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2.
Radiat Oncol ; 14(1): 26, 2019 Feb 04.
Artigo em Inglês | MEDLINE | ID: mdl-30717810

RESUMO

BACKGROUND: The SCOPE trials (SCOPE 1, NeoSCOPE and SCOPE 2) have been the backbone of oesophageal RT trials in the UK. Many changes in oesophageal RT techniques have taken place in this time. The SCOPE trials have, in addition to adopting these new techniques, been influential in aiding centres with their implementation. We discuss the progress made through the SCOPE trials and include details of a questionnaire sent to participating centres. to establish the role that trial participation played in RT changes in their centre. METHODS: Questionnaires were sent to 47 centres, 27 were returned. RESULTS: 100% of centres stated their departmental protocol for TVD was based on the relevant SCOPE trial protocol. 4DCT use has increased from 42 to 71%. Type B planning algorithms, mandated in the NeoSCOPE trial, were used in 79.9% pre NeoSCOPE and now in 83.3%. 12.5% of centres were using a stomach filling protocol pre NeoSCOPE, now risen to 50%. CBCT was mandated for IGRT in the NeoSCOPE trial. 66.7% used this routinely pre NeoSCOPE/SCOPE 2 which has risen to 87.5% in the survey. CONCLUSION: The results of the questionnaires show how participation in national oesophageal RT trials has led to the adoption of newer RT techniques in UK centres, leading to better patient care.


Assuntos
Quimiorradioterapia , Neoplasias Esofágicas/terapia , Planejamento da Radioterapia Assistida por Computador/métodos , Planejamento da Radioterapia Assistida por Computador/normas , Algoritmos , Ensaios Clínicos Fase II como Assunto , Humanos , Estudos Multicêntricos como Assunto , Prognóstico , Dosagem Radioterapêutica , Inquéritos e Questionários
3.
Clin Oncol (R Coll Radiol) ; 25(6): 368-77, 2013 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-23489868

RESUMO

The SCOPE 1 trial closed to recruitment in early 2012 and has demonstrably improved the quality of UK radiotherapy. It has also shown that there is an enthusiastic upper gastrointestinal clinical oncology community that can successfully complete trials and deliver high-quality radiotherapy. Following on from SCOPE 1, this paper, authored by a consensus of leading UK upper gastrointestinal radiotherapy specialists, attempts to define current best practice and the questions to be answered by future clinical studies. The two main roles for chemoradiotherapy (CRT) in the management of potentially curable oesophageal cancer are definitive (dCRT) and neoadjuvant (naCRT). The rates of local failure after dCRT are consistently high, showing the need to evaluate more effective treatments, both in terms of optimal local and systemic therapeutic components. This will be the primary objective of the next planned UK dCRT trial and here we discuss the role of dose escalation and systemic therapeutic options that will form the basis of that trial. The publication of the Dutch 'CROSS' trial of naCRT has shown that this pre-operative approach can both be given safely and offer a significant survival benefit over surgery alone. This has led to the development of the UK NeoSCOPE trial, due to open in 2013. There will be a translational substudy to this trial and currently available data on the role of biomarkers in predicting response to therapy are discussed. Postoperative reporting of the pathology specimen is discussed, with recommendations for the NeoSCOPE trial. Both of these CRT approaches may benefit from recent developments, such as positron emission tomography/computed tomography and four-dimensional computed tomography for target volume delineation, planning techniques such as intensity-modulated radiotherapy and 'type b' algorithms and new treatment verification methods, such as cone-beam computed tomography. These are discussed here and recommendations made for their use.


Assuntos
Neoplasias Esofágicas/tratamento farmacológico , Neoplasias Esofágicas/radioterapia , Quimiorradioterapia/estatística & dados numéricos , Quimiorradioterapia/tendências , Ensaios Clínicos Fase II como Assunto , Humanos , Terapia Neoadjuvante/estatística & dados numéricos , Terapia Neoadjuvante/tendências , Ensaios Clínicos Controlados Aleatórios como Assunto , Reino Unido
4.
Clin Oncol (R Coll Radiol) ; 21(9): 713-9, 2009 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-19733469

