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
  • Rat  (5)
  • Cancer prevention  (2)
  • Chemotherapie  (2)
  • Ratte  (2)
  • 1
    ISSN: 1432-1335
    Keywords: Indomethacin ; Prostaglandin E2 ; N-nitrosomethylurea ; Rat large bowel cancer ; Cancer prevention
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Nonsteroid antiinflammatory drugs such as indomethacin may play an important role in preventing the development of chemically induced experimental carcinomas of various organs including the large bowel in rats and mice. This effect might correlate with an inhibition of prostaglandin (PG) synthesis by these drugs. Sprague-Dawley rats were given three intrarectal doses of 4 mg N-nitrosomethyl-urea (MNU) within week 1 to induce large-bowel carcinomas. The experimental groups of rats received a 0.001% aqueous solution of indomethacin ad libitum as drinking water for days 1–8 and/or a subcutaneous injection of 500 μg/kg body weight of PGE2 immediately before and 2 h after each MNU dose. They were then maintained on basal diet and plain tap water without further treatment. At autopsy at week 31, the tumor incidence and the mean number of tumors per rat were 90% and 1.7 in untreated rats, 67% and 0.8 in indomethacin-treated rats, and 79% and 1.2 in indomethacin+PGE2-treated rats, respectively. The data indicate that indomethacin reduced the number of large-bowel tumors, while pharmacologic doses of PGE2 failed to reestablish the anticarcinogenic activity of indomethacin. It was concluded that a tolerable therapeutic dose of indomethacin can reduce the carcinogenic activity of MNU in the large bowel.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of cancer research and clinical oncology 100 (1981), S. 239-246 
    ISSN: 1432-1335
    Keywords: Transplanted rat leukemia L 5222 ; Autochthonous rat leukemia ; Chemotherapy ; Transplantierte Rattenleukämie L 5222 ; Autochthone Rattenleukämie ; Chemotherapie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Der Effekt einer klinisch wirksamen Substanzkombination (Vincristin, Adriamycin, Cytosin-Arabinosid) gegenüber einer transplantierten akuten Rattenleukämie (L 5222) und gegenüber autochthonen akuten Rattenleukämien wird in einem nichttoxischen Dosisbereich verglichen. Die Ratten mit transplantierter Leukämie verstarben nach vier, ohne Unterbrechung gegebenen Therapiecyclen; Remissionen wurden nicht erreicht. Die gleiche Behandlung, die zusätzlich durch einwöchige therapiefreie Intervalle unterbrochen werden konnte, bewirkte bei allen Ratten mit autochthoner Leukämie eine komplette Remission. Das unterschiedliche Ansprechen beider Leukämieformen auf die Therapie wird in erster Linie auf Unterschiede in der Kinetik zurückgeführt. Die Vergleichbarkeit transplantierter und autochthoner Rattenleukämien mit der akuten Leukämie des Menschen wird diskutiert.
    Notes: Summary The effect of a clinically active drug combination (vincristine, adriamycin, cytosine arabinoside) against (1) a transplanted acute rat leukemia (L 5222) and (2) autochthonous acute rat leukemias is compared in a non-toxic dose range. After four therapy cycles without therapy-free intervals, the animals with transplanted leukemia died; remissions were not achieved. In all rats with autochthonous leukemia the same treatment that was additionally interrupted by therapy-free intervals of 1 week caused complete remissions. The different reactions of both leukemia types to this treatment are mainly due to their kinetic differences. The comparability of transplanted and autochthonous rat leukemias with human acute leukemia is discussed.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of cancer research and clinical oncology 101 (1981), S. 243-248 
    ISSN: 1432-1335
    Keywords: Autochthonous (primary) myeloid leukemia ; Chloroleukemia ; Rat ; Chemotherapy ; Autochthone (primäre) myeloische Leukämie ; Chloroleukämie ; Ratte ; Chemotherapie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary After injection of 15 mg/kg ethylnitrosourea (ENU) weekly for 15 weeks to adult male Wistar rats (total dose: 225 mg/kg) about 10% of the animals developed myeloid leukemias (chloroleukemias), which resemble the chronic myeloid leukemia in man (CML) (peripheral blood picture, tissue infiltration, chronic course as compared to immature-cell rat leukemias). Monotherapy with busulfan effected no remissions. The median survival time after daily treatment with busulfan was 29.5 days (range: 7–70); it was significantly shorter than that of untreated controls (median: 47.5 days, range: 22–81). After weekly application of 20 mg/kg and 50 mg/kg Cyclophosphamide the median survival time increase to 69.5 (range: 26–114) and 61.5 (range: 20–92) days, respectively. Rate and duration of remissions after repeated weekly single doses of cyclophosphamide were positively correlated with the increase in single dose; the high dose-intermittent treatment with 50 mg/kg CPA/week yielded complete remissions in all treated animals. Despite these remissions, however, no significant increase in survival time could be observed in comparison with untreated controls. The comparability of autochthonous chloroleukemias in the rat with human CML is discussed.
