RESUMO
The interweaving of malnutrition and symptoms of anxiety and depression in anorexia Nervosa (AN) is mentioned without any consensus regarding the course of anxious-depressive symptoms in relation to nutritional status in the course of treatment of patients with AN. The objectives of the current study in a large sample of AN inpatients were to assess the relationships between anxiety and depression symptoms and nutritional status both over the course of inpatient treatment and at discharge. 222 consecutive inpatients with AN (DSM-IV TR) were assessed (entrance and discharge) for duration of illness, psychiatric treatments, sociodemographic data and with psychometric scales for different psychopathological symptoms [depressive (BDI), anxiety and depressive (HAD scale), obsessive-compulsive (MOCI) and social phobia (LSAS fear score)]. Nutritional status was assessed with Body Mass Index (BMI) and body composition by bioelectrical impedance. The Fat free mass index [FFMI = FFM (kg)/height (m2)] was considered for the analysis. Two models were developed where the dependent variables were each psychopathological score at discharge (BDI, HAD anxiety, MOCI, and LSAS fear) in the cross-sectional model, and their variation in the longitudinal model (where a positive score reflected symptom decrease at discharge). A fixed set of predictors, defined on presumed clinical and statistical relevance (FFMI in the cross-sectional model and Variation of FFMI in the longitudinal model), were considered in each model, without any model selection procedure. This is the first study to confirm a positive relationship between the course of eating disorder symptoms and that of anxious-depressive symptoms during inpatient treatment of AN even after adjustment on a vast array of possibly confounding factors.
Assuntos
Anorexia Nervosa/metabolismo , Ansiedade/psicologia , Depressão/psicologia , Estado Nutricional , Adolescente , Adulto , Anorexia Nervosa/psicologia , Ansiedade/etiologia , Ansiedade/metabolismo , Índice de Massa Corporal , Estudos Transversais , Depressão/metabolismo , Humanos , Pessoa de Meia-Idade , Estudos Prospectivos , Inquéritos e Questionários , Adulto JovemRESUMO
INTRODUCTION: Peroneal tendinopathy is an under-diagnosed pathology, mainly triggered by ankle sprain. Failure of medical treatment often leads to surgery, with modalities adapted to the lesion type. The present study aimed to assess clinical and functional results of tendon repair and to analyze the influence of hindfoot alignment on quality of outcome. The study hypothesis was that hindfoot varus impairs medium-term results. MATERIALS AND METHODS: A retrospective series of 30 patients undergoing peroneal tendon repair or tenodesis was analyzed at a mean 20 months' follow-up. All patients had preoperative ultrasound scan or NMRI. Clinical assessment was based on AOFAS and FAAM scores. Hindfoot alignment was assessed on Méary view; 2 groups were distinguished: valgus (n=11) and varus (n=17). RESULTS: Mean AOFAS score improved, from 74.5±11.2 preoperatively to 86.7±9.4 at follow-up. There was a significant intergroup difference (p=0.0003) in AOFAS at follow-up: valgus, 93/100; varus, 82/100. There was no significant intergroup difference in FAAM score. Time to surgery, lesion type and surgical technique did not influence clinical results. DISCUSSION/CONCLUSION: Clinical results for surgical repair of peroneal tendons were satisfactory and in line with literature reports. However, hindfoot varus was associated with poorer results, raising the possibility of correction by opening wedge calcaneal osteotomy. LEVEL OF EVIDENCE: IV, retrospective case series.