RESUMO

AIMS: Radiotherapy for pancreatic cancer is complicated by the frequent overlapping of the planning target volume (PTV) and the organ at risk (OAR), limiting the dose that can be safely delivered to the tumour. Individualising the margins applied to the clinical target volume (CTV) may reduce OAR irradiation without increasing the risk of geographical miss. We quantified the movement of the pancreas with respiration and evaluated whether individualised margins based on this motion reduced the dose to OARs. MATERIALS AND METHODS: Planning computed tomography scans were acquired in quiet breathing, held expiration and held inspiration. Organ motion was evaluated from displacement of a reproducible point within the pancreas in all directions. Two sets of plans (standard plan: P(stan); individualised plan incorporating movement data: P(ind)) were generated for each patient. The PTV and doses to OARs were evaluated for both sets of plans. RESULTS: The mean (standard deviation) movement of the pancreas in the superior-inferior, lateral and anterior-posterior directions were 15.3 mm (4.3), 5.2 mm (3.5) and 9.7 mm (6.1), respectively. The use of individualised margins reduced the mean PTV volume by 33.5% (9.8) (P=0.0051). The proportional reductions in the percentage of kidney receiving >10 Gy, small bowel >45 Gy and liver >30 Gy were 63.7% (P=0.0051), 29.3% (P=0.0125) and 29.2% (P=0.0107), respectively. For the same level of OAR constraints, individualised margins allowed dose escalation in six of the 10 patients to a mean dose of 63.2 Gy. CONCLUSIONS: The present study shows a simple way of incorporating organ motion into the planning process and can be adopted by any centre without major strain on healthcare resources. The use of individualised margins reduced PTV volume and the dose to OARs. This may offer an opportunity for dose escalation to try and further improve local control.


Assuntos
Movimento , Neoplasias Pancreáticas/radioterapia , Planejamento da Radioterapia Assistida por Computador/métodos , Respiração , Idoso , Feminino , Humanos , Imageamento Tridimensional/métodos , Masculino , Pessoa de Meia-Idade , Neoplasias Pancreáticas/epidemiologia , Técnicas de Imagem de Sincronização Respiratória , Estudos Retrospectivos , Tomografia Computadorizada por Raios X/métodos
6.
West Indian med. j ; 57(4): 332-336, Sept. 2008. ilus, graf, tab
Artigo em Inglês | LILACS | ID: lil-672374

RESUMO

Percutaneous transluminal coronary angioplasty (PTCA) is a novel procedure to Barbadian healthcare. Only one centre in Barbados provides PTCA and stenting. This is a retrospective study aimed at describing the initial results of coronary angioplasty and stenting in the first 48 patients at the Carib-American Heart Centre and exploring the feasibility and safety of coronary angioplasty and stenting in Barbados. Forty-eight patients underwent PTCA during the period March 2002 to June 2004 inclusive, with or without intracoronary stenting. Most (64.6%) of the patients were male and 43.7% were diabetic. The most common vessels involved were the left anterior descending coronary artery (LAD) and the right coronary artery (RCA). In one patient, attempted stenting was unsuccessful but PTCA reduced stenosis. One patient had previous PTCA and stenting of the LAD and two patients had coronary artery bypass grafting (CABG) prior to the procedure. Twenty-one per cent of the patients treated had severe triple vessel disease. There were no cases of restenosis or acute vessel closure, during or immediately following the procedure that required emergency PTCA or CABG. All patients were discharged within 24 hours of the procedure. Procedural success was 100%. In conclusion, outpatient PTCA and stenting is safe and feasible in the Barbadian population. Coronary artery bypass grafting is still the procedure of choice for treating coronary artery disease (CAD) involving the left main coronary artery but PTCA is indicated in some cases of severe triple vessel disease.


