation of three French screening program protocols for bovine tuberculosis (bTB) to account for the practices of participants by scenario tree modelling. This method relies on: 1) semi-directive interviews of participants to identify the variability of practices and potentially influential factors, and to understand the sociological context; 2) a quantitative survey, based on multiple-choice questions, to quantify various practices and identify significantly influential factors by multivariable regression analyses; 3) addition of the scenario-tree nodes corresponding to the practices and their influential factors and configuration of the new limbs according to the data of the quantitative survey. We used this approach to integrate data concerning veterinary practices and identify some failures to conform to regulatory guidelines regarding intradermal cervical comparative tuberculin test (SICCT) (testing and notification of non-negative results). Such nonconformities appeared to be mainly caused by cattle restraint issues and the perception of veterinarians of the bTB control program. Indeed, their perception of that program significantly influenced veterinarians' practices. We modelled the influence of the SICCT practices on the SICCT results. The incorporation of these data led to a major decrease of the herd sensitivity estimations relative to the previous assessments that did not incorporate data of practices (15% to 42% decrease). This result shows the important impact of veterinarians' practices and their influencing factors (such as perception of the bTB control program) on the effectiveness of the surveillance system.


Asunto(s)
Monitoreo Epidemiológico/veterinaria , Prueba de Tuberculina/veterinaria , Tuberculosis Bovina , Animales , Bovinos , Análisis Costo-Beneficio , Granjas , Francia , Pruebas Intradérmicas , Guías de Práctica Clínica como Asunto , Administración de la Práctica Veterinaria , Encuestas y Cuestionarios , Tuberculosis Bovina/diagnóstico , Tuberculosis Bovina/epidemiología
7.
Prev Vet Med ; 166: 93-109, 2019 May 01.
Artículo en Inglés | MEDLINE | ID: mdl-30935511

RESUMEN

In most officially bovine tuberculosis (bTB)-free countries, bTB has not been fully eradicated. Costly and time-consuming surveillance and control measures are therefore still in place to control this infection. An officially bTB-free status, both at the national and at the herd level, influences whether and when animals can be sold. Thus, this infection is still an economic issue, justifying measures towards its eradication. An evaluation of the cost-effectiveness of such measures would be highly useful, especially to optimise the costs of control measures and their adaptation to a local epidemiological context. We evaluated the cost-effectiveness of three mandatory surveillance protocols currently used in France by herd type (type of production, size, and turnover of the herd) under French field conditions. The first protocol ("strict") implies the direct slaughter and post-mortem analyses of any intradermal cervical tuberculin test (ICT) reactor, and negative results to a second intradermal cervical comparative tuberculin test (ICCT) to regain bTB-free status of the herd. In the second protocol ("compliant quick-path") bTB-free status can be regain if post-mortem analyses of reactors to the first ICT are negative. In the third protocol ("compliant slow-path"), ICCT-reactive animals are tested using the interferon gamma assay; the results of this test influence the path of further investigation. We built scenario trees for each of these protocols at the animal level. They allowed us to estimate herd sensitivity and the total cost of each protocol by herd type. The protocols could be ordered by decreasing herd sensitivity and cost, regardless of the herd type, as follows: strict protocol, compliant quick-path protocol, and compliant slow-path protocol. We calculated a cost-effectiveness index to evaluate the cost-effectiveness of each protocol. The strict protocol was never the most cost-effective, regardless of herd type, due to higher costs relative to the other protocols, despite better herd sensitivity. We found the compliant quick-path to be the most cost-effective protocol for big beef, big dairy, and mixed herds. The compliant slow-path was the most cost-effective for small-scale beef and dairy herds. All differences were significant. This comparison of the cost-effectiveness of the protocols by herd type could help authorities to choose the most suitable protocol in the investigation of suspected cases, depending on the herd type, but could be improved by accounting for important sociological data, such as the acceptability of the protocols.