Assuntos
Tendinopatia/cirurgia , Tenodese , Adulto , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos , Tendinopatia/diagnóstico por imagem , Tendinopatia/fisiopatologia , Resultado do Tratamento , Ultrassonografia , Adulto JovemRESUMO
BACKGROUND: The objective of this study was to assess clinical and computed-tomography (CT) outcomes at least 2 years after humeral head resurfacing to treat concentric gleno-humeral osteoarthritis. HYPOTHESIS: Humeral head resurfacing provides similar outcomes to those achieved with stemmed humeral head implants. MATERIALS AND METHODS: This single-centre retrospective study included 40 Copeland™ and 65 Aequalis™ humeral resurfacing heads implanted between 2004 and 2012. Mean patient age at diagnosis was 64 years. The diagnoses were osteoarthritis with an intact (68%) or torn (21%) rotator cuff, avascular necrosis (5%), osteoarthritis complicating chronic instability (3%), post-traumatic osteoarthritis (2%), and chronic inflammatory joint disease (1%). Validated clinical scores, radiographs, and CT before surgery and at last follow-up were compared. RESULTS: During the mean follow-up of 56 months, complications occurred in 24 implants. Revision surgery with reverse shoulder replacement was required in 18 cases, after a mean of 43.6 months, to treat glenoid wear or a rotator cuff tear. At last follow-up, for the implants that did not require revision surgery, the mean Constant score was 64/100. The implants had a mean varus of 5° and mean retroversion of -13.3°. The mean increase in glenoid cavity depth was 2.4mm. Mean increases in medial and lateral humeral offset were 1.9mm and 2.7mm, respectively. Pre-operative factors significantly associated with failure were rotator cuff tear (P=0.017) and glenoid erosion (P=0.001). DISCUSSION: We found a high failure rate related to glenoid wear or progressive rotator-cuff impairment, although CT showed no evidence of implant malposition or overstuffing. Previous studies of stemmed humeral head implants showed better outcomes. Given the low medium-term prosthesis survival rate, we now reserve humeral head resurfacing for concentric osteoarthritis without glenoid erosions or rotator cuff damage. LEVEL OF EVIDENCE: IV, retrospective study.
Assuntos
Artroplastia de Substituição , Cabeça do Úmero/cirurgia , Osteoartrite/cirurgia , Complicações Pós-Operatórias/etiologia , Articulação do Ombro/cirurgia , Adulto , Idoso , Idoso de 80 Anos ou mais , Artroplastia de Substituição/efeitos adversos , Artroplastia de Substituição/métodos , Feminino , Seguimentos , Cavidade Glenoide/diagnóstico por imagem , Humanos , Cabeça do Úmero/diagnóstico por imagem , Instabilidade Articular/complicações , Prótese Articular , Masculino , Pessoa de Meia-Idade , Osteoartrite/complicações , Osteonecrose/complicações , Falha de Prótese , Reoperação , Estudos Retrospectivos , Lesões do Manguito Rotador/complicações , Articulação do Ombro/diagnóstico por imagem , Prótese de Ombro/efeitos adversos , Tomografia Computadorizada por Raios XRESUMO
The availability of direct-acting antiviral agents (DAA) regimens has expanded the pool of patients eligible for treatment. However, data on the virologic response and tolerability of DAAs in elderly patients are lacking. We evaluated the efficacy and safety of DAAs in patients with advanced fibrosis/cirrhosis in real-life practice with the focus on those aged ≥65 years. Between January and December 2015, all consecutive patients with HCV-related advanced fibrosis/cirrhosis treated with DAA at eleven tertiary referral centres in Emilia Romagna (Italy) were enrolled. Regimen choice was based on viral genotype and stage of disease, according to guidelines. The primary end point was sustained virologic response 12 weeks after the end of treatment (SVR12). Overall, 282 of 556 (50.7%) patients evaluated were elderly, most of them with cirrhosis. Antiviral therapy was stopped prematurely in four (1.4%) patients. Two patients, both with cirrhosis, died during treatment due to worsening of liver/renal function. SVR12 was achieved by 94.7% and was comparable to that obtained in patients aged <65 (P=.074). Similar data were also reported in subgroup of patients aged ≥75 years. All patients with advanced fibrosis achieved virologic response. SVR12 was 80.8% in Child-Pugh-Turcotte (CTP)-B cirrhosis and 95.4% in CTP-A (P=.013). According to genotype, the SVR12 was achieved in 172 of 181 (95%) with genotype 1b cirrhosis and in 44 of 48 (91.7%) with genotype 2 cirrhosis. In conclusions, in a real-world setting, DAAs are safe and effective in elderly patients with HCV-related advanced fibrosis/cirrhosis, but SVR12 is lower with worsening CTP class.