    Notes: Zusammenfassung Nach wöchentlicher Injektion von 15 mg/kg Äthylnitrosoharnstoffüber 15 Wochen in erwachsene männliche Wistar Ratten (Gesamtdosis: 225 mg/kg) entwickelten etwa 10% der Tiere Chloroleukämien, die eine auffallende Ähnlichkeit mit der chronischen myeloischen Leukämie (CML) des Menschen haben (peripheres Blutbild, Gewebsinfiltration, chronischer Verlauf beim Vergleich mit unreifzelligen Rattenleukämien). Eine Monotherapie mit Busulfan bewirkte keine Remissionen. Nach täglicher Behandlung mit Busulfan lag die mediane Überlebenszeit bei 29,5 Tagen (Spanne: 7–70 Tage) und war somit kürzer als die der unbehandelten Kontrolltiere (mediane Überlebenszeit: 47,5 Tage; Spanne: 22–81 Tage). Nach wöchentlicher Behandlung mit 20 mg/kg sowie mit 50 mg/kg Cyclophosphamid (CPA) stieg die mediane Überlebenszeit auf 69,5 (Spanne: 26–114) bzw. 61,5 (Spanne: 20–92) Tage an. Die Remissionsrate und die Remissionsdauer nach wöchentlich wiederholten Einzeldosen von Cyclophosphamid zeigten eine positive Korrelation zur Höhe der Einzeldosis; so bewirkte eine intermittierende Behandlung mit 50 mg/kg CPA/Woche bei allen behandelten Ratten eine komplette Remission. Trotz der Remissionen konnte jedoch kein signifikanter Anstieg der Überlebenszeit beim Vergleich mit den unbehandelten Kontrollen beobachtet werden. Die Vergleichbarkeit der autochthonen Chloroleukämie der Ratte mit der CML des Menschen wird diskutiert.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    ISSN: 1432-1335
    Keywords: Autochthonous primary neurogenic tumors ; Rat ; Transplacental induction ; Chemotherapy ; BCNU
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Autochthonous neurogenic tumors of the rat induced by transplacental application of ethylnitrosourea were used for the first time to study their suitability as tumor models for experimental chemotherapy. Of 189 transplacentally treated rats, 87% developed neurogenic tumors. After the initial clinical diagnosis of a neurogenic tumor, additional malignant tumors often occurred. The mean number of neurogenic tumors from 62 untreated control rats increased from 1.0 per rat at the time of randomization to 1.2 as revealed by autopsy and 1.5 tumors by histological examinations. Out of all neurogenic tumors, tumors of the brain were observed in 31%, tumors of cranial nerves in 36% (90% tumors of trigeminal nerve), tumors of spinal cord in 21%, and tumors of peripheral nerves in 10%. The median survival time until natural death of 62 control rats was 228 days. Rats with tumors of peripheral nerves lived shortest, followed by rats with tumors of cranial nerves, tumors of the spinal cord, and brain tumors. Brain tumors were mainly astrocytomas and oligodendrogliomas. The survival time of untreated rats from randomization to natural death was longest for those with brain tumors, followed by tumors of peripheral nerves, cranial nerves, and tumors of the spinal cord. There was great variation in survival time from a few days to more than 6 months. To study the responsiveness to chemotherapy, 62 rats received BCNU as a single intravenous dose of 9 and later 10 mg/kg. Sixty-two untreated control rats had a median survival time of 36 days (95% confidence interval 26–52 days), the treated rats 43.5 days (26–62 days) The difference was not statistically significant. BCNU produced a remission or a no change of neurologic symptoms in 60% (37 out of 62) in comparison to 39% (24 out of 62) in the control group (p〈0.05). The advantages and disadvantages of the present models are discussed. Due to methodical problems and the marginal response to BCNU, autochthonous neurogenic tumors of the rat are not suitable as models for chemotherapeutic studies.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of cancer research and clinical oncology 95 (1979), S. 83-86 
    ISSN: 1432-1335
    Keywords: 2-Chloroethylnitrosoureas ; Carcinogenesis ; Rat ; 2-Chloroethylnitrosoharnstoffe ; Carcinogenese ; Ratte
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Nach Heilung der akuten Rattenleukämie L 5222 bei 79 BD IX Ratten mit einmaligen Dosen von 1,3-bis(2-Chloroethyl)-1-nitrosoharnstoff (BCNU) oder 1-(2-Hydroxyethyl)-3-(2-Chloroethyl)-3-nitrosoharnstoff (Hydroxyethyl-CNU) entwickelten sich bei insgesamt 9 Tieren (∼ 11%) sekundäre Malignome.
