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S Emri

Publications and source records attributed to S Emri.

At least 37 records · Page 2Linked to original sources
PubMed1998

Association of tumor washout rates and accumulation of technetium-99m-MIBI with expression of P-glycoprotein in lung cancer.

UNLABELLED: In a prospective study, we correlated the washout rates of 99mTc-sestamibi (MIBI) and the degree of MIBI accumulation with the expression of P-glycoprotein (Pgp) in tumor tissues in a total of 46 patients with lung cancer. METHODS: All patients underwent early (30 min) and delayed (3 hr) MIBI imaging and bronchoscopic biopsy before initiation of chemo- or radiotherapy. The interval between biopsy and imaging varied between 2 and 10 days. All patients had radiologically detectable tumors. Immunohistochemical studies were performed on paraffin sections using a monoclonal antibody, JSB-1, developed against the internal epitope of Pgp. Normal tissue and tumor washout rates and tumor-to-background ratios were correlated with the level of Pgp expression. RESULTS: There was an inverse correlation between tumor-to-background ratios and the density of Pgp (p = 0.001), whereas there was no appreciable correlation between tumor washout rates of MIBI and the level of Pgp expression (p = 0.414). CONCLUSION: The current data strongly suggest that, although the reduced ability for the tumors to accumulate MIBI correlates well with the increased levels of Pgp expression, tumor washout rates of MIBI do not correlate with the density of Pgp in tumor tissues. Our results also warrant additional research for correlating immunohistological and imaging findings with messenger RNA levels determined by polymerase chain reaction and flow cytometry.

ATP Binding Cassette Transporter, Subfamily B, Mem↗
PubMed1998

Environmentally-induced malignant pleural mesothelioma and HLA distribution in Turkey.

SETTING: A large university hospital in Ankara, Turkey. OBJECTIVE: To investigate the potential links, if any, between the occurrence of malignant pleural mesothelioma (MPM) and the presence and distribution of human leukocyte antigens (HLA) in patients environmentally exposed to asbestos and erionite in rural Anatolia, Turkey. DESIGN: A case-control study design was used to compare the relative frequency and distribution of HLA among 31 MPM patients originating from the fibrous zeolite (erionite) and asbestos villages in central Anatolia, and two sets of controls. The cases represented all of the MPM cases diagnosed between 1995 and 1997 in our clinic at the Hacettepe University Hospital. One control group of 119 healthy individuals was drawn from Tuzköy, which has the largest population of three erionite villages, a very high prevalence of mesothelioma due to environmental exposure to erionite, and accounted for 16 of the MPM cases in the study. A second control group composed of 118 renal transplant donors was formed for external comparison. RESULTS: A significant relation was found with the HLA-B41 antigen in 19.4% of the patients compared to 0.8% of the Tuzköy inhabitants (odds ratio [OR] 28.3; 95% confidence interval [CI] 3.1-652.5) and 1.7% of the referent renal donor population (OR 13.9; 95% CI 2.3-106.7). The frequency of the HLA-B58 and -DR16 antigens was also observed to be significantly higher in patients with MPM compared to the two control groups. The odds ratios of MPM in those with HLA-B58 were 8.6 (95% CI 1.2-72.4) and 8.5 (95% CI 1.2-71.8), respectively, compared to those of the Tuzköy inhabitants and renal donors. CONCLUSION: The predictive role of the HLA antigens -B41, -B58 and -DR16 for MPM needs to be further investigated. This will help in screening the population at risk, and facilitate preventive measures such as family counselling and gene therapy.

Adult↗
PubMed1997

Assessment of the value of fibronectin as a tumour marker in malignant pleural mesothelioma.

Fibronectin concentrations both in plasma and pleural effusion were prospectively determined in 60 patients with exudative pleural effusions. Fibronectin concentrations in plasma and pleural fluid in 12 patients with infectious and exudative pleural effusions (mean +/- SD) were 240 +/- 103 and 212 +/- 115 micrograms.mL-1, in 17 patients with primary or metastatic lung carcinoma 242 +/- 104 and 210 +/- 82 micrograms.mL-1, in 13 patients with pleural tuberculosis 246 +/- 77 and 231 +/- 133 micrograms.mL-1, and in 18 patients with confirmed malignant pleural mesothelioma 261 +/- 119 and 276 +/- 188 micrograms.mL-1. There were no significant differences either in the plasma or serum concentrations of fibronectin between groups (p > 0.05). Although pleural fluid fibronectin content appeared to have high specificity (85%), it was found to be an inefficient biological marker for differentiating nonmalignant from malignant pleural effusions due to its low sensitivity (6%).

Adult↗
PubMed1996

Fibrinolytic system in plasma and pleural fluid in malignant pleural mesothelioma.

