Failure of intracerebral BCG cell wall preparation to prevent glioma induction by avian sarcoma virus in rats

A controlled study of efficacy of interstitial or external irradiation in a virus-induced brain-tumor model in rats

In a controlled study of interstitial radiotherapy in the avian sarcoma virus (ASV)-induced glioma model in rats, prolongation of survival was demonstrated (p = 0.08 in Experiment 1 and p = 0.03 in Experiment 2) following mean dosages of 7582 to 9902 cGy 125I, when compared to nontreatment or to control studies with implantation of nonradioactive seeds. More significant (p = 0.02) prolongation of survival was demonstrated following external beam whole-head radiotherapy with nine fractions of 333 cGy, three times weekly over 3 weeks (total dose 3000 cGy). Survival was more prolonged when whole-head radiotherapy was begun 35 days following virus inoculation rather than at 71 days, probably reflecting a greater efficacy with smaller tumor targets.

Treatment of autochthonous rat brain tumors with steroid plus heparin: a brief report

Treatment of rats bearing intracranial gliomas induced by the avian sarcoma virus with heparin plus steroid has failed to effectively extend survival time.

Prevention of glioma induction in rats by simultaneous intracerebral inoculation of avian sarcoma virus plus bacillus Calmette-Guerin cell-wall preparation

Bacillus Calmette-Guerin cell-wall preparation was injected along with avian sarcoma virus in the brains of newborn Fischer 344 rats, and subsequent glioma induction was compared with rats injected with avian sarcoma virus alone. The percentage of glioma induction and survival were found to be directly related to avian sarcoma virus concentration (10(0), 10(-1), 10(-2), and 10(-3)). A significant reduction in glioma induction occurred when BCG cell-wall preparation was injected with 10(-2) ASV concentration. Above that concentration of ASV, the tumor induction was not significantly affected by bacillus Calmette-Guerin cell-wall preparation; below that concentration, the tumor induction was too low with avian sarcoma virus alone to evaluate an effect.

A study of reactions to Corynebacterium parvum (C. parvum) in the brain and dermis of the rat

A comparative analysis was made of the histological changes caused by Corynebacterium Parvum (C. parvum) infected into the brain and dermis of normal and C. parvum presensitized rats. Control rats were injected with saline. It was shown that for approximately 3 days after the intracerebral injection the brain reacted with a polymorphonuclear cell infiltration. This reaction was replaced in order by lymphocytes, macrophages, and finally by epithelioid cells progressing to granuloma. The histological changes were similar but more intense in the dermis than in the brain. Lymphocytes reached a peak by day 7, macrophages by day 3, and epithelioid cells by day 18. In comparison to the dermis, the cellular infiltration in the brain is more delayed, less intense and of longer duration. Intracerebral saline induced a moderate lymphocytic infiltrate, and in C. parvum presensitized rats a more intense macrophagic response. It is concluded that the brain of the rat, especially in presensitized animal, mounts an inflammatory response to C. parvum which is morphologically similar to that seen in the skin.