Assuntos
Antivirais/efeitos adversos , Antivirais/uso terapêutico , Hepatite C Crônica/tratamento farmacológico , Adulto , Idoso , Idoso de 80 Anos ou mais , Genótipo , Hepacivirus/classificação , Hepacivirus/genética , Hepacivirus/isolamento & purificação , Hepatite C Crônica/virologia , Humanos , Itália , Pessoa de Meia-Idade , Estudos Retrospectivos , Resposta Viral Sustentada , Centros de Atenção Terciária , Resultado do Tratamento , Adulto JovemRESUMO
INTRODUCTION: Foot and ankle injuries (FAI) are very common, with about 6000 cases per day in France. Unlike lateral ankle sprain (LAS), the diagnosis of midtarsal joint sprain (MJS, also known as Chopart's joint sprain) is not widely known. This prospective study aims to detail the epidemiology of MJS and compare it to LAS. PATIENTS AND METHOD: The study was conducted within our institution over a period of 16 months. Patients with clinical signs predictive of MJS without radiographic bone lesion underwent ultrasound assessment. MJS was diagnosed in case of at least 1 lesion of the dorsal midtarsal joint ligaments. RESULTS: A total of 2412 patients consulted for FAI; 188 had clinical and radiographic criteria for ultrasound examination. Eighty-two cases of MJS were diagnosed (3.4% of FAIs). Sports injuries were more frequent in MJS (P=0.04), and mechanisms more varied than in LAS, with inversion injury in 75% of cases and plantar hyperflexion in 22%. Sprain was severe in 70% of cases, with complete ligament tear. Clinical and ultrasound analyses correlated in only 40% of cases of MJS, versus 98% for LAS. CONCLUSION: MJS is frequent, difficult to diagnose clinically, and often severe. Clinical presentation and injury mechanisms differ from ankle sprain. Ultrasound seems to be an indispensable tool in diagnosis.
Assuntos
Entorses e Distensões/diagnóstico por imagem , Entorses e Distensões/epidemiologia , Articulações Tarsianas/diagnóstico por imagem , Articulações Tarsianas/lesões , Adolescente , Adulto , Idoso , Traumatismos em Atletas/epidemiologia , Serviço Hospitalar de Emergência , Feminino , França/epidemiologia , Humanos , Ligamentos Articulares/diagnóstico por imagem , Ligamentos Articulares/lesões , Masculino , Pessoa de Meia-Idade , Estudos Prospectivos , Ultrassonografia , Adulto JovemRESUMO
BACKGROUND: Autoimmune hepatitis (AIH) is historically classified into type 1 and type 2 on the basis of the autoantibody profile, anti-nuclear and/or anti-smooth muscle antibodies being the serological markers of type 1 AIH, whereas anti-liver/kidney microsomal antibody type 1 and/or anti-liver cytosol antibody type 1 characterise type 2 AIH. AIM: To evaluate whether such a distinction is justified on the basis of different expression of the disease in adults. METHODS: Twenty-six adult patients with type 2 AIH and 52 age- and sex-matched patients with type 1 AIH, representative of the entire cohort of adults with type 1 AIH, were compared at onset and during follow-up. RESULTS: At diagnosis, median age was 26 years (range 17-53), female sex 86%, acute presentation 43%, severe liver histology 54%, cirrhosis 14%, complete response to treatment 52%, progression of the disease 17%, and median disease duration 72 months (range 12-280). HLA-DRB1*0301 was present in 26%, HLA-DRB1*0401 in 23% and HLA-DRB1*0701 in 25%. Clinical presentation, biochemical parameters, severe liver histology, genetic profile, response rate and progression of the disease were identical between type 1 and type 2 AIH. CONCLUSION: There is not enough clinical, biochemical, histological or genetic reason to subdivide adults with autoimmune hepatitis into type 1 and type 2 on the basis of the autoantibody profile, and the term 'autoimmune hepatitis' without qualification should be preferred.
