Tumors from a large colony of over 2000 Sprague-Dawley rats were reviewed by a panel of pathologists under the auspices of Universities Associated for Research and Education in Pathology, In the course of this study, a distinct malignancy in 105 rats was segregated and given the name "histiocytic sarcoma." This report describes the histologic features and anatomic distribution of the tumor, along with its incidence by age and sex of the rat. The neoplasm is characterized by a spectrum of histologic patterns, one extreme resembling a sarcomatous process and the other a granulomatous process.
View Article and Find Full Text PDFMalignant mesotheliomas were induced in the rat peritoneum by a single injection of chrysotile or crocidolite asbestos fibers. The immediate toxicity of the fibers was noted in both groups of animals, producing approximately 40% mortality, within 8 days after the injection associated with acute peritonities. Tissue reactions to these two types of asbestos were significantly different.
View Article and Find Full Text PDFNatl Cancer Inst Monogr
July 1969