Asian Pacific Journal of Cancer Prevention

  • 제15권16호
  • /
  • Pages.6721-6726
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  • 2014
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  • 1513-7368(pISSN)
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  • 2476-762X(eISSN)
아시아태평양암예방학회 (Asian Pacific Journal of Cancer Prevention)
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Correlation of Tumour Response with Starting Tumour Size and Dose of Tamoxifen in an N-Methyl-N-Nitrosourea (NMU)-Induced Rat Mammary Cancer Model

  • Yankuzo, Hassan Muhammad (Department of Chemical Pathology, School of Medical Sciences, Universiti Sains Malaysia) ;
  • Emilia, Sharifah Tuan Sheriff (Department of Pathology, School of Medical Sciences, Universiti Sains Malaysia) ;
  • Shaari, Rumaizi (Department of Surgery, Faculty of Veterinary Medicine, Universiti Malaysia Kelantan) ;
  • Yaacob, Nik Soriani (Department of Chemical Pathology, School of Medical Sciences, Universiti Sains Malaysia)
  • 발행 : 2014.08.30
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초록

Background: The aim of this preliminary study was to address variations of responses observed with different starting tumor sizes of 10 and 15 mm, and the effects of different doses of tamoxifen (TAM) on experimental rat mammary tumors. Materials and Methods: Thirty-five inbred female Sprague Dawley rats aged 43 days were administered with three weekly doses of N-methyl-N-nitrosourea (NMU) intraperitoneally (ip) at 50 mg/kg body weight. Animals were randomized (beginning from 10 mm tumor size) into four TAM-treated (50, 100, 200 and $500{\mu}g/day$) groups of six animals each, and another group (n=6) treated with TAM $100{\mu}g/day$ at starting tumour size of 15 mm. The animals were treated by oral gavage daily for 8 weeks before sacrifice. Results: Serum urea and creatinine, and overall physical tumor burden were significantly modulated in animals treated with variable doses of TAM compared to the untreated controls (n=5). Final body weight and tumor number were significantly different in the 10 mm-treated animals compared to those treated at 15 mm. There were no significant differences in histopathological features among all the groups. Conclusions: Our findings suggest the importance of standardizing tumour size and drug doses before initiation of treatment, particularly in the direct comparison of basic end-tumour physical parameters.

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