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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 733 (1994), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-1440
    Keywords: Glucagon ; Glucagonoma ; Octreotide ; Chromogranin A ; Preglucagon ; Preproglucagon ; Somatostatin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A 52-year-old female with metastatic glucagonoma secreting glucagon and chromogranin A was treated with the somatostatin analogue octreotide for 2 years without any additional tumor-reducing interventions. Before therapy plasma glucagon was above 8 μg/l (normal 〈0.2) and within 2 days 3 × 200 μg octreotide daily suppressed plasma glucagon to 2.2–2.5 μg/l. Concomitantly, chromogranin A dropped from 0.85 mg/l (normal 〈0.1) to 0.2. After 3 weeks the preexisting disabling necrolytic migratory erythema had vanished completely, and weight loss was temporarily stopped. During therapy chromogranin A and plasma glucagon rose, exceeding pretreatment levels after 3 and 14 months, respectively. After 1 year the erythema recurred, responding only transiently to increasing doses of octreotide. The patient died after 2 years of therapy of tumor cachexy despite very highdosesof octreotide (4 × 600 μg/day). Throughout treatment octreotide did not prevent tumor growth, as demonstrated by computed tomography and sonography. Determination of immunoreactive glucagon before and during octreotide therapy in fractions of plasma samples subjected to gel chromatography revealed a reduction in the ratio of glucagon to preproglucagon from 1.83 (before) to 0.56 (during therapy), indicating inhibition of posttranslational processing of preproglucagon by octreotide, thereby reducing circulating bioactive glucagon. In summary, octreotide induced a remission of clinical symptoms by inhibiting posttranslational conversion of preproglucagon to glucagon but did not prevent tumor growth. Therefore, octreotide is a valuable therapy for rapid relief of clinical symptoms, thereby improving the possibilities for other tumor-reducing therapies.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-2323
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Les résultats de la localisation de tumeurs insulaires du pancréas par l'administration intraveineuse de deux analogues marqués de la somatostatine, le 123 I-Tyr3-octréotide et le 11 Inoctréotide, ont été analysés chez 25 patients. Les tumeurs primitives et des métastases, souvent méconnues jusqu'alors, ont été visualisées chez 20 des 25 patients (80%). Parallèlement, la détectionin vitro des récepteurs de la somatostatine des tumeurs ainsi visualiséesin vivo sont en faveur d'une liaison à la tumeurin vivo, spécifique des récepteurs en question. La détection de ces récepteursin vivo était un facteur prédictif d'un effet suppressif sur l'hypersécrétion hormonale des tumeurs. Il s'agit d'un moyen d'investigation facile, rapide et sûr de localiser les tumeurs endocrines primitives du pancréas ainsi que leurs métastases, souvent encore cliniquement et radiologiquement muettes.
    Abstract: Resumen Presentamos los resultados de la visualización de tumores insulares en 25 pacientes luego de la administración intravenosa de dos análogos de la somatostatina marcados con radioisótopos (123I-Ty3-octreótido y 111 In-octreótido). Los tumores primarios, así como las metástasis distantes, frecuentemente desapercibidas, fueron visualizados en 20 de 25 pacientes (80%). La detección paralelain vitro de receptores de somatostatina en tales tumores, que tambión habían sido visualizadosin vivo, indica que la ligazónin vivo representa ligazón a receptores específicos de somatostatina. La detección de receptores de somatostatina en estos tumoresin vivo predijo un buen efecto supresor del octreótido sobre su hipersecreción hormonal. El procedimiento es sencillo, rápido, libre de peligro y muy valioso en la localización de los tumores endocrinos primarios del páncreas, así como de sus metástasis, que frecuentemente permanecen ocultas en los exámenes radiológicos y clínicos.