La angioplastia coronaria transluminal percútanla (ACTP) es un procedimiento nuevo en la atención a la salud en Barbados. Sólo un centro en Barbados ofrece ACTP y estent (o cánula intraluminal de arteria coronaria). El presente trabajo es un estudio retrospectivo destinado a describir los resultados iniciales de la angioplastia y el estent coronarios en los primeros 48 pacientes en el Centro Caribe-americano de Cardiología, y explorar la factibilidad y seguridad de la angioplastia y el estent en Barbados. Cuarenta y ocho pacientes fueron sometidos a ACTP durante el periodo de marzo 2002 a junio 2004 inclusive, con o sin estent intracoronario. La mayor parte (64.6%) de los pacientes eran varones y un 43.7% eran diabéticos. Los vasos más comúnmente involucrados fueron la arteria coronaria descendente anterior izquierda (DAI) y la arteria coronaria derecha (ACD). En un paciente, el intento de estent no tuvo éxito, pero la ACTP redujo la estenosis. A un paciente le fue practicada previamente la ACTP y el estent de la DAI, y a dos pacientes se les realizó injerto de bypass de la arteria coronaria (IBAC) antes del procedimiento. El veintiún por ciento de los pacientes tratados tuvo enfermedad vascular triple. No hubo ningún caso de reestenosis o cierre vascular agudo, durante o inmediatamente después del procedimiento, que requiriera ACTP o IBAC de emergencia. Todos los pacientes fueron dados de alta dentro de las 24 horas tras el procedimiento. El éxito de los procedimientos fue del 100%. En conclusión, el estent y el ACTP ambulatorios son seguros y factibles para la población barbadense. El injerto de bypass de la arteria coronaria sigue siendo el procedimiento de elección para tratar casos de la enfermedad de la arteria coronaria (EAC) que involucren la arteria coronaria izquierda principal, pero la ACTP se indica en algunos casos de enfermedad vascular triple.


Assuntos
Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Angioplastia Coronária com Balão/estatística & dados numéricos , Angiografia Coronária , Doença da Artéria Coronariana/terapia , Stents/estatística & dados numéricos , Angina Pectoris/fisiopatologia , Angina Pectoris/terapia , Angioplastia Coronária com Balão/efeitos adversos , Barbados , Estudos de Viabilidade , Estudos Retrospectivos , Fatores de Tempo , Resultado do Tratamento
7.
Ear Nose Throat J ; 79(9): 738, 741-3, 2000 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-11011495

RESUMO

Isolated primary non-Hodgkin's lymphoma of the frontal sinus is rare. We describe the case of a middle-aged man who came to us with signs of orbital cellulitis complicating an acute infected frontal mucocele. His condition was initially controlled with medical therapy and subsequent endoscopic sinus surgery, but his symptoms eventually returned. We were able to diagnose the lymphoma only by approaching the sinus externally to obtain a biopsy. This case highlights the importance of making a full visual inspection of the involved sinus in order to avoid missing an unexpected, albeit a rarely encountered, pathology.


Assuntos
Seio Frontal , Linfoma de Células B/diagnóstico , Mucocele/complicações , Neoplasias dos Seios Paranasais/diagnóstico , Complicações Pós-Operatórias/diagnóstico , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Celulite (Flegmão)/etiologia , Contraindicações , Endoscopia , Seio Frontal/patologia , Seio Frontal/cirurgia , Humanos , Linfoma de Células B/complicações , Linfoma de Células B/patologia , Linfoma de Células B/terapia , Masculino , Pessoa de Meia-Idade , Mucocele/cirurgia , Neoplasias dos Seios Paranasais/complicações , Neoplasias dos Seios Paranasais/patologia , Neoplasias dos Seios Paranasais/terapia , Reoperação , Tomografia Computadorizada por Raios X
9.
J Virol ; 72(12): 9459-69, 1998 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-9811679

RESUMO

gp64 is the major envelope glycoprotein in the budded form of Autographa californica multicapsid nucleopolyhedrovirus (AcMNPV). gp64 is essential for AcMNPV infection, as it mediates penetration of budded virus into host cells via the endocytic pathway. In this study, we used site-directed mutagenesis to map the positions of the N-linked glycans on AcMNPV gp64, characterize their structures, and evaluate their influence on gp64 function. We found that four of the five consensus N-glycosylation sites in gp64 are used, and we mapped the positions of those sites to amino acids 198, 355, 385, and 426 in the polypeptide chain. Endoglycosidase H sensitivity assays showed that N-linked glycans located at different positions are processed to various degrees. Lectin blotting analyses showed that each N-linked glycan on gp64 contains alpha-linked mannose, all but one contains alpha-linked fucose, and none contains detectable beta-linked galactose or alpha2,6-linked sialic acid. The amounts of infectious progeny produced by AcMNPV mutants lacking one, two, or three N-linked glycans on gp64 were about 10- to 100-fold lower than wild-type levels. This reduction did not correlate with reductions in the expression, transport, or inherent fusogenic activity of the mutant gp64s or in the gp64 content of mutant budded virus particles. However, all of the mutant viruses bound more slowly than the wild type. Therefore, elimination of one or more N-glycosylation sites in AcMNPV gp64 impairs binding of budded virus to the cell, which explains why viruses containing these mutant forms of gp64 produce less infectious progeny.