Assuntos
Hepatite Autoimune/genética , Hepatite Autoimune/imunologia , Adulto , Idoso , Autoanticorpos , Biomarcadores , Progressão da Doença , Feminino , Cadeias HLA-DRB1 , Humanos , Cirrose Hepática/imunologia , Masculino , Pessoa de Meia-Idade , Fenótipo , Adulto JovemRESUMO
Two new permanent cell lines derived from squamous cell carcinomas of the tongue, CAL 27 and CAL 33, have been established in culture. Both cell lines were isolated in standard culture media without epidermal growth factor or fibroblast feeder layer to avoid obtaining clones of more differentiated cells. Analysis of the morphology, ultrastructure, karyotype and immunohistochemical properties of these two cell lines demonstrated that they are both well characterized, uncontaminated by HeLa cells, and do in fact correspond to transformed epithelial cells that have conserved certain characteristics of the original Malpighian epithelium. CAL 27 and CAL 33 have relatively long doubling times (35 and 43 h respectively). Their response to 14 drugs used for cancer chemotherapy was evaluated by a short term assay based on tritiated thymidine incorporation after exposure to the drugs. CAL 27 was more resistant than CAL 33 in all cases but one. Although cytogenetic examination revealed both lines to be malignant, neither CAL 27 nor CAL 33 produced colonies in soft agar; both lines were tumorigenic after inoculation into nude mice. This study clearly demonstrates the diversity of cancers of a given histologic form, in agreement with the diversity noted previously in vivo. Isolated without the use of any selection criteria, these cell lines constitute appropriate models for the study of human tumors.
Assuntos
Carcinoma de Células Escamosas/ultraestrutura , Neoplasias da Língua/ultraestrutura , Idoso , Antineoplásicos/farmacologia , Linhagem Celular , Células Clonais , Ensaios de Seleção de Medicamentos Antitumorais , Humanos , Cariotipagem , Masculino , Microscopia Eletrônica , Pessoa de Meia-Idade , Mitose , Células Tumorais Cultivadas/efeitos dos fármacosRESUMO
SISGRAD, the interactive computer system of the Antoine-Lacassagne Cancer Center Radiotherapy Department, has been operational since January 1982. It completes the computerized dosimetry system installed several years earlier and is fully integrated with the institution's central network. SISGRAD is in charge of surveillance of the radiotherapy treatments given by the Center's three radiotherapy units (1400 patients per year); it is also used for administrative purposes in the Department and physically connects all of the Department's operating stations. SISGRAD consists of a series of microcomputers connected to a common mass memory; each microcomputer is used as an intelligent console. SISGRAD was developed to guarantee that the treatments comply with prescriptions, to supply extemporaneous dosimetric data, to improve administrative work, and to supply banks with data for statistical analysis and research. SISGRAD actively intervenes to guarantee treatment quality and helps to improve therapy-related security factors. The present text describes the results of clinical use over a 4-year period. The consequences of integration of the system within the Department are analyzed, with special emphasis being placed on SISGRAD's role in the prevention and detection of errors in treatment prescription and delivery.
Assuntos
Sistemas de Gerenciamento de Base de Dados , Dosagem Radioterapêutica , Radioterapia/métodos , Software , Humanos , MicrocomputadoresRESUMO
To obtain more precise data on pulmonary doses in preparation for total body irradiation, the lung density of patients was systematically analyzed in treatment positions using data obtained by computed tomography (CT). With the patient supine, the lung density was not significantly different for the right and left lungs. In contrast, considerable differences were noted between the two lungs in lateral decubitus positions owing to variations in ventilation and perfusion. The relative electron density of lung was also found to decrease with age, dropping to pe = 0.160 at 71 years.
