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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 61 (1983), S. 77-84 
    ISSN: 1432-1440
    Keywords: Chemotherapy ; Predicting tests
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In order to determine the pre-therapeutical effectiveness of cytotoxic drugs in metastasizing tumours, two in vitro test methods were examined for their predictive validity: the short-term incubation of tumour cells with cytotoxic drugs and radioactive labelled precursors of the DNA-or RNA-synthesis, and the testing of the cloning ability of tumour cells, pre-incubated with cytotoxic drugs. The short-term incubation techniques were directed in two directions: the testing of sensitivity and the testing of resistance. Both methods can only be carried out using strong proliferating tumours. With methodical, pharmalogical and biological problems, the sensitivity test results in a relatively minor correlation between the in vitro and in vivo reactions. Contrary to this the resistance test allows a predictive, clinically utilizable judgement of primary and secondary forms of the tumour-cell resistance of specific cytotoxic drugs. The consecutive measurement of the proliferative activity of tumours before and after a systematic chemotherapy also seems to be an able parameter concerning the clinically expected effectiveness of cytotoxic drugs. Compared to the other in vitro tests the tumour-cell clonogenic assay demonstrates two main advantages: firstly, all cytotoxic drugs can be analysed by this test method, and secondly, little proliferating tumours can also examined. Nevertheless, this test method seems to be more suitable for predicting tumour-cell resistance than the sensitivity of cytotoxic drugs.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 54 (1976), S. 349-355 
    ISSN: 1432-1440
    Keywords: In vitro test ; Cytostatic agents ; Resistance ; Human tumors ; In-vitro-Test ; Cytostatika ; Resistenz ; menschliche Tumoren
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Kurzzeitinkubation menschlichen Tumormaterials in vitro mit verschiedenen Cytostatika unter Zusatz der entsprechenden radioaktivmarkierten Stoffwechselpräkursoren zeigt mit hoher Sicherheit diejenigen Cytostatika auf, die gegenüber dem untersuchten Tumor wirkungslos sind. Durch prätherapeutische Kenntnis solcher Substanzen kann der Patient vor überflüssiger und zusätzlich schädigender cytostatischer Therapie bewahrt werden. Die In-vitro-in-vivo-Korrelation des Testsystems wurde an 3 verschiedenen Gruppen überprüft: 1. Tumor-Patienten die cytostatisch therapiert worden waren, deren Tumoren aber entweder primär therapieresistent waren oder aber nach anfänglicher Tumorrückbildung sekundär Resistenzen entwickelten: sämtliche Cytostatika, die zum Zeitpunkt der Testung klinisch keinen Einfluß auf das Tumorwachstum hatten, erwiesen sich auch im In-vitro-Test als wirkungslos. 2. Tumor-Patienten, die entgengen den In-vitro-Testergebnissen nach klinischen Therapieschemata behandelt worden waren: bei dieser Gruppe konnte, in Übereinstimmung mit dem Testergebnis, klinisch keine Beeinflußung des Tumorwachstums festgestellt werden. 3. Tumor-Patienten, die entsprechend den Ergebnissen der Tumorresistenztestung behandelt wurden. Aus den klinischen Therapieprogrammen wurden diejenigen Substanzen eliminiert, die sich im In-vitro-Test als resistent erwiesen hatten: in keinem Fall dieser Gruppe war es nach einem Beobachtungszeitraum von 8 Wochen zu einer Progression des Tumorwachstums gekommen.