    Notes: Summary After cure of rat leukemia L 5222 in 79 BD IX rats by single doses of 1,3-bis(2-chloroethyl)-1-nitrosourea (BCNU) or 1-(2-hydroxyethyl)-3-(2-chloroethyl)-3-nitrosourea (Hydroxyethyl-CNU) a total of 9 rats (11%) developed secondary malignomas.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Langenbeck's archives of surgery 339 (1975), S. 41-53 
    ISSN: 1435-2451
    Keywords: Cancer prevention ; Chemotherapeutic models ; Tasks of oncology ; Krebsprävention ; Chemotherapeutische Modelle ; Aufgaben der Onkologie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Als besonders vordringliche Aufgaben praxisnaher Krebsforschung werden herausgestellt 1. der multidisciplinäre Charakter der Onkologie, 2. die Notwendigkeit, mehr als bisher den krebskranken Menschen in den Mittelpunkt der Forschung zu stellen, 3. die Notwendigkeit, mit modernen Methoden der Genetik den Begriff der Disposition naturwissenschaftlich zu fassen, 4. Untersuchungen auf dem Gebiet der chemischen Carcinogenese zu intensivieren, da sich auf diesem Sektor am wahrscheinlichsten eine Prävention von Krebserkrankungen erreichen läßt und 5. die Erarbeitung praxisnaher experimenteller Modelle zum Studium chemotherapeutischer Möglichkeiten.
    Notes: Summary Particularly urgent tasks for practical cancer research are pointed out: (1) recognition of the multidisciplinary character of oncology, (2) placement of the cancer patient more than before in the focus of research, (3) the use of modern methods of genetics to specify the definition of a "disposition", (4) the intensification of investigations into the field of chemical carcinogenesis, since prevention of cancer diseases seems most likely in this sector, and (5) elaboration of practical experimental models for the study of chemotherapeutic possibilities.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    ISSN: 1435-2451
    Keywords: Hyperthermia ; Induced colonic carcinoma ; Rat ; Chemotherapy ; BCNU ; Ftorafur
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Hyperthermie zur Behandlung von Tumoren wird seit längerem in In-vitro- und In-vivo-Versuchen und auch in der Klinik in verschiedenen Anwendungsformen erprobt. Bei der Kombination von Hyperthermie mit Chemotherapie wird eine überadditive cytostatische Wirkung beschrieben. In einem klinisch orientierten, kontrolliert durchgeführten Tierversuch wurde an einem durch N-Nitrosoacetoxymethylmethylamin (AMMN) induzierten autochthonen Coloncarcinom bei Sprague-Dawley-Ratten eine lokale, moderate Hyperthermie (43,5°C, 3 × 60 min) und eine Kombinationsbehandlung von Hyperthermie und Polychemotherapie (BCNU und Ftorafur) durchgeführt unter endoskopischer Diagnosestellung und Verlaufskontrolle. Es konnte keine Überlebenszeitverlängerung durch die angewendeten Therapien und keine additive Wirkung der lokalen moderaten Hyperthermie in Kombination mit der Chemotherapie bei diesem „harten”, d. h. relativ chemotherapieresistenten, Tumormodell gesehen werden.
    Notes: Summary The use of hyperthermia for the treatment of tumors has been tested in in vitro and in vivo experiments as well as clinically for a long time. Combination of hyperthermia with chemotherapy was reported to result in overadditive cytostatic effects. In a clinically adapted, controlled animal experiment, local moderate hyperthermia (43.5°C, 3 × 60 min) alone and in combination with polychemotherapy (BCNU and Ftorafur) was used for the treatment of AMMN-(N-nitrosoacetoxymethyl-methylamine) induced autochthonous colonic carcinomas in Sprague-Dawley rats. Diagnosis and follow-up inspections were carried out endoscopically. The applied therapies did not result in prolonged survival times, nor was an additive effect seen after combined hyperthermia and chemotherapy in this “hard”, i. e. relatively chemotherapy-resistent, tumor model.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    ISSN: 1435-2451
    Keywords: Hyperthermia ; Yoshida sarcoma ; Chemotherapy ; BCNU ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Hyperthermie zur Cytostase von Malignomen ist in zahlreichen In-vitro- und In-vivo-Untersuchungen beschrieben worden. Die Kombination von Chemotherapie mit Hyperthermie soll zur Potenzierung der therapeutischen Wirkung führen. Ein Forschungsgegenstand ist der zeitliche Abstand zwischen beiden Therapiemodalitäten. Anhand eines Yoshida-ColonModells bei Sprague-Dawley-Ratten wurde eine lokale Hyperthermie (43°C, 60 min) im Abstand von 0, 3, 6, 9, 12 und 24 h nach einer Chemotherapie mit BCNU durchgeführt. Die Ergebnisse zeigten keine signifikante Steigerung der Heilungsrate durch die Hyperthermie. Angesichts unserer Ergebnisse sollten z.B. die mit groben Hoffnungen propagierten hyperthermen Peritoneallavagen erst im Tierexperiment einer kontrollierten Untersuchung unterzogen werden.
    Notes: Summary There are numerous reports on in vitro and in vivo investigations of hyperthermia for cytostasis of malignant tumors. Combination of chemotherapy and hyperthermia is to potentiate the therapeutic effect. The time interval between the two types of therapy was the main subject of the present investigation. Local hyperthermia (43°C, 60 min) following BCNU chemotherapy at intervals of 0, 3, 6, 9, 12, and 24 h, respectively, was studied in a colonic Yoshida sarcoma model in Sprague-Dawley rats. No significant increase in the curing rate resulted from hyperthermic treatment. The results suggest that the highly anticipated hyperthermic peritoneal lavages should be investigated in controlled animal experiments prior to clinical use.
    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...