Assuntos
Absorciometria de Fóton , Pulmão/diagnóstico por imagem , Postura , Irradiação Corporal Total , Humanos , Gravidade Específica , Tomografia Computadorizada por Raios XRESUMO
The role of Ca2+-ATPase as the driving force for active calcium uptake, involved in the relaxation of smooth muscle, was studied. It was shown by immunocytochemistry that Ca2+-ATPase activity was localized at the plasma membrane level of longitudinal smooth muscle of pregnant rat uteri (18-20 days). To study calcium regulation in uterine longitudinal smooth muscle, 2 microsomal fractions (F1 and F2) were obtained, enriched in plasma membrane material (Lalanne et al., 1984, in: Calcium Regulation in Smooth Muscles. INSERM series, 124, pp. 283-292). In the present paper this material is characterized at both morphologic and cytochemical levels. Both fractions are ultrastructurally heterogeneous: (a) thin sections clearly show 2 populations that differ in vesicular shape and size; (b) negative staining also shows differences in membrane structure, which could be related to biochemical differences and/or to the well known heterogeneity of the plasma membrane. Two reactions (PATAg and concanavalin A-biotin-avidin-ferritin), allowing visualization of cell coat glycans, were performed on F1 and F2 and on thin sections of longitudinal smooth muscle. Plasma membrane and almost all the vesicles of F1 and F2 are reactive. It is concluded that these 2 fractions are characteristic enough for studying, at the molecular level, the ability of plasma membrane to control calcium circulation in uterine smooth muscle.
Assuntos
ATPases Transportadoras de Cálcio/metabolismo , Membrana Celular/enzimologia , Músculo Liso/enzimologia , Útero/enzimologia , Animais , Fracionamento Celular , Membrana Celular/ultraestrutura , Feminino , Histocitoquímica , Microscopia Eletrônica , Músculo Liso/ultraestrutura , Ratos , Receptores de Concanavalina A/metabolismo , Útero/ultraestruturaRESUMO
Several in vivo and in vitro test models were used to study the mechanism of action of fenoverine, a novel synchronizer of smooth muscle motility. In vivo, the effects of fenoverine were tested in the rabbit proximal colon, recording its ability to modify the electromyographic activity, either spontaneous or electrically elicited, in the presence or absence of atropine. Fenoverine did not influence the spontaneous motility nor did it modify the effects of atropine, but it significantly reduced the contractions elicited by electrical stimulation. In vitro, isolated rabbit and rat colon and isolated rat myometrium were used. In rabbit colon, fenoverine failed to influence the spontaneous motility as well as the effects of atropine, while significantly inhibiting the electrically elicited excitatory junction potential. Fenoverine also significantly inhibited the isometric contractions induced in rat myometrium and colon by electrical stimulation, by depolarization with hyperpotassic solution, as well as those induced by acetylcholine in calcium-free/EGTA medium, with ID50 ranging from 8.10(-7) to 3.1.10(-6) M except in the isolated colon following K+ depolarization (5.10(-5) M), all actions compatible with a calcium-modulating mechanism. Based on the reported data, it is concluded that fenoverine does not act as a muscarinic or opiate-receptor antagonist, but that its main mechanism of action is due to modulation of the calcium gradient across the muscular cell membrane by regulating the influx of the extracellular calcium and/or the release of the intracellular pool.
Assuntos
Cálcio/metabolismo , Motilidade Gastrointestinal/efeitos dos fármacos , Parassimpatolíticos/farmacologia , Fenotiazinas/farmacologia , Acetilcolina/farmacologia , Animais , Atropina/farmacologia , Colo/efeitos dos fármacos , Ácido Egtázico/farmacologia , Estimulação Elétrica , Eletromiografia , Técnicas In Vitro , Parassimpatolíticos/antagonistas & inibidores , Fenotiazinas/antagonistas & inibidores , Potássio/farmacologia , Coelhos , RatosRESUMO
The DNA labelling index (LI), representing the fraction of S-phase cells, was studied in 76 patients operated on for breast cancer from 1975 to 1979. No patient had lymph node involvement following axillary dissection (N-), and no adjuvant medical treatment was given. Patients were classified in one of two groups according to the median LI. Patient distribution by age, tumour size, and receptor status was identical in both groups. A higher frequency of grade 3 tumours was noted in the group with an LI above the median value. The cell proliferation rate was an important discriminative factor for metastatic potential. The probability of survival at 8 years for patients with a high LI was significantly lower than that of patients with low LI (36% versus 100%; p less than 0.001). Relapse-free survival at 8 years was respectively 56% and 83% (p less than 0.02). At 2 years, these values were 75% and 100%, indicating the early occurrence of metastases. By contrast, the LI had no prognostic value concerning loco-regional disease recurrence or survival after the appearance of metastasis. No relationship was found in this study between survival and other prognostic factors, namely tumour size, histological grade, or hormone receptor level. The LI currently appears to be the best prognostic factor for N- breast cancer. High risk patients identified by this method could thus be offered adjuvant medical treatment.