Asunto(s)
Análisis Costo-Beneficio , Vigilancia de Guardia/veterinaria , Prueba de Tuberculina/economía , Tuberculosis Bovina/epidemiología , Animales , Bovinos , Francia/epidemiología , Mycobacterium bovis/aislamiento & purificación , Vigilancia de la Población/métodos , Prevalencia , Prueba de Tuberculina/métodos , Tuberculosis Bovina/microbiología
8.
J Small Anim Pract ; 60(6): 379-383, 2019 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-30478900

RESUMEN

OBJECTIVES: To assess healing of the canine lower eyelid without anatomical reconstruction. MATERIALS AND METHODS: Retrospective case series of three client-owned dogs with lower eyelid defects. These dogs that underwent debridement of lower eyelid wounds that were left to heal by secondary intention were assessed for anatomical, functional and aesthetic outcomes. RESULTS: Two of the cases had previously undergone tumour resection with a lip-to-lid reconstruction and, following flap failure, developed a full thickness defect. The third dog presented with a traumatic laceration. Each dog lost approximately 70 to 90% of the lower eyelid margin. Two received topical antimicrobial eye drops after debridement, while the third dog required no further treatment. Follow-up periods of 3 years, 15 months and 4 months were available. All owners were satisfied with the cosmetic outcome and provided pictures. One owner reported epiphora but no other ophthalmic complications occurred. CLINICAL SIGNIFICANCE: The result of this small case series supports the notion that not all lower eyelid injuries or tumour resections require anatomical reconstruction. Selected cases can be left to heal by secondary intention with minimal post-operative complications.


Asunto(s)
Neoplasias de los Párpados/cirugía , Neoplasias de los Párpados/veterinaria , Procedimientos de Cirugía Plástica/veterinaria , Animales , Enfermedades de los Perros/cirugía , Perros , Párpados/cirugía , Intención , Estudios Retrospectivos , Resultado del Tratamiento
9.
J Vet Intern Med ; 22(5): 1095-102, 2008.
Artículo en Inglés | MEDLINE | ID: mdl-18681923

RESUMEN

BACKGROUND: Although B-mode ultrasound is very sensitive for the detection of splenic lesions, its specificity is low. Contrast harmonic imaging is used successfully to differentiate benign from malignant liver lesions in humans and dogs. HYPOTHESIS: Contrast harmonic imaging could be useful to differentiate benign and malignant splenic lesions in dogs. ANIMALS: Sixty dogs (clinical patients) with splenic abnormalities detected during abdominal ultrasonography. METHODS: A prospective study was performed with a Philips ATL 5000 unit for contrast pulse inversion harmonic imaging (mechanical index: 0.08, contrast medium: SonoVue). Perfusion was assessed subjectively and quantitatively. RESULTS: Cytology or histology identified 27 benign (hyperplasia, extramedullary hematopoiesis, hematoma) and 29 malignant (hemangiosarcoma, malignant lymphoma, malignant histiocytosis, mesenchymal tumors without classification, mast cell tumors, and others) lesions and 4 normal spleens. Except for 1 benign nodule, extensive to moderate hypoechogenicity was only seen in malignant lesions during wash-in, at peak enhancement, and during wash-out (P= .0001, odds ratios: 37.9 [95% CI 4.5-316.5], 66.4 [95% CI 8.0-551.1], and 36.9 [95% CI 4.4-308.4]). Although all but 1 benign lesion enhanced well and were mildly hypo-, iso-, or hyperechoic in comparison with the normal spleen during all blood pool phases, marked enhancement occurred both in benign as well as in malignant splenic lesions. Quantitative perfusion values did not differ significantly between benign and malignant lesions. CONCLUSIONS AND CLINICAL IMPORTANCE: Moderate to extensive hypoechogenicity clearly identifies canine splenic malignant lesions. In nodules with marked enhancement, contrast harmonic ultrasound is of limited value and histology is needed.


Asunto(s)
Medios de Contraste/farmacología , Enfermedades de los Perros/diagnóstico por imagen , Enfermedades del Bazo/veterinaria , Animales , Perros , Femenino , Masculino , Enfermedades del Bazo/diagnóstico por imagen , Enfermedades del Bazo/patología , Ultrasonografía
10.
J Vet Intern Med ; 32(1): 107-110, 2018 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-29131404

