Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 2000-2004  (1)
  • 1965-1969  (3)
  • 1960-1964
  • Life and Medical Sciences  (2)
  • Polymer and Materials Science  (1)
  • Risikofaktoren  (1)
  • 1
    ISSN: 1433-0423
    Keywords: Schlüsselwörter Mammakarzinommetastase ; Maligner intraokulare Tumor ; Inzidenz ; Risikofaktoren ; Frühzeitige Therapie ; Key words Breast Cancer Metastasis ; Intraocular Tumor ; Incidence ; Risk Factors ; Early Treatment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Background: The breast cancer metastasis is the most common intraocular tumor in females. Aim of this study was to determine incidence and risk factors for intraocular metastasis and to evaluate the benefit of an early treatment. Patients and Methods: 151 patients suffering from metastastic breast cancer were screened for the presence of intraocular metastasis. The medical history and the tumor status at the time of screening were evaluated and risk factors for intraocular metastasis were determined. In case of choroidal metastasis external beam radiotherapy was performed. Results: Intraocular metastasis was found in 7 out of 151 patients screened (4.6%). In one patient metastasis was located in the iris, in 6 patients in the choroid. Intraocular metastasis was only found in patients with more than one other organ system involved into disease (p=0.002). In this subgroup of patients (n=65) prevalence of intraocular metastasis was 10,8%. Other risk factors for intraocular metastasis were presence of lung metastasis or brain metastasis. In 5 out 6 patients with choroidal metastasis external beam radiotherapy was performed, resulting in durable regression of metastasis and stabilization or improvement of visual acuity. Conclusion: The prevalence of intraocular metastasis in metastatic breast cancer was determined to be 4.6%. It is most commonly located in the choroid and develops in the course of advanced metastastic disease. Since early external beam radiotherapy of choroidal metastasis prevents functional loss, patients at risk should be given an ophthalmological screening for intraocular metastasis.
    Notes: Zusammenfassung Hintergrund: Die Mammakarzinommetastase ist der häufigste maligne intraokulare Tumor der Frau. Ziel der Untersuchung war die Bestimmung der Inzidenz, die Identifizierung von Risikofaktoren bezüglich des Auftretens sowie die Bewertung des Nutzens einer frühzeitigen Therapie dieser zunächst überwiegend asymptomatischen Tumormanifestation. Patienten und Methode: 151 Patientinnen mit metastasiertem Mammakarzinom wurden auf das Vorliegen intraokularer Metastasen untersucht. Die Tumoranamnese sowie der Tumorstatus zum Untersuchungszeitpunkt wurden erfasst um Risikofaktoren für eine intraokulare Metastasierung zu bestimmen sowie die Inzidenz derselben zu berechnen. Im Falle einer Aderhautmetastasierung wurde eine perkutane Strahlentherapie durchgeführt. Ergebnisse: Bei 7 von 151 untersuchten Patientinnen (4,6%) wurde eine intraokulare Metastasierung gefunden. In einem Fall bestand eine Irismetastase, bei 6 Patientinnen bestanden Aderhautmetastasen. Nur bei Patientinnen, bei denen mehr als ein Organsystem von einer Metastasierung betroffen war, fanden sich intraokulare Metastasen (p=0,002). In dieser Untergruppe der Patientinnen mit mehr als einem betroffenen Organsystem (n=65) betrug die Prävalenz der intraokularen Metastasierung 10,8%. Als weitere Risikofaktoren für das Auftreten intraokularer Metastasen konnten das Vorhandensein von Lungen- sowie von Hirnmetastasen identifiziert werden. Die bei 5 der 6 Patientinnen mit Aderhautmetastasierung durchgeführte perkutane Strahlentherapie führte zu einer Regression der Metastasen und zu einer dauerhaften Stabilisierung oder Besserung des Visus. Schlussfolgerung: Die Prävalenz der intraokularen Metastasierung beim metastasierten Mammakarzinom konnte mit 4,6% bestimmt werden. Sie betrifft meistens die Aderhaut und tritt im Rahmen einer Metastasierung in multiple Organsysteme auf. Da eine frühzeitige perkutane Strahlentherapie einen Funktionsverlust verhindert, sollten bei Risikopatienten gezielte ophthalmologische Untersuchungen erfolgen.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 0002-9106
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Testes of sexually mature, as well as newborn and young mice of varying ages were studied by electron microscopy. The seminiferous tubules in the mature mouse possess a single cell layer of extremely flattened cells which form a sheath-like structure around the epithelium of the tubule. These peritubular cells are characterized by cytoplasmic filaments and other features which are typical of smooth muscle cells. A basement lamina is associated with the interstitial or peripheral surface of the cell. Peripherally, there is an additional cellular layer consisting of connective tissue fibrocytes.In newborn animals, the cells surrounding the tubule epithelium consist of a homogeneous population of fibroblasts, 3-4 layers in thickness. With growth and development of the testes the number of cell layers is reduced and the cells become more attenuated. At 13 days, those cells which are closest to the epithelium show localized aggregates of fine filaments, as well as what appears to be the elaboration of a basement lamina. By 17 days, the cytoplasmic filaments are more numerous and the basement lamina is well defined: by 19 days, the cells closely resemble the peritubular muscle cells of the adult.The probable functional role of these cells is discussed with respect to both sperm transport and the production and maintenance of the surrounding connective tissue stroma.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Since Euglena gracilis Klebs var. bacillaris Pringsheim contains a species of DNA unique to the chloroplast, an important question concerns the extent to which light unblocks the reading of the organelle's template to provide the informational RNA's necessary to construct the plastid proteins. Experiments with 32Pi labeling of chloroplast and nonchloroplast RNA's during light-induced chloroplast development show that both the RNA of the chloroplast and of the rest of the cell become labeled during this process, with the chloroplast RNA's displaying the higher specific activity. The fact that chloroplast RNA is not uniquely labeled indicates that process other than a simple reading of the chloroplast DNA are involved. If we are to preserve the concept of a reasonable degree of chloroplast informational autonomy, we may assume, from this and other data, that the light induction of chloroplast development involves not only the unblocking of chloroplast DNA to make information available, but also a concomitant unblocking of other sites of informational RNA synthesis (e.g., nuclear and mitochondrial DNA's). Such sites external to the developing chloroplast may be concerned with making available the building blocks and energy necessary for the synthesis of chloroplast constituents coded for by the chloroplast DNA. This model leads to the prediction that photosynthesis could be gratuitous for chloroplast development if these nonchloroplast sites were providing most of the building blocks and energy. Experiments are reported which show that chloroplast formation and the acquisition of photosynthetic competence can be achieved under conditions where photosynthesis is completely inhibited for the entire span of development by using the highly selective inhibitor 3, (3,4-dichlorophenyl) 1, 1-dimethyl urea (DCMU), in agreement with the proposed model. The fact that more than just the chloroplast responds to the inducing signals for chloroplast differentiation raises the problem of experimental measurement of interaction among cellular organelles. Since chloroplast development is usually carried out in resting cells to avoid complications due to cell division, we discuss the limitations imposed by turnover in such nondividing systems and present evidence that most of the RNA labeling observed, although actinomycin-D-sensitive, is due to turnover and/or the utilization of preexisting pools. Evidence obtained with mutants of Euglena that form only partial chloroplasts or that lack plastid DNA and plastid-related structures is reported. Such evidence indicates that the functional proplastid restrains overall RNA labeling in the uninduced cells and suggests that the proplastid might be the source of regulatory metabolic signals in the normal plastid-containing cells.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 6 (1968), S. 233-240 
    ISSN: 0449-2986
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...