Assuntos
Neoplasias da Mama/metabolismo , DNA de Neoplasias/biossíntese , Adulto , Idoso , Idoso de 80 Anos ou mais , Neoplasias da Mama/mortalidade , Feminino , Humanos , Metástase Linfática , Pessoa de Meia-Idade , PrognósticoRESUMO
The effect of polyamine depletion on the radiosensitivity of a human tumor cell line was investigated. CAL 18 A cells, derived from a breast carcinoma, were incubated with alpha-difluoromethylornithine (DFMO)--a specific and irreversible inhibitor of ornithine decarboxylase (ODC)--at a 1 mM or 10-mM concentration for either 1 hr or 24 hr and irradiated thereafter. Survival curves of exponentially growing cells revealed a moderate but significant enhancement of radiosensitivity as compared to untreated irradiated cells. Maximum radiosensitization was observed at a concentration of 10 mM after 1 hr incubation. Plateau-phase cells were used to study the effect of polyamine inhibition on repair of radiation-induced potentially lethal damage (PLD). DFMO enhanced the radiation response and significantly inhibited PLD repair in these cells. Measurement of ODC indicated that this enzyme was markedly inactivated upon brief incubation of CAL 18 A cells with DFMO, reflecting a depletion of polyamine synthesis. These results extend findings that have demonstrated enhancement of drug-induced cytotoxicity, and raise the possibility of clinical use of this substance for potentiation of radiation response.
Assuntos
Neoplasias da Mama/radioterapia , Ornitina/análogos & derivados , Radiossensibilizantes , Neoplasias da Mama/metabolismo , Divisão Celular/efeitos da radiação , Linhagem Celular , Sobrevivência Celular/efeitos da radiação , Reparo do DNA/efeitos dos fármacos , Reparo do DNA/efeitos da radiação , DNA de Neoplasias/efeitos da radiação , Eflornitina , Humanos , Ornitina/farmacologia , Inibidores da Ornitina Descarboxilase , Poliaminas/biossínteseRESUMO
Once treated almost exclusively by radical surgery, locally advanced breast cancers (Stages III, IV; MO) were later treated solely by irradiation, but local results (cosmesis and recurrences) remained poor. Since 1977, we have used induction chemotherapy in an attempt to treat subclinical metastatic disease while allowing better quality mammary conservation in a greater number of patients. From 1977 to 1980, 25 patients (Stages III, IV; MO) were treated by a sequential association of chemotherapy (Adriamycin [doxorubicin], vincristine, cyclophosphamide, 5-fluorouracil; 3 cycles) followed by irradiation (45 Gy to the breast and nodal areas; 15-30 Gy mammary boost dose). Responses of 50% or more were observed in 86% of the breast lesions and in 80% of nodal lesions. This sequential treatment was always well tolerated. Local recurrences occurred in six patients (24%) who underwent mastectomy without any complications. The survival rate at 4 years is 55%.