RESUMEN

BACKGROUND: Sialocele is a collection of saliva that has leaked from a damaged salivary gland or duct and is surrounded by granulation tissue. Surgery is the recognized first-line treatment. Recurrence rate after surgery is 5-14%. Salivary gland tissue is very sensitive to radiation therapy (RT). HYPOTHESIS/OBJECTIVES: Radiation therapy will be useful for the treatment of sialocele. The aims were to characterize response rate and clinical course of dogs with sialocele treated with RT and to determine a starting dose for clinical use. ANIMALS: Eleven dogs with sialocele. METHODS: Retrospective study of response and outcome after RT. RESULTS: All dogs had cervical sialocele. Seven dogs (63.6%) were treated with 3 weekly fractions of 4 Gray (Gy); (total dose, 12 Gy). Three dogs (27.3%) received 4 fractions of 4 Gy (16 Gy) and 1 dog received 5 fractions of 4 Gy (20 Gy) on a Monday-Wednesday-Friday schedule. Six dogs (54%) achieved a complete response (CR), and 5 dogs (45%) achieved a partial response (PR). Three dogs had progression of their sialocele 2, 3, and 9 months after RT; all three had received 12 Gy initially and 2 received 2 additional fractions of 4 Gy (cumulative total dose, 20 Gy) and subsequently achieved remission for >2 years. CONCLUSIONS AND CLINICAL IMPORTANCE: Radiation therapy is useful for the treatment of recurrent sialocele refractory to surgical management and a minimum total dose of 16 or 20 Gy in 4 Gy fractions appears effective.


Asunto(s)
Enfermedades de los Perros/radioterapia , Enfermedades de las Glándulas Salivales/veterinaria , Animales , Estudios de Cohortes , Enfermedades de los Perros/cirugía , Perros , Electrones/efectos adversos , Electrones/uso terapéutico , Femenino , Masculino , Inducción de Remisión/métodos , Estudios Retrospectivos , Enfermedades de las Glándulas Salivales/radioterapia , Enfermedades de las Glándulas Salivales/cirugía , Resultado del Tratamiento
11.
Vet Comp Oncol ; 14(4): e135-e145, 2016 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-25393921

RESUMEN

Soft tissue sarcomas (STSs) are locally invasive and surgery with or without radiation therapy is the current standard of care in dogs. Typical protocols for treating incompletely excised STSs involve curative intent radiation with total dose in excess of 50 Gy. Forty-eight dogs with histologically confirmed incomplete or closely excised STSs were treated with a hypofractionated protocol that is typically reserved for palliative radiation therapy (RT) (6-8 Gy/weekly fractions to a total dose of 24-32 Gy). Ten dogs (21%) developed local recurrence, 11 dogs (23%) developed metastasis, and 3 dogs developed both (included in each group). The median progression free survival was 698 days. The local failure-free probability at 1 and 3 years was 81 and 73%. The 1 and 3 years tumour-specific overall survival was 81 and 61%. Long-term local tumour control was achieved in the majority of dogs. This protocol is reasonable to prescribe in older patients or when financial limitations exist.


Asunto(s)
Enfermedades de los Perros/radioterapia , Sarcoma/veterinaria , Neoplasias de los Tejidos Blandos/veterinaria , Animales , Supervivencia sin Enfermedad , Enfermedades de los Perros/patología , Perros , Femenino , Masculino , Hipofraccionamiento de la Dosis de Radiación , Sarcoma/patología , Sarcoma/radioterapia , Neoplasias de los Tejidos Blandos/patología , Neoplasias de los Tejidos Blandos/radioterapia
12.
Arch Pediatr ; 23(1): 39-44, 2016 Jan.
Artículo en Francés | MEDLINE | ID: mdl-26586547

RESUMEN

INTRODUCTION: While the number of international adoptions in France is decreasing, adopted children are older and in poorer health than they used to be. This phenomenon has resulted in an increase in the demand for preadoption consultations over the past several years. This study analyses the reasons for these consultations. METHOD: Prospective multicenter study conducted from 1 January to 31 December 2013. RESULTS: Ten centers contributed to the study, i.e., 196 preadoption consultations. Seeking medical advice was the reason for 88% of the consultations, whether the advice was based on the study of an identified child's medical file (32%) or a country's healthcare characteristics, whether the country was identified (34%) or not (23%). In 6% of cases, the motive for preadoption consultations was social and familial, and in the last 5% it was to obtain general information about adoption and its procedures. In more than 40% of the cases, whether the child or the country identified, Russia is the subject of the consultation because of the complexity of the files and because of the dreaded but rarely mentioned fetal alcohol syndrome. CONCLUSION: The deterioration of adopted children's health is an additional worry for future adoption applicants. To provide them with the best information possible without making choices for them, specialists should have substantial experience in adoption before going into these preadoption consultations.