Assuntos
Nucleopoliedrovírus/genética , Polissacarídeos/genética , Proteínas Virais de Fusão/genética , Animais , Sítios de Ligação/genética , Fusão Celular , Linhagem Celular , Genes Virais , Glicosilação , Mutagênese Sítio-Dirigida , Mutação , Nucleopoliedrovírus/crescimento & desenvolvimento , Nucleopoliedrovírus/patogenicidade , Polissacarídeos/química , Polissacarídeos/metabolismo , Spodoptera , Proteínas Virais de Fusão/química , Proteínas Virais de Fusão/metabolismo , Virulência/genética
10.
Br J Cancer ; 68(3): 617-20, 1993 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-8353052

RESUMO

We have examined the incidence of Harvey ras mutations in human squamous cell carcinomas (SCC) of the upper aerodigestive tract using the polymerase chain reaction (PCR) followed by direct sequencing. No mutations were detected at codons 12, 13, 59 or 61 of this gene in any of six papillomas, five erythroplakias, 56 squamous cell carcinomas, and 16 SCC cell lines. Some of the SCC were lymph node metastases (three) or tumours which had recurred following radiotherapy (seven). We conclude that Harvey ras mutations are not a common event in the pathogenesis or recurrence of SCCs from Caucasian subjects, in contrast to the situation with Indian populations (Saranath et al., 1991).


Assuntos
Carcinoma de Células Escamosas/genética , Genes ras , Neoplasias de Cabeça e Pescoço/genética , Sequência de Bases , Humanos , Dados de Sequência Molecular , Mutação , Reação em Cadeia da Polimerase , Células Tumorais Cultivadas , População Branca
11.
J Econ Entomol ; 83(2): 451-7, 1990 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-2345222

RESUMO

A field study on two caged layer poultry operations assessed whether selected pesticides would affect beneficial predators. Sampling was done three times during the 5-wk period before treatment, 3 d after each of two weekly treatments, and 5-6 times during the 10 wk after the second treatment. Cyromazine (0.1%) applied topically had no detrimental effect on any of the predator taxa. Dimethoate (0.5%) applied as a spot treatment to wet areas of the manure also did not reduce predator abundance. Permethrin (0.05%) applied as a direct treatment to the hens resulted in slight reductions in numbers of Histeridae and Staphylinidae in the manure. A resurgence of Fanniinae occurred at one site 3 wk after permethrin application. Treatment of whole houses with dimethoate (0.5%) resulted in short-term reductions (up to 3 wk) of predatory mites and reductions of Histeridae and Staphylinidae for 4-10 wk.


Assuntos
Besouros , Dimetoato , Inseticidas , Hormônios Juvenis , Piretrinas , Animais , Esterco , Permetrina , Aves Domésticas
12.
Postgrad Med J ; 54(632): 391-4, 1978 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-80003

RESUMO

The first year of running a new continuing Care Unit for patients with malignant disease demonstrated the importance of continuity of care in their management after curative measures have ceased to be appropriate. This was achieved by regular home visiting by Unit ataff, liaison with home care services and the promise of readmission whenever necessary. As a consequence good relationships with patients, relatives and community services were built up, the average duration of in-patient stay was reduced to 19.6 days and more effective episode care was possible, this being integrated with an understanding of the overall problem.


Assuntos
Assistência Integral à Saúde , Continuidade da Assistência ao Paciente , Serviços de Assistência Domiciliar , Neoplasias/terapia , Idoso , Analgésicos/uso terapêutico , Criança , Comunicação , Feminino , Unidades Hospitalares , Humanos , Tempo de Internação , Masculino , Pessoa de Meia-Idade , Cuidados Paliativos , Admissão do Paciente
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