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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of cancer research and clinical oncology 94 (1979), S. 29-37 
    ISSN: 1432-1335
    Keywords: Tumorzellproliferation ; Zytostatikum ; Wirkungsänderung ; Tumor cell proliferation ; Cytostatic drug ; Changing effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The aim of the present investigations was to study the effectiveness of a cytostatic drug (VCR) during different phases of tumor growth (1st, 7th, 14th day a.t.) and at the periphery and at the centre of the tumor (on the 14th day a.t.). Furthermore the inducement of a partial synchronization in the proliferation of tumor cells was attempted. It was found that the intensity of the cytostatic effect significantly decreased both with the passage of time after transplantation and within the tumor from the periphery to the centre. The changing cytostatic sensitivity probably is due to the diminishing vascular supply and the decreased rate of cell proliferation; especially the decline of the growth fraction. A partial synchronization of the proliferation of tumor cells could not be demonstrated.
    Notes: Zusammenfassung Das Ziel der vorliegenden Experimente war, die Effektivität eines Cytostatikums (VCR) während verschiedener Wachstumsphasen (1., 7., 14. Tag p.T.) eines soliden Tumors und vergleichend im Tumorrand und im Zentrum (am 14. Tag p.T.) zu untersuchen. Außerdem sollte geprüft werden, ob eine Teilsynchronisation der Tumorzellproliferation induziert werden könnte. Es ließ sich zeigen, daß die Intensität der Cytostatikawirkung zum einen mit der Zeit nach Tumortransplantation und zum anderen innerhalb des Tumors selbst vom Rand zum Zentrum signifikant abnahm. Die veränderte Cytostatikasensibilität dürfte auf die verschlechterte Gefäßversorgung und die verminderte Zellproliferation — vor allem auf die Abnahme der Wachstumsfraktion — zurückzuführen sein. Eine Teilsynchronisation des Wachstums der Tumorzellen konnte nicht nachgewiesen werden.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of cancer research and clinical oncology 96 (1980), S. 65-78 
    ISSN: 1432-1335
    Keywords: Ehrlich ascites tumor ; Proliferation kinetics ; Partial synchronization ; Combination chemotherapy ; Cytostatic drugs ; Adriamycin ; Hydroxyurea ; Vincristine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary This paper deals with experimental investigations concerning the composition of a cytostatic three-drug-protocol in diploid Ehrlich-Ascites-Tumor (EAT) cells in vivo at a far advanced stage of the disease. Hydroxyurea (HU) and vincristine (VCR) were used in very low doses to induce a modification of the growth pattern of tumor cells alike partial synchronization. Adriamycin (ADM) was selected as cytocidal drug during DNA synthesis of the partially synchronized cells. It was found that the sequential combination of HU and VCR (first HU and 12h thereafter VCR) caused the greatest alteration of growth pattern compared with other combination protocols. A further statistically significant increase of the degree of synchrony was observed after a second VCR administration—22 h after HU. By means of this protocol the EAT was subdivided into two proliferating subpopulations, a diploid and a tetraploid one. the tetraploid population resulted from surviving cells being not able to perform cytokinesis correctly, so that polynuclear cells and cells with a large single nucleus containing tetraploid DNA values were created. With respect to therapy, the administration of ADM at the time of DNA synthesis of the partially synchronized cells resulted in a statistically significant prolongation of the mean survival time and in 30% of cures of the animals. The dosage of ADM was 2.6 mg/kg, i.e., a nonlethal dose (50% of the LD10). Other combinations, i.e., simultaneous or reversed sequential combinations, did not show any therapeutic improvement compared to single drug therapy of ADM.
    Type of Medium: Electronic Resource
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