Asunto(s)
Adopción , Estado de Salud , Motivación , Derivación y Consulta/estadística & datos numéricos , Preescolar , Femenino , Francia , Humanos , Internacionalidad , Masculino , Estudios Prospectivos
13.
Oncogene ; 3(2): 143-9, 1988 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-2842712

RESUMEN

Tissue samples and cell cultures from Wilms' tumour matched histologically normal kidney samples and EBV transformed B cells from the same patients, were analysed to detect changes in the structure and expression of the N-myc oncogene. The levels of expression of HLA class I and hypoxanthine guanine phosphoribosyl transferase were also measured in the various RNA preparations. Related tissue samples, from sources including congenital mesoblastic nephroma, paediatric neuroblastoma and a number of foetal tissues were also tested. Northern blot analysis indicated that the levels of N-myc were higher in Wilms' tumour tissues (with no parallel increase in gene copy number) compared to all other sources of material including foetal kidney. Particularly high levels of expression were observed in a number of the Wilms' tumours, several of which produced metastases. In situ hybridization, using [35S]-labelled RNA probes, confirmed that the high levels of N-myc RNA were present in the blastemal elements in the Wilms' tumour. All the tissue cultures, and tissue samples from other sources, except foetal brain and neuroblastoma, contained uniformly low levels of N-myc RNA.


Asunto(s)
Neoplasias Renales/genética , Oncogenes , Tumor de Wilms/genética , Niño , Preescolar , Antígenos HLA/genética , Humanos , Hipoxantina Fosforribosiltransferasa/genética , Lactante , ARN Mensajero/análisis , Células Tumorales Cultivadas
14.
Oncogene ; 7(4): 763-8, 1992 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-1314370

RESUMEN

A candidate gene (WT1) has recently been described for the 11p13 tumour-suppressor gene involved in the development of Wilms' tumour. This gene encodes a zinc finger protein which can bind to a specific DNA sequence. We have found a 226 base deletion in the mRNA from a unilateral Wilms' tumour, which would cause a frameshift that completely deletes the zinc finger domain. The tumour developed in a patient suffering from the WAGR syndrome, who had a constitutional 11p13 deletion, and so the 226 base deletion represents the inactivation of the remaining WT1 allele in the tumour. This provides further direct evidence that loss of function of WT1 is an essential step in the development of Wilms' tumour.


Asunto(s)
Anomalías Múltiples/genética , Aniridia/genética , Proteínas de Unión al ADN/genética , Anomalías Urogenitales , Tumor de Wilms/genética , Secuencia de Aminoácidos , Secuencia de Bases , Southern Blotting , Deleción Cromosómica , Cromosomas Humanos Par 11 , ADN de Neoplasias/genética , Genes Supresores de Tumor , Humanos , Datos de Secuencia Molecular , Oligodesoxirribonucleótidos/química , Reacción en Cadena de la Polimerasa , ARN Neoplásico/genética , Síndrome , Proteínas WT1 , Dedos de Zinc
15.
Gene ; 194(1): 115-23, 1997 Jul 18.
Artículo en Inglés | MEDLINE | ID: mdl-9266680

RESUMEN

Cytomegalovirus-based mammalian expression vectors are widely used to drive the expression of transfected genes in cultured cells. Immunofluorescent staining of the WT1 protein in 3T3 and 293 cell clones, stably transfected with a cyomegalovirus (CMV) expression vector carrying a cDNA coding for the tumour suppressor protein WT1, showed extreme cell to cell variation in the amount of recombinant protein expressed, indicative of cell cycle dependence. This was investigated further by Western blot and FACS analysis which showed that WT1 protein expression was highest in S phase and almost absent in G0/G1. Northern blot analysis of cell clones expressing sense or antisense WT1 cDNAs regulated by the CMV promoter/enhancer showed that RNA expression was also cell cycle-dependent. Western blotting of cells expressing a luciferase reporter gene driven by the CMV promoter/enhancer also showed apparent cell cycle-dependent expression. We further demonstrated that the expression of these gene constructs was serum responsive with a 10-fold increase in expression occurring 2 h after the addition of serum. These results show that the CMV promoter/enhancer system varied in its response to serum and the cell cycle state. Therefore, care must be taken when interpreting any phenotypic alterations (or lack of them) produced in cells transfected with CMV-based expression vectors.