    Notes: Abstract The results of visualization of the islet cell tumors of 25 patients after intravenous administration of two isotope-labeled somatostatin analogs (123I-Tyr3-octreotide and111In-octreotide) are described. The primary tumors, as well as previously often unrecognized distant metastases were visualized in 20 of the 25 patients (80%). Parallel in vitro detection of somatostatin receptors on those tumors that had also been visualized in vivo indicates that the ligand binding to the tumor in vivo indeed represents binding to specific somatostatin receptors. The detection of somatostatin receptors on these tumors in vivo predicted a good suppressive effect of octreotide on hormonal hypersecretion by these tumors. It is an easy, quick, harmless procedure that is valuable for localization of primary endocrine pancreatic tumors and their often radiologically and clinically not yet recognized metastases.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0942-0940
    Keywords: Hypophysectomy ; optic chiasm ; optic nerve ; pituitary neoplasm ; sella turcica
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The effect of transsphenoidal hypophysectomy is presented in 60 patients with visual impairment due to a pituitary adenoma, derived from a total series of 194 patients. The preoperative visual acuity and visual fields were compared with those one year after operation. The visual field loss was estimated using a semi-quantitative method. Seventy-two eyes had diminished visual acuity, and this improved in 45 eyes (63%). Visual field loss was present in 102 eyes and this improved in 71 eyes (70%). Improvement of either visual acuity and/or visual field was found in 84 eyes (78%). In 16 patients (27%) vision became normal after operation. Improvement of the visual acuity was usually accompanied by an improvement in the visual fields.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 79 (1986), S. 42-47 
    ISSN: 0942-0940
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Results of experiments on the presence of steroid receptors in a series of 67 meningioma tissues, which were derived from 64 patients are presented. All tissues were studied using dextran-coated charcoal adsorption and Scatchard plot analysis. Progestin receptors were present in a high concentration in more than 80% of the specimens. Very low concentrations of an oestrogen binding agent were found in a limited number of samples. Thus, most meningiomas contain high levels of progestin receptors in the virtual absence of oestrogen receptors. Relations were not observed between progestin receptor-content and the age and sex of the patients, or the location and the histological type of the tumour. The role and action of progestin on meningiomas is still unknown. The presence of progestin receptors, however, suggests that meningioma may be regarded as a true target tissue for progestins.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-0533
    Keywords: Hormone secretion ; Human pituitary adenomas ; Cell culture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In 22 endocrinologically active hypophyseal adenomas the relationship between the biological behaviour and the cytological picture was investigated. There was a positive correlation between the atypia of the cells in the cytograms and hormone secretion of the tumour cells in vitro and the clinical aggressiveness. Cytological examination gave a better insight into the biological properties of these tumours than histological methods.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Surgical endoscopy and other interventional techniques 12 (1998), S. 412-415 
    ISSN: 1432-2218
    Keywords: Key words: Insulin-like growth factor — Laparoscopy — Bowel — Cancer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background: The role of laparoscopic surgery in the treatment of colorectal disease is still controversial. To assess the metabolic consequences of laparoscopic and open bowel surgery, we studied serum levels of insulin-like growth factor 1 (IGF-1), an anabolic and mitogeneic peptide, in rats. Materials and methods: In experiment 1, the serum IGF-1 levels of 10 rats undergoing laparoscopic small bowel resections (group I) and 10 rats undergoing conventional small bowel resections (group II) were determined before surgery and on days 1, 2, and 7. Experiment 2 compared five rats that had CO2 pneumoperitoneum (group III), five rats that underwent laparotomy (group IV), and five rats that received anesthesia only (group V). Differences in IGF-1 levels were tested with analysis of covariance. Results: In experiment 1, preoperative IGF-1 levels were similar in groups I and II (87.9 ± 6.1 nmol/L versus 90.5 ± 8.1 nmol/L). One day after surgery IGF-1 was 54.6 ± 10.5 in group I versus 41.6 ± 8.3 in group II (p= 0.006). Two days after surgery, IGF-1 was 79.4 ± 9.2 in group I versus 59.0 ± 10.5 in group II (p 〈 0.001). Seven days after both types of surgery, IGF-1 levels had returned to almost normal levels. In experiment 2, no significant differences were found between the rats with CO2 pneumoperitoneum (group III) and those with laparotomy only (group IV). Rats that had anaesthesia only showed a significant decrease in IGF-1 levels between days 0 and 1 (p 〈 0.018). Conclusion: Our study indicates that laparoscopic bowel surgery is associated with a better postoperative anabolic state (i.e., less catabolism) than conventional surgery. This finding reflects a potential benefit of laparoscopy in bowel surgery.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1573-7217
    Keywords: buserelin ; LHRH-agonists ; rat mammary tumor ; sandostatin ; somatostatin analogs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The effects of treatment with a somatostatin analog (Sandostatin, SMS201-995) were investigated in female rats with dimethylbenzanthracene(DMBA)-induced rat mammary tumors. A 3-week treatment was performed using sandostatin, the LHRH-agonist buserelin alone, or buserelin in combination with sandostatin. Twice daily sandostatin treatment was performed with dosages of 0.05 µg, 0.2 µg, 1 µg, 5 µg, and 20 µg. Buserelin was used in a 2 × 5 µg/day dosage. The combined results from six different experiments show that the various dosages of sandostatin caused no tumor growth inhibition. Somatostatin receptors could not be demonstrated in these mammary tumors. Sandostatin treatment by daily injections did not suppress levels of growth hormone, prolactin, or epidermal growth factor-like activities. Estrogen (ER) and progesterone (PgR) receptor contents of the mammary tumors were not changed. In contrast, buserelin treatment caused highly significant tumor remission. The combined treatment with sandostatin and buserelin did not alter the treatment results obtained after treatment with buserelin alone. In conclusion, sandostatin treatment in this tumor model had no direct growth inhibitory effect and did not cause an endocrine inhibition of mammary tumor growth. However, these results do not exclude antitumor effects in human breast cancer in view of the presence of somatostatin receptors in approximately 20–45% of human tumors, besides possible different endocrine effects.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Pharmacy world & science 16 (1994), S. 201-207 
    ISSN: 1573-739X
    Keywords: Adenoma ; Adverse effects ; Diagnosis ; Dopaminergic agents ; Hormone antagonists ; Ketoconazole ; Octreotide ; Pituitary diseases
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The treatment of almost all types of pituitary adenomas has changed considerably in recent years. New types of drugs as well as improved application forms of older drug therapies are now becoming more and more available for everyday treatment of patients with these relatively rare diseases. For the most frequently occurring pituitary adenomas the drugs of first choice are described, as well as other available treatments, their indications and efficacies. Also the main side-effects are described.
    Type of Medium: Electronic Resource
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