    Notes: Summary An in vitro short term incubation of human tumors with different cytostatic agents and their corresponding radioactive precursors of cell metabolism allows detection of those drugs which are inefficacious on the examined tumor. The pretherapeutical knowledge of those substances keeps the patient from unnecessary and damaging cytotoxic treatment. The in vitro and in vivo correlation of this technique was tested on 3 different groups of tumor patients: 1. Chemotherapeutically treated tumor patients with primary or secondary induced resistance against the applied cytostatic agents: all substances which clinically did not influence the tumor growth at the moment of the test also were inefficient in the in vitro test system. 2. Tumor patients who were treated according to a clinical therapy regimen contrary to the results of the in vitro testing: corresponding to the test, no influence on tumor growth was seen. 3. Tumor patients who were treated according to the results of the resistance test: after 8 weeks observation none of these patients had any signs of tumor progression.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 57 (1979), S. 1191-1193 
    ISSN: 1432-1440
    Keywords: Hydroxyurea ; Human bone marrow ; Partial synchronization ; Hydroxyurea ; menschliches Knochenmark ; partielle Synchronisation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei vier an disseminierten Tumoren erkrankten Patienten mit morphologisch intaktem Knochenmark wurde eine perorale Hydroxyurea-Infusion (HU) in einer Konzentration von etwa 5×10−4 Mol über 10 h durchgeführt. Als Parameter der DNS-Synthese wurden die 3H-Thymidin-Einbauraten am durch Punktion gewonnenen Knochenmark vor, während und/oder nach HU-Behandlung gemessen. Die DNA-Synthese war während der HU-Applikation weitgehend inhibiert und stieg 14–16 h nach Absetzen des Medikaments um den Faktor 1,5 bis 2 des Ausgangswertes an. Als Erklärung dient eine partielle Synchronisation von Knochenmarkszellen, wobei Zelldepletions- und Recruitmenteffekte nicht sicher auszuschließen sind. Klinisch faßbare toxische Wirkungen wie Verminderung peripherer Blutzellen oder Unverträglichkeit traten nicht auf.
    Notes: Summary Four patients, who suffered from malignant, disseminated tumors but had a morphologically intact bone marrow, where given a peroral Hydroxyurea (HU) infusion in a concentration of about 5×10−4 mol over a period of 10 h. As indicator of the DNA synthesis the 3H-TdR-incorporation of bone marrow, gained by puncture before, during, and/or after HU application, was measured. While using HU, the DNA synthesis was extensively inhibited. Fourteen to 16 h after discontinuing the HU it increased by the factor 1.5 to 2 of the initial value, i.e., before treatment. This is interpreted as a partial synchronization of bone marrow cells where effects of cell depletion and recruitment are not to be entirely excluded, Toxicity, such as the decrease of peripheral blood cells or nausea, did not occur.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    The @Journal of Steroid Biochemistry and Molecular Biology 45 (1993), S. 315-319 
    ISSN: 0960-0760
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0022-4731
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0022-4731
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    British journal of dermatology 143 (2000), S. 0 
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1439-0973
    Keywords: Key WordsAbsidia corymbifera ; Mucormycosis ; Acute myeloid leukemia ; Neutropenia ; Vasculitis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary An 18-year-old woman was admitted to hospital because of subcutaneous hematoma and fever of unknown origin. Acute myeloid leukemia was diagnosed and empirical antimicrobial treatment and induction chemotherapy were started. After initial defervescence, fever relapsed 21 days after the onset of neutropenia. The CT scan of the lung was consistent with an invasive fungal infection. Treatment with amphotericin B was started and antimicrobial treatment was continued with liposomal amphotericin B because of an increase in creatinine later. The fever persisted and the patient suddenly developed progressive neurological symptoms. CT scan of the head suggested cerebral infarction and angiography of the extra- and intracranial arteries showed signs of vasculitis. Six days after the onset of neurological symptoms cerebral death was diagnosed. Autopsy revealed non-septate, irregularly branched hyphae in various histologic sections including brain. Absidia corymbifera could be isolated from lung tissue confirming the diagnosis of disseminated mucormycosis. In this case, angiographic findings suggested severe cerebral vasculitis which was in fact caused by thromboembolic dissemination of fungal hyphae. This case underlines the fact that cerebral symptoms in febrile neutropenic patients are highly indicative for fungal infections of the brain.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1432-2307
    Keywords: Hepatic veno-occlusive disease ; Renal transplantation ; Azathioprine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The paper presents the morphological findings and clinical data of 4 patients with veno-occlusive disease of the liver developing after immunosuppressive therapy with azathioprine and prednisolone. The pathogenesis and a possible causal relationship of hepatic veno-occlusive disease with long term azathioprine therapy are discussed.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Der Onkologe 2 (1996), S. 365-369 
    ISSN: 1433-0415
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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