The two major fibrinolytic activators, urokinase-type plasminogen activator (u-PA) and tissue-type plasminogen activator (t-PA) may play role in tumor spread and metastasis. Malign pleural mesothelioma (MPM) is a kind of tumor with predominantly local invasion and low incidence of distant metastasis. In this study, u-PA, t-PA and PA activator-1 (PAI-1) antigen and activity were measured in plasma and pleural fluid samples from patients with MPM, lung cancer and benign effusion. When compared to the control group, in MPM group, plasma u-PA and t-PA antigen levels were higher, but plasma u-PA and t-PA activity were comparable. PAI-1 antigen was also higher in MPM group. These findings were in contrast to the lung cancer group, in which both activity and immunologic measurement of u-PA and t-PA were higher, but PAI-1 antigen was similar as compared to the control group. It is concluded that excess t-PA and u-PA are balanced in complexes with PAI-1 in MPM, whereas the amount of PAI-1 in plasma is insufficient to overcome the elevated t-PA and u-PA, in lung cancer. Based on these findings, it may be suggested that the balanced fibrinolytic system is responsible for the low incidence of distant metastasis in MPM.

Adult↗
PubMed1996

Fibrinogen promotes adhesion of monocytic to human mesothelioma cells.

Adhesion between monocytic and mesothelioma or pleural mesothelial cells influences stromal remodeling in pleural neoplasia. We found that cultured monocytic cells (U937) adhere to either human pleural mesothelioma (MS-1) or mesothelial (MeT5A) cells in vitro. 125I-fibrinogen bound specifically and saturably to either cell line, and specific fibrinogen binding increased upon stimulation of these cells with proinflammatory agents such as phorbol myristate (PMA), lipopolysaccharide (LPS) or tumor necrosis factor (TNF-alpha). We purified the fibrinogen receptor protein from a membrane fraction of MS-1 cells and identified it by immunoprecipitation as intercellular adhesion molecule (ICAM-1). Anti-ICAM-1 antibody or antisense oligonucleotides inhibited fibrinogen-mediated cell adhesion and binding of 125I-fibrinogen to mesothelioma or mesothelial cells. Cultured monocytic cells adhere to either mesothelioma or mesothelial cells, and the interaction is promoted by fibrinogen binding ICAM-1 at the cell surface. ICAM-1 is expressed by mesothelioma cells and CD 11b by macrophages in the fibrinous mesothelioma tumor stroma. The data suggest a common mechanism by which monocytic cells could adhere to either malignant mesothelioma cells or the mesothelial surface in pleural neoplasia.

Binding Sites↗
PubMed1995

Carbon monoxide poisoning related to the use of steam coal in poorly ventilated bucket stoves.

During the years 1986 to 1990, an increasing number of cases of acute carbon monoxide (CO) poisoning were encountered in the Emergency Department Hacettepe University Hospital in Ankara, Turkey. Between January 1 and March 31, 1991, all the patients presenting with complaints compatible with CO poisoning were evaluated; the diagnosis was confirmed in 55 of the 5795 people who attended the Emergency Department during this period. In all cases the source of CO intoxication was determined. Among these patients, nausea or vomiting and headaches were the most common complaints (occurring in 100% and 85%, respectively). At least transient impairment of alertness was observed in 29% of cases. The carboxyhaemoglobin levels ranged from 3.80 to 48.1% (median 14.2%). Two comatose patients who developed a non-cardiogenic pulmonary oedema required mechanical ventilation. One of them was discharged from the hospital with mild cerebral disability. Another patient developed an acute myocardial infarction. In all the cases in this series, the source of CO poisoning was identified as improper combustion of recently marketed steam coal in inadequately ventilated bucket stoves.

Accidents, Home↗
PubMed1995

Regulation of fibrin deposition by malignant mesothelioma.

Malignant mesothelioma (MM) is a locally aggressive tumor that spreads by poorly understood mechanisms. Because neoplastic spread has been linked to altered fibrin turnover, we used immunohistochemistry of nine MM and three fibrous tumors of the pleura to confirm in vivo fibrin deposition and expression of selected coagulation and fibrinolytic reactants in MM. Tumor-associated fibrin was readily detectable at site of tissue invasion. Little fibrin was distributed within the tumor, but tissue factor and tissue factor pathway inhibitor, urokinase, urokinase receptor, and plasminogen activator inhibitors 1 and 2 were all detected in either epithelioid or sarcomatous areas of MM. We used the MS-1 human pleural mesothelioma cell line to determine how expression of these reactants is regulated. Fibrinolytic activity of MS-1 is mainly due to urokinase and is responsive to cytokine stimulation. Functional extrinsic activation and prothrombinase complexes assemble at the cell surface. MM express procoagulants as well as fibrinolytic reactants in vivo and in vitro that promote local fibrin formation and remodeling. Fibrin deposition occurs primarily at areas of tissue invasion and could promote local extension of this neoplasm. Sparsity of fibrin within the central portions of the tumor stroma suggests that local resorption of transitional fibrin occurs at sites of established MM.