Asunto(s)
Ciclo Celular , Citomegalovirus , Proteínas de Unión al ADN/biosíntesis , Genes del Tumor de Wilms , Vectores Genéticos , Proteínas Recombinantes de Fusión/biosíntesis , Factores de Transcripción/biosíntesis , Transfección/métodos , Células 3T3 , Animales , Sangre , Línea Celular Transformada , Células Clonales , Medios de Cultivo , Proteínas de Unión al ADN/genética , Genes Reporteros , Humanos , Riñón , Luciferasas/biosíntesis , Mamíferos , Ratones , Factores de Transcripción/genética , Proteínas WT1
16.
FEBS Lett ; 349(1): 75-8, 1994 Jul 25.
Artículo en Inglés | MEDLINE | ID: mdl-8045305

RESUMEN

The human Wilms tumour suppressor gene, WT1, encodes a zinc-finger protein which can function as a transcriptional activator or suppressor. This study reports the analysis of the human WT1 gene promoter, and demonstrates that high levels of WT1 expression lead to autosuppression of the WT1 promoter. Deletion analyses of the promoter region implicate sequences 5' and 3' of the transcriptional start site as being crucial in WT1 autosuppression. Loss or alteration of this function of WT1 may be important in tumourigenesis.


Asunto(s)
Proteínas de Unión al ADN/genética , Regulación de la Expresión Génica , Regiones Promotoras Genéticas/genética , Supresión Genética , Análisis Mutacional de ADN , Genes Supresores de Tumor/genética , Humanos , Eliminación de Secuencia , Proteínas WT1 , Tumor de Wilms/genética
17.
Int J Oncol ; 7(3): 623-30, 1995 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-21552882

RESUMEN

Chromosome 11p15 has been suggested to be a potential site for a second Wilms' tumour gene (a childhood nephroblastoma). Human foetal kidney cells and normal kidney cells from Wilms' tumour patients were transformed with SV40 derivative vectors. As some of the cell lines progressed to tumorigenicity, we observed that chromosome 11p13, site of the WT1 suppressor gene, did not show any allelic loss. However, RFLP analysis showed that chromosome 11p15 was affected by allelic losses on different genes in some cell lines but not necessarily prior to the appearance of tumorigenicity. We also observed that the most aggressive cell Line (SVCU/NK), derived from the normal kidney cells of a Wilms' tumour patient, showed increased expression of c-Ha-ras proto-oncogene at later passage and in the tumour tissue extracted from nude mice. Finally we report a lack of tumour suppression activity of one cell line SVT1B6/NK, when fused with the tumorigenic G401 cell line (the latter has been used in tumour suppression experiments as a Wilms' tumour cell line before being identified as a Rhabdoid tumour cell line). These experiments are consistent with the existence of a suppressor gene at chromosome 11p15.

18.
J Thorac Cardiovasc Surg ; 69(2): 223-9, 1975 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-123018

RESUMEN

Hypoplasia of the aortic valve annulus and ascending aorta is a rare form of congenital aortic stenosis, with a poor prognosis. Replacement of the aortic valve and ascending aorta with a suitable prosthesis is feasible, but the hypoplastic valve annulus must also be enlarged if an adult-sized aortic valve is to be placed in the subcornary position. In an effort to develop a new method of surgical treatment for this congenital abnormality, we fabricated a prosthesis which can be interposed between the left ventricular apex and descending thoracic aorta. This prosthesis is coupled to a 25 mm. Dacron graft and xenograft valve and is lined with flocked Dacron fibrils to encourage formation of a stable biologic lining and prevent thrombus buildup. The prosthesis was implanted in a 22 year old male patient of the Children's Hospital Medical Center without difficulty. Postoperative cardiac catheterization idicated that all of the contrast material was ejected from the left ventricle through the prosthesis. The patient was discharged from the hospital taking sodium warfarin and remains entirely asymptomatic.


Asunto(s)
Estenosis de la Válvula Aórtica/cirugía , Válvula Aórtica/trasplante , Prótesis Vascular , Ventrículos Cardíacos , Trasplante Heterólogo , Adulto , Angiocardiografía , Prótesis Vascular/instrumentación , Cateterismo Cardíaco , Estudios de Seguimiento , Humanos , Masculino , Tereftalatos Polietilenos , Circulación Pulmonar , Acero Inoxidable , Trombosis/prevención & control , Warfarina/uso terapéutico
19.
J Thorac Cardiovasc Surg ; 70(5): 880-95, 1975 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-127093

RESUMEN

Surgical patients who cannot be weaned from cardiopulmonary bypass during operation or who develop balloon-dependent left ventricular failure postoperatively are now considered unsavable. However, in those with potentially reversible ventricular dysfunction, recovery might be possible if an improved means of temporary circulatory support were available. Towards this end, a pneumatically actuated, left ventricular assist pump was developed and evaluated in 20 consecutive calf experiments. The device, containing a flexible polyurethane pumping chamber, was positioned on the chest wall and connected to the left ventricular apex and descending thoracic aorta by two Dacron valved conduits (xenograft valves). All animals survived a 14 to 30 day pumping interval, and 7 underwent successful removal of the device by division of the Dacron conduits below skin level. As a prelude to human investigation, pumps were implanted during a series of routine autopsies through midline sternotomy incison. The device was positioned on the right anterolateral chest wall, with two valved conduits traversing the mediastinum to connect the pump to the left ventricular apex and ascending aorta.


Asunto(s)
Circulación Asistida/instrumentación , Animales , Aorta Torácica/cirugía , Válvula Aórtica/trasplante , Circulación Asistida/métodos , Presión Sanguínea , Gasto Cardíaco , Puente Cardiopulmonar/efectos adversos , Bovinos , Modelos Animales de Enfermedad , Insuficiencia Cardíaca/etiología , Insuficiencia Cardíaca/terapia , Frecuencia Cardíaca , Ventrículos Cardíacos , Tereftalatos Polietilenos , Poliuretanos , Complicaciones Posoperatorias/terapia , Porcinos , Trasplante Heterólogo
20.
J Thorac Cardiovasc Surg ; 122(6): 1186-95, 2001 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-11726895

RESUMEN

BACKGROUND: Despite advances in heart transplantation and mechanical circulatory support, mortality among transplant candidates remains high. Better ways are needed to ensure the survival of transplant candidates both inside and outside the hospital. METHODS: In a prospective, multicenter clinical trial conducted at 24 centers in the United States, 280 transplant candidates (232 men, 48 women; median age, 55 years; range, 11-72 years) unresponsive to inotropic drugs, intra-aortic balloon counterpulsation, or both, were treated with the HeartMate Vented Electric Left Ventricular Assist System (VE LVAS). A cohort of 48 patients (40 men, 8 women; median age, 50 years; range, 21-67 years) not supported with an LVAS served as a historical control group. Outcomes were measured in terms of laboratory data (hemodynamic, hematologic, and biochemical), adverse events, New York Heart Association functional class, and survival. RESULTS: The VE LVAS-treated and non-VE LVAS-treated (control) groups were similar in terms of age, sex, and distribution of patients by diagnosis (ischemic cardiomyopathy, idiopathic cardiomyopathy, and subacute myocardial infarction). VE LVAS support lasted an average of 112 days (range, < 1-691 days), with 54 patients supported for > 180 days. Mean VE LVAS flow (expressed as pump index) throughout support was 2.8 L x min(-1) x m(-2). Median total bilirubin values decreased from 1.2 mg/dL at baseline to 0.7 mg/dL (P =.0001); median creatinine values decreased from 1.5 mg/dL at baseline to 1.1 mg/dL (P =.0001). VE LVAS-related adverse events included bleeding in 31 patients (11%), infection in 113 (40%), neurologic dysfunction in 14 (5%), and thromboembolic events in 17 (6%). A total of 160 (58%) patients were enrolled in a hospital release program. Twenty-nine percent of the VE LVAS-treated patients (82/280) died before receiving a transplant, compared with 67% of controls (32/48) (P <.001). Conversely, 71% of the VE LVAS-treated patients (198/280) survived: 67% (188/280) ultimately received a heart transplant, and 4% (10/280) had the device removed electively. One-year post-transplant survival of VE LVAS-treated patients was significantly better than that of controls (84% [158/188] vs 63% [10/16]; log rank analysis P =.0197). CONCLUSION: The HeartMate VE LVAS provides adequate hemodynamic support, has an acceptably low incidence of adverse effects, and improves survival in heart transplant candidates both inside and outside the hospital. The studies of the HeartMate LVAS (both pneumatic and electric) for Food and Drug Administration approval are the only studies with a valid control group to show a survival benefit for cardiac transplantation.


Asunto(s)
Trasplante de Corazón , Corazón Auxiliar , Estudios de Cohortes , Diseño de Equipo , Femenino , Trasplante de Corazón/mortalidad , Corazón Auxiliar/efectos adversos , Hemodinámica/fisiología , Humanos , Masculino , Persona de Mediana Edad , Estudios Prospectivos , Factores de Riesgo , Tasa de Supervivencia , Factores de Tiempo , Resultado del Tratamiento , Listas de Espera
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