Assuntos
Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Neoplasias da Mama/tratamento farmacológico , Neoplasias da Mama/radioterapia , Adulto , Idoso , Neoplasias da Mama/patologia , Terapia Combinada , Feminino , Humanos , Excisão de Linfonodo , Linfonodos/patologia , Mastectomia , Pessoa de Meia-Idade , Metástase Neoplásica , Recidiva Local de Neoplasia/cirurgia , Dosagem RadioterapêuticaRESUMO
The major goal of MEDICYC, the medical cyclotron programme of the Antoine-Lacassagne Cancer Center (Nice, France) is radiotherapy based on protons and fast neutrons. This cyclotron has also been designed to meet the medical requirements for the Center's Nuclear Medicine Department. Technical specifications and anticipated applications are discussed. The construction of the machine is nearly finished and a first axially injected beam is scheduled for early 1987.
Assuntos
Aceleradores de Partículas , Radioterapia de Alta Energia/instrumentação , Deutério , Desenho de Equipamento , Nêutrons Rápidos , França , Lítio , PrótonsRESUMO
Despite numerous studies, the histogenesis of Kaposi's sarcoma remains unclear. In connection with the culture of two Kaposi's sarcomas, the morphological, ultrastructural, and immunological properties of the various cell types observed are discussed. Cloning in agar, loss of contact inhibition, and karyotyping were used to determine which cells had undergone malignant transformation. Findings for both cases revealed that endothelial cells had undergone neoplastic transformation. Fibroblastic cell lines were isolated from both sarcoma fragments; although their growth characteristics distinguished them from normal fibroblasts (increased growth and possibility of culture in soft agar), cytogenetic investigations on both lines confirmed that they were genetically normal, and occurred along with malignant cells as a accessory compartment within lesions. Endothelial cells appear to be the sole origin of Kaposi's sarcoma, and may release factors which alter fibroblastic growth.
Assuntos
Transformação Celular Neoplásica/patologia , Sarcoma de Kaposi/patologia , Neoplasias Cutâneas/patologia , Idoso , Idoso de 80 Anos ou mais , Biópsia , Endotélio/patologia , Fibroblastos/patologia , Imunofluorescência , Humanos , Masculino , Microscopia Eletrônica , Pele/patologia , Ensaio Tumoral de Célula-TroncoRESUMO
The rationale for introducing fast neutrons in therapy initially was a reduction in the Oxygen Enhancement Ratio (OER). The recent radiobiological developments indicate that, more generally, fast neutrons tend to reduce the difference in radiosensitivity between cell lines, or related to the degree of oxygenation (Oxygen Gain Factor), the position of the cells in the mitotic cycle (Kinetics Gain Factor), etc. The reduction of the differences in radiosensitivity brings a benefit for certain types of tumours (normally resistant to photons), but a disadvantage for other types of tumours (those which can currently be controlled by photon treatment). A review of the available clinical data is presented. The tumour types or sites for which a benefit has been observed are discussed: locally advanced tumours of the salivary glands, paranasal sinuses, some tumours of the head and neck area with metastatic lymph nodes, slowly growing, well differentiated soft tissue sarcomas, inoperable/recurrent melanomas, locally extended (C, D1) prostatic adenocarcinomas. Selection of the patients suitable for neutron therapy remains the main problem. Collaboration between neutron therapy centres is essential to accelerate the acquisition of sufficient clinical data needed in order to improve patient selection, as well as the optimum modality of application of fast neutrons.
Assuntos
Nêutrons Rápidos , Neoplasias/radioterapia , Nêutrons , Transferência de Energia , Humanos , Hipóxia/fisiopatologia , Tolerância a Radiação , Dosagem RadioterapêuticaRESUMO
Reports have appeared in the literature regarding biological damage to human cells following exposure to diagnostic ultrasound. We have examined the effects of diagnostic ultrasound (Sonel 400, C.G.R.) on human cell lines established in our laboratory. We report here that exposure to diagnostic ultrasound, at maximum exposure intensity and at exposure time as long as 60 minutes, produces no cell lysis as determined by vital dye exclusion ability, and as confirmed by electron microscopy. However, the exposure to ultrasound produced by an apparatus delivering an acoustic power higher than the diagnostic levels (Sonoscope-Alcatel) can cause the complete lysis of the same cells.