Blood Coagulation↗
PubMed1994

Environmental asbestosis complicated by lung cancer.

Diagnosis of asbestosis and bronchiolo-alveolar carcinoma was made in a 55-year-old Turkish woman who was a nonsmoker. She originated from and was living in an area with a high prevalence of environmental diseases attributed to tremolite asbestos. Mineralogic analysis of lung tissue revealed very high concentrations of asbestos bodies (1.64 x 10(6)/g of dry tissue) and tremolite fibers (173.7 x 10(6) of dry tissue). This case illustrates the following points: (1) In some areas, environmental exposure can lead to cumulated fiber retention comparable to occupational exposure and thus can represent a risk for lung fibrosis (asbestosis). (2) Lung cancer as a complication of environmental asbestosis also should be considered as a potential environmental disease.

Adenocarcinoma, Bronchiolo-Alveolar↗
PubMed1993

Malignant pleural mesothelioma caused by environmental exposure to asbestos or erionite in rural Turkey: CT findings in 84 patients.

OBJECTIVE: Malignant pleural mesothelioma in rural Turkey frequently results from environmental exposure to tremolite asbestos or fibrous zeolite (erionite). The aim of this study was to determine the CT features of malignant pleural mesothelioma in patients exposed to asbestos or erionite. MATERIALS AND METHODS: The CT scans of 84 patients with proved malignant pleural mesothelioma were retrospectively evaluated. Twenty patients (24%) had been exposed to erionite and 64 patients (76%) had been exposed to asbestos. The CT scans were interpreted by seven observers who did not know the clinical or pathologic findings. RESULTS: CT scans showed either unilateral pleural thickening or pleural nodules/masses in all patients. Pleural nodules were present in 25 patients (30%) and pleural masses in 44 patients (52%). Pleural effusion was found in 61 patients (73%), mediastinal pleural involvement in 78 (93%), pleural calcifications in 52 (62%), involvement of the interlobar fissures in 64 (76%), and volume contraction in 61 (73%). Reduced size of the hemithorax was significantly correlated with chest wall involvement. On the basis of CT findings, the preassigned staging was changed in 21 patients (25%), including 44% of the patients with disease that had been classified as stage I. CT findings were not significantly different between the patients exposed to erionite and those exposed to asbestos. CONCLUSION: The most common CT findings in cases of malignant pleural mesothelioma were unilateral pleural thickening or pleural nodules/masses with or without effusion. CT provided valuable information on the extent of the disease, which was important for staging. Although the CT features are not pathognomonic, they provide valuable clues to the diagnosis in patients who have been exposed to mineral fibers.

Adult↗
PubMed1992

Malignant pleural mesothelioma due to environmental mineral fiber exposure in Turkey. Analysis of 135 cases.

We reviewed data from 135 patients with environment-associated malignant pleural mesothelioma (MPM) from the Central Anatolian region of Turkey. The most significant factors suggesting the diagnosis of MPM were the village where the patient resided and the typical presenting symptoms and signs of unilateral exudative pleural effusion associated with nonpleuritic chest pain. Computed tomography and ultrasonography were very useful for evaluating the extension of the tumor in the thoracic and abdominal cavities and chest wall. The tissue diagnosis was established by either thoracoscopy (39 percent) or pleural biopsy (39 percent) in the majority of the cases. The median survival after diagnosis was 13.52 months for erionite-associated MPM and 21.56 months for asbestos-associated MPM. The actuarial survival curves for the fibrous minerals were significantly different for survival computed both from onset of the symptoms and after diagnosis. Medical or surgical treatment or both did not change the outcome of the disease.

Actuarial Analysis↗
PubMed1989

The expanding spectrum of a disease. Behçet's disease associated with amyloidosis.

In this report, we present a series of 6 patients with Behçet's disease (BD) associated with amyloidosis whose illnesses date back at least 4 years. In all the cases, nephrotic syndrome heralded the onset of amyloidosis, which was diagnosed by percutaneous kidney biopsies. After the diagnosis of amyloidosis, all subjects received colchicine, and steroids were discontinued. Three patients have benefited from treatment. It was suggested that amyloidosis may be an intrinsic feature of BD or that the suppurative lesions may play a role in the accumulation of amyloid in the tissues. The literature was reviewed and discussed.

Adult↗
PubMed1988

Spontaneous perirenal haematoma secondary to polyarteritis nodosa.

Spontaneous perirenal haematoma (SPH) is an unusual but serious complication of polyarteritis nodosa (PAN). We present 3 patients with PAN-associated SPH. One was diagnosed pre-operatively and underwent emergency nephrectomy in order to stop the persistent bleeding; the second patient had surgical drainage of the haematoma and the third recovered without undergoing surgery. The diagnosis is discussed.

Adult↗