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The dose-response relationship in male F344 rats was determined for the ability of aspirin administered in the diet to prevent azoxymethane (AOM)-induced colon cancer and aberrant crypt foci (ACF) and to reduce prostaglandin E2 (PGE2) levels. Starting at either 7 or 22 weeks of age, the rats received aspirin. All rats received two doses of AOM (15 mg/kg(More)
F344 rats fed diets containing phenethyl isothiocyanate (PEITC, 3 mumol/g diet), a cruciferous vegetable component, before and during treatment with the tobacco-specific carcinogen 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK), developed about 50% fewer lung tumors than NNK-treated rats fed control diets. NNK-induced liver and nasal cavity tumors in(More)
This study was undertaken to determine the ability of a series of 19 compounds representing different chemical classes of carcinogens to induce lung tumors in strain A/J mice after either ip or po administration. Aflatoxin B1, dibutylnitrosamine, 1,2-dimethylhydrazine, and methylnitrosourea induced a significant increase in the lung tumor response in both(More)
The effect of biofeedback-assisted relaxation on cell-mediated immunity, cortisol, and white blood cell count was investigated in healthy adults under low-stress conditions. Fourteen subjects were trained with biofeedback-assisted relaxation for 4 weeks, while 17 subjects were controls. The group trained in relaxation techniques showed increased(More)
C57B1/6 mice were given intravenous tumor cells on day O. Mice were then given either a brief exposure to halothane anesthesia or given halothane and then underwent a hind limb amputation. Immune testing was done at varying time intervals and correlated with the development of artificial pulmonary metastases. The effects of a single 15 minute exposure to(More)
Chloroform, dichloroacetic acid (DCA) and trichloroacetic acid (TCA) are mouse liver carcinogens that are chlorine disinfection by-products found in drinking water. The effect of chloroform on DCA and TCA-induced hypomethylation and expression of the c-myc gene and on their promotion of liver and kidney tumors was determined. B6C3F1 mice were administered(More)
A spontaneous murine metastatic tumor system was used as a model to assess the effects of a major surgical procedure on tumor-specific immune reactivity and the growth of micrometastases. Any major surgical procedure resulted in impaired cell-mediated cytotoxicity postoperatively and an increase in the number of gross pulmonary metastases. The use of an(More)
Human ovarian cancer is predominantly of epithelial cell origin (>90% of malignant tumors) and most often presents at an advanced stage with poor prognosis. Most animal models of ovarian carcinoma yield thecal/granulosa cell tumors, rather than adenocarcinomas. Induction of adenocarcinoma in 10-45% of rats following an ovarian implantation of(More)
In order to provide a method for estimation of regional blood flow during hyperthermia, a mathematical model has been developed which employs thermal clearance to measure this physiologic parameter. Limbs of mongrel dogs were heated with 2450 megaHertz microwaves to temperatures of 43 degrees C, 45 degrees C, or 47 degrees C and thermal washout was measured(More)
We have confirmed previous results which suggest that transplacental exposure of fetal mice to carcinogens does not cause an increase in tumor incidence as they mature unless treatment occurs after midorganogenesis. In C3HeB/FeJ mice we found a negligible increase in tumor incidence and multiplicity following transplacental exposure to the